Toggle Solos

README.md

@@ -11,7 +11,7 @@ The catalog stores shared, immutable menu metadata. Complete score bundles stay
 
 Device controls:
 
-On the Zero, tap menu rows and switches directly; Tempo has minus/plus buttons. The main menu offers **Performance** and **Settings**.
+On the Zero, tap menu rows and switches directly; Tempo has minus/plus buttons. The main menu offers **Performance** and **Settings**. **Settings → Solos** switches both guitar parts between written solos (On) and beat slashes for improvisation (Off), including any solo pickup. Chord symbols and the rest of the arrangement stay in place. Solos starts On and remembers your choice until the app restarts; it applies when you next open a part on either device.
 
 On the Pico (and on the Zero while viewing a score):
 
@@ -116,7 +116,7 @@ Each song has six canonical roles: electric melody, electric accompaniment, elec
 
 Training, authored score reuse, and prediction share contextual harmony validation based on actual notes, timing, and chords. Explanatory labels and justification tags are not required. Unsupported relationships fail with a diagnostic rather than silently changing notes. Both solo roles use strings 1–6 and frets 1–12 without open strings. No dynamics, accents, velocity shaping, or random timing are added.
 
-`./modulus.py python -m generator.compose --song ... --role acoustic_solo --data-dir data --output ...` builds one independent role as JSON. To exercise prediction for a registered song, pass `--settings` with a JSON file containing `{"predict": true}`. Solos are included in the normal arranged scores and pages; separate solo MusicXML files are not generated. Authored XMLs remain under `data/training`, and regression tests compare their sounding events directly with generated score data.
+`./modulus.py python -m generator.compose --song ... --role acoustic_solo --data-dir data --output ...` builds one independent role as JSON. To exercise prediction for a registered song, pass `--settings` with a JSON file containing `{"predict": true}`. Each song produces five score bundles: the normal acoustic, electric and vocal parts, plus acoustic and electric `_improv` variants. The variants reuse the same accompaniment and melody, replacing the full solo allocation (including pickup rests) with meter-aware slashes in notation and TAB. Their subtitles identify them as Improvisation. Normal scores retain written solos; separate solo MusicXML files are not generated. Authored XMLs remain under `data/training`, and regression tests compare their sounding events directly with generated score data.
 
 See [Shared Part Generation](TECHNICAL_GUIDE.md#shared-part-generation) and [Authored Repertoire and Learned Solos](TECHNICAL_GUIDE.md#authored-repertoire-and-learned-solos) for the active pipeline and limitations. Keep temporary comparisons and one-off diagnostics under `/tmp/`; `build/` retains product outputs, tools and dependencies.
 
@@ -170,7 +170,7 @@ See [Score Generation](TECHNICAL_GUIDE.md#score-generation) for supported MusicX
 
 Build-time engraving is implemented in Python in `generator/engraving`, using the bundled Petaluma OTF fonts and SMuFL metadata. MuseScore is an optional authoring tool, not a build dependency or rendering backend. Configure installs the optional Modulus asset dependencies. Exact musical timing is retained through layout, with line breaks between complete measures. Missing glyphs, unrepresentable page geometry, and failed notation audits stop generation before replacing existing assets.
 
-Every normal build also writes printable PDFs to `build/<target>/generated_assets/print/`: one complete acoustic, electric and vocal part per song, including every arranged iteration and the ending. Print at actual size on portrait US Letter paper. Pages have white backgrounds, black notation, at least half-inch printer margins, and multiple systems per sheet; guitar parts include TAB. These are fresh 300 DPI renders, without the duplicated lines used by playback transition pages. PDFs use the existing Modulus-managed Pillow dependency, are cached separately, and remain build-only artifacts rather than being installed on the device.
+Every normal build also writes printable PDFs to `build/<target>/generated_assets/print/`: written-solo and improvisation versions of each acoustic and electric part, plus one vocal part per song, including every arranged iteration and the ending. Print at actual size on portrait US Letter paper. Pages have white backgrounds, black notation, at least half-inch printer margins, and multiple systems per sheet; guitar parts include TAB. These are fresh 300 DPI renders, without the duplicated lines used by playback transition pages. PDFs use the existing Modulus-managed Pillow dependency, are cached separately, and remain build-only artifacts rather than being installed on the device.
 
 `generator/palette.json` preserves the sheet music’s existing dark palette across Zero, Pico, score pages, and previews. Menus use the same Petaluma Script lettering, quiet rules, tune/composer hierarchy and restrained accent colors for a jazz Real Book feel. Performance status shows Count-in, Playing or Sustain, BPM, page progress and a hold-to-exit hint. CMake generates the shared C++ colors from the same palette used by Python. Palette changes invalidate the engraving cache without changing music, spacing, or pagination.
 

TECHNICAL_GUIDE.md

@@ -37,9 +37,9 @@ The AP setup pins NetworkManager to 2.4 GHz channel 6 with WPA2/RSN and CCMP cip
 
 On Raspberry Pi OS Lite, the installed display service owns `tty1`, conflicts with `getty@tty1.service`, and starts the Zero container through `product_vamp_start_zero`. The wrapper switches to the display VT when `chvt` is available and runs `vamp_zero` inside the container through `setsid --wait --ctty` with `/dev/tty1` as stdin, giving raylib's DRM backend a real virtual terminal while keeping Docker attached to the long-running display process. SSH remains the normal admin path and `tty2` is enabled as the fallback local console.
 
-At startup the Zero validates the packaged `catalog.db` application identifier and required table structure, opens it read-only through Noto, and loads menu metadata. It never creates or migrates a database, scans score JSON, or repairs metadata. The main menu contains Performance and Settings. Settings holds Backing, Metronome, and Tempo; its values apply for the current session. Song -> Part -> Score navigation offers Acoustic, Electric, and Vocal without key selection. Musical interpretation, spacing, beaming, ties, accidentals, and pagination happen on the build host. The Zero displays engraved PNGs and retains at most two page textures.
+At startup the Zero validates the packaged `catalog.db` application identifier and required table structure, opens it read-only through Noto, and loads menu metadata. It never creates or migrates a database, scans score JSON, or repairs metadata. The main menu contains Performance and Settings. Settings holds Backing, Metronome, Solos, and Tempo; its values apply for the current session. Song -> Part -> Score navigation offers Acoustic, Electric, and Vocal without key selection. Musical interpretation, spacing, beaming, ties, accidentals, and pagination happen on the build host. The Zero displays engraved PNGs and retains at most two page textures.
 
-Runtime catalogs contain immutable metadata shared by navigation, the HTTP service, and the UI. Song groups reference canonical records by index. SQLite retains complete bundles, while cached measure/page counts let menu queries avoid reading musical JSON. Python constructs the complete database in one transaction before deployment; metadata and embedded JSON are published together after an integrity check. The `songs` table uses strict column types, primary-key and path uniqueness constraints, and JSON validity checks. Menu rows are ordered by title, composer, part, and ID with binary collation, using the matching `songs_menu` index; C++ groups the ordered rows in one pass without sorting them again. Noto provides read-only connections, bound score lookups, application-ID checks, and quick integrity checks. Product-specific schema and asset-path validation remain in the application. There are no custom rows, runtime imports, metadata-repair triggers, or persisted page-state tables. Selecting a score loads only that bundle asynchronously, discarding stale results after navigation; the view keeps at most two page textures.
+Runtime catalogs contain immutable metadata shared by navigation, the HTTP service, and the UI. Song groups reference canonical records by index. SQLite retains complete bundles, while cached measure/page counts let menu queries avoid reading musical JSON. Python constructs the complete database in one transaction before deployment; metadata and embedded JSON are published together after an integrity check. The `songs` table includes a required integer `solos_enabled` flag (0 or 1), matching the boolean in music metadata. Catalog generation and startup validate paired variants for arranged guitar parts and a single shared Vocal. This schema requires rebuilt assets and updated Zero/Pico software; runtime migration is not supported. The `songs` table uses strict column types, primary-key and path uniqueness constraints, and JSON validity checks. Menu rows are ordered by title, composer, part, and ID with binary collation, using the matching `songs_menu` index; C++ groups the ordered rows in one pass without sorting them again. Noto provides read-only connections, bound score lookups, application-ID checks, and quick integrity checks. Product-specific schema and asset-path validation remain in the application. There are no custom rows, runtime imports, metadata-repair triggers, or persisted page-state tables. Selecting a score loads only that bundle asynchronously, discarding stale results after navigation; the view keeps at most two page textures.
 
 `--once` (also `runtime.exit_after_startup`) is a headless readiness check: it checks database integrity and validates the catalog and referenced page assets, checks runtime-directory writes and the configured server bind, and exits without opening audio/display devices or publishing a readiness heartbeat. Page checks include containment, checksums, CPU-only PNG decoding, and exact 976x484 dimensions. The configured heartbeat destination must be absent or a regular file, never a directory, symlink, or special file. Runtime writes and readiness probes use exclusive sibling temporary files; readiness leaves an existing heartbeat unchanged and removes its probes. `--health-check` instead probes the running service's read-only `/api/health` endpoint using the configured timeout. A stopped/unresponsive service or an invalid response fails the check; it does not create or repair files. `--check-config` remains configuration-only.
 
@@ -55,7 +55,7 @@ Score loading uses a dedicated single-worker executor for SQLite reads and JSON
 
 The build runs `./modulus.py python -m generator` against `data/` and writes build-only assets under the CMake binary tree. Every song produces acoustic, electric, and vocal parts in its authored musical key. Source counts are discovered, not fixed in code. Generator-only optional chord markers are consumed before publishing.
 
-Songs live directly in `data/songs/`. Each source produces acoustic, electric, and vocal parts under `songs/`, with matching page directories. Adding, renaming, or removing a source requires no registry edit. Regeneration replaces the output tree and catalog. The two current songs generate six parts.
+Songs live directly in `data/songs/`. Each source produces acoustic, electric, and vocal parts under `songs/`, with matching page directories. Adding, renaming, or removing a source requires no registry edit. Regeneration replaces the output tree and catalog. Each song generates five bundles: the usual three parts and acoustic/electric `_improv` alternatives. The two current songs generate ten bundles. Solos defaults to On at each app start; Off selects the improvisation guitar variants while Vocal is shared. Part menus retain three rows, using the selected variant’s normal and playback page counts. Pico status includes `solos=0/1`.
 
 The pipeline is Soundslice/MuseScore -> uncompressed `.xml` -> musical model and rhythm plans -> part generation -> semantic JSON, supplied WAVs, engraved pages, and Pico title artwork -> packaged SQLite catalog and assets. Export MusicXML 3.1 or 4.0, `score-partwise`, with one part and one staff. The musical model retains independent voices and per-tone durations/ties. Packaged music describes each generated part, not an archival copy of the XML.
 
@@ -113,6 +113,8 @@ Repeat signs, numbered endings, D.C./D.S./coda navigation, and `time-only` ties
 
 An explicitly marked opening pickup is excluded from the repeated song body. At each vocal or electric melody entry, it is right-aligned within the preceding arrangement bar. Outgoing music continues until the pickup's first sounding note, then releases as the incoming melody takes over; pickup rests do not erase earlier accompaniment. Lyrics, ties into the following downbeat, tuplets, and octave spans retain their timing. Pickup harmony changes also apply to the accompanying parts at their relocated offsets. All parts share the same bar count, and a pickup longer than its destination bar fails generation. Autumn Leaves uses a four-beat padded pickup and a 32-bar body, yielding 171 arrangement bars: the eight-bar intro, five 32-bar passes, and three written held-ending measures.
 
+Improvisation assembly reuses the independent accompaniment and melody roles and fills each source-defined solo window with regular beat slashes. The complete pickup allocation also becomes slashes, including rests within that allocation; music before a partial pickup and subsequent melody handoffs are preserved. Slash events carry no pitches or fret positions, and render in both the staff and TAB. This does not rerun solo composition or change backing recordings, measure numbering, harmony, or performance duration. Both variants receive normal/playback pages and build-only printable PDFs.
+
 Ordinary ties still link adjacent matching tones across measures and systems. Tuplets, independent voices, local staff changes, and manual page navigation are unchanged. The recording’s three-bar sustain tail has no added score section or metronome clicks.
 
 ### Runtime Schema

generator/arrange/assembly.py

@@ -4,11 +4,13 @@ import copy
 import fractions
 
 import generator.accompaniment
+import generator.arrange.form
 import generator.arrange.pickup
 import generator.composition_types
 import generator.fretboard
 import generator.model
 import generator.parts
+import generator.score
 import generator.validation
 
 def mask(document, allowed):
@@ -58,11 +60,28 @@ def fill(notes, length, prefix, voice='voice_arranged'):
   rests(length)
   return result
 
-def assemble(source, results):
+def improvisation(source, template, part):
+  """Fill the source's solo allocation, including pickups, with beat slashes."""
+  document = copy.deepcopy(template)
+  staff = document['staves'][0]
+  for field in ('tuplets', 'octave_shifts', 'scale_spans'):
+    staff[field] = []
+  for measure in staff['measures']:
+    measure['id'] = part + '_improv_' + measure['id']
+    measure['voices'] = [{'id': 'voice_arranged', 'notes': generator.parts.generated_voice(measure, 'slash')}]
+  generator.score.reidentify(staff['measures'], [])
+  plan = generator.arrange.form.FormPlan.read(source.document(), part)
+  mask(document, [(a, b) for a, b, role in plan.windows if role == part + '_solo'])
+  return document
+
+def assemble(source, results, *, solos_enabled=True):
   """Union prevalidated role windows; no selection or pitch/fingering rewrite."""
   documents = {}
   for part in generator.parts.PART_TYPES:
-    selected = [results[r]['document'] for r in generator.composition_types.ROLES if r.startswith(part + '_')]
+    selected = [results[r]['document'] for r in generator.composition_types.ROLES
+      if r.startswith(part + '_') and (solos_enabled or not r.endswith('_solo'))]
+    if not solos_enabled and part != 'vocal':
+      selected.append(improvisation(source, selected[0], part))
     document = copy.deepcopy(selected[0])
     staff = document['staves'][0]
     if part == 'vocal':
@@ -80,7 +99,7 @@ def assemble(source, results):
       for d in selected:
         for voice in d['staves'][0]['measures'][i]['voices']:
           lane = voice['id'] if part == 'acoustic' and voice['id'] in ('upper', 'bass') else 'voice_arranged'
-          sounding = [copy.deepcopy(n) for n in voice['notes'] if n['pitches'] or n.get('tuplet_ids')]
+          sounding = [copy.deepcopy(n) for n in voice['notes'] if n['pitches'] or n.get('tuplet_ids') or n.get('notehead') == 'slash']
           if sounding:
             lanes.setdefault(lane, []).extend(sounding)
       lanes = lanes or {'voice_arranged': []}

generator/catalog.py

@@ -45,10 +45,21 @@ def metadata(path: pathlib.Path, root: pathlib.Path) -> dict:
     raise ValueError('presentation requires a generated Pico title image; regenerate assets')
   if not isinstance(staff['name'], str):
     raise ValueError('staff name must be a string')
+  solos_enabled = meta.get('solos_enabled', True)
+  if type(solos_enabled) is not bool:
+    raise ValueError('solos_enabled must be a boolean')
   relative = path.relative_to(root)
   return dict(id=path.stem, title=meta['title'], composer=meta['composer'], key_signature=key,
     source_path=relative.as_posix(), source_json=text,
-    measure_count=len(staff['measures']), total_pages=len(presentation['pages']), title_image=title_image, part=staff['name'])
+    measure_count=len(staff['measures']), total_pages=len(presentation['pages']), title_image=title_image, part=staff['name'], solos_enabled=int(solos_enabled))
+
+VARIANT_ERRORS = """
+  SELECT json_extract(source_json, '$.music.metadata.song_id'), part FROM songs
+  WHERE json_extract(source_json, '$.music.staves[0].arranged') = 1
+  GROUP BY json_extract(source_json, '$.music.metadata.song_id'), part
+  HAVING (part IN ('Acoustic', 'Electric') AND (count(*) != 2 OR sum(solos_enabled) != 1))
+    OR (part = 'Vocal' AND (count(*) != 1 OR sum(solos_enabled) != 1))
+"""
 
 def populate(connection: sqlite3.Connection, root: pathlib.Path, audio_assets=None) -> None:
   if not root.is_dir():
@@ -70,7 +81,7 @@ def populate(connection: sqlite3.Connection, root: pathlib.Path, audio_assets=No
   with connection:
     connection.execute('BEGIN')
     connection.execute(f'PRAGMA application_id = {APPLICATION_ID}')
-    connection.execute(f'CREATE TABLE songs ({SONG_COLUMNS}, part TEXT NOT NULL) STRICT')
+    connection.execute(f'CREATE TABLE songs ({SONG_COLUMNS}, part TEXT NOT NULL, solos_enabled INTEGER NOT NULL CHECK(solos_enabled IN (0, 1))) STRICT')
     connection.execute('CREATE INDEX songs_menu ON songs(title, composer, part, id)')
     connection.execute('CREATE TABLE resources (id TEXT PRIMARY KEY, value TEXT NOT NULL CHECK(json_valid(value))) STRICT')
     connection.execute('INSERT INTO resources VALUES (?, ?)', ('audio', json.dumps(audio_assets)))
@@ -82,6 +93,8 @@ def populate(connection: sqlite3.Connection, root: pathlib.Path, audio_assets=No
         connection.execute(f'INSERT INTO songs ({", ".join(row)}) VALUES ({", ".join("?" for _ in row)})', tuple(row.values()))
       except (ValueError, KeyError, TypeError, sqlite3.Error) as error:
         raise ValueError(f'{path}: {error}') from error
+    if connection.execute(VARIANT_ERRORS).fetchall():
+      raise ValueError('missing or duplicate solo variants; regenerate score assets')
     if connection.execute('PRAGMA integrity_check').fetchall() != [('ok',)]:
       raise ValueError('catalog integrity check failed')
 

generator/engraving/layout.py

@@ -194,6 +194,8 @@ def part_header(document, fonts, style):
     raise generator.engraving.types.EngravingError('score title cannot fit the page without clipping')
   result = [item]
   subtitle = ' - '.join(str(value) for value in (document['metadata'].get('composer'), document['staves'][0].get('name')) if value)
+  if document['metadata'].get('solos_enabled') is False:
+    subtitle += ' - Improvisation'
   if not subtitle:
     return result
   credit = fonts.text(subtitle, 0, style.margin_y + size, 12, 'subtitle', ())

generator/pico_artwork.py

@@ -20,7 +20,7 @@ TITLE_HEADER = struct.pack('<4sHH', b'VPTI', TITLE_WIDTH, TITLE_HEIGHT)
 TITLE_BYTES = len(TITLE_HEADER) + TITLE_WIDTH * TITLE_HEIGHT // 2
 MAX_TITLES = 8192
 LABELS = ('VAMP', 'CONNECTING', 'OFFLINE', 'BUSY', 'READY', 'LOADING', 'WIFI', 'ERROR', 'PAGE', 'Acoustic', 'Electric', 'Vocal', 'UNAVAILABLE',
-  'Main Menu', 'Performance', 'Settings', 'Backing', 'Metronome', 'Tempo', 'Back', 'On', 'Off', 'BPM', 'Manual', 'Preparing', 'Count-in', 'Playing', 'Sustain', 'Hold to exit')
+  'Main Menu', 'Performance', 'Settings', 'Backing', 'Metronome', 'Solos', 'Tempo', 'Back', 'On', 'Off', 'BPM', 'Manual', 'Preparing', 'Count-in', 'Playing', 'Sustain', 'Hold to exit')
 SPRITES = LABELS + tuple('0123456789/')
 DIGIT_WIDTH = 22
 DEFAULT_FONT_ROOT = pathlib.Path(__file__).resolve().parents[1] / 'package/assets/fonts/petaluma'

generator/production.py

@@ -53,13 +53,17 @@ def generate_tree(source_dir, output_dir, *, jobs=2, cache_dir=None, progress=Fa
         except Exception as error:
           raise ValueError(f'{path.name}/{role}: {error}') from error
   for path, (original, source) in sources.items():
-    assembled = generator.arrange.assembly.assemble(source, results[path])
-    generator.arrange.accompaniment.audit(original, assembled)
     reuse = generator.arrange.accompaniment.audit(original, {role: value['document'] for role, value in results[path].items()}, role_documents=True)
+    for solos_enabled in (True, False):
+      assembled = generator.arrange.assembly.assemble(source, results[path], solos_enabled=solos_enabled)
+      generator.arrange.accompaniment.audit(original, assembled)
       for part, document in assembled.items():
+        if part == 'vocal' and not solos_enabled:
+          continue
         document['metadata'] = copy.deepcopy(original['metadata'])
-      document['metadata']['song_id'] = generator.score.slugify(path.stem)
-      generator.score_io.write_json(output_dir / (generator.score.slugify(path.stem) + '_' + part + '.json'), document)
+        document['metadata'].update(song_id=generator.score.slugify(path.stem), solos_enabled=solos_enabled)
+        suffix = '' if solos_enabled else '_improv'
+        generator.score_io.write_json(output_dir / (generator.score.slugify(path.stem) + '_' + part + suffix + '.json'), document)
     analysis_dir = output_dir.parent / 'analysis'
     analysis_dir.mkdir(parents=True, exist_ok=True)
     (analysis_dir / (generator.score.slugify(path.stem) + '.txt')).write_text('\n'.join(results[path][r]['report'] for r in generator.composition_types.ROLES))
@@ -68,4 +72,4 @@ def generate_tree(source_dir, output_dir, *, jobs=2, cache_dir=None, progress=Fa
     for role, audit in reuse.items():
       stable[role]['details']['reuse_audit'] = audit
     (analysis_dir / (generator.score.slugify(path.stem) + '.roles')).write_text(json.dumps(stable, sort_keys=True, indent=2))
-  return len(sources) * 3
+  return len(sources) * 5

include/vamp_pico/artwork.hpp

@@ -44,6 +44,7 @@ enum class sprite : std::size_t {
   SETTINGS,
   BACKING,
   METRONOME,
+  SOLOS,
   TEMPO,
   BACK,
   ON,

include/vamp_pico/http_client.hpp

@@ -25,13 +25,14 @@ struct remote_display_state {
   std::bool_t error{};
   std::array<std::char_t, 16> phase{};
   std::bool_t metronome{};
+  std::bool_t solos{true};
   std::bool_t editing{};
   std::uint32_t bpm{120U};
   std::array<std::char_t, vamp_protocol::title_id_size + 1U> title_image{};
   std::uint32_t page{};
   std::uint32_t pages{};
   auto operator==(remote_display_state const &other) const -> std::bool_t {
-    return backing_available == other.backing_available && error == other.error && phase == other.phase && active == other.active && std::string_view{title} == other.title && std::string_view{part} == other.part && std::string_view{mode} == other.mode && std::string_view{focus} == other.focus && backing == other.backing && metronome == other.metronome && editing == other.editing && bpm == other.bpm && title_image == other.title_image && page == other.page && pages == other.pages;
+    return backing_available == other.backing_available && error == other.error && phase == other.phase && active == other.active && std::string_view{title} == other.title && std::string_view{part} == other.part && std::string_view{mode} == other.mode && std::string_view{focus} == other.focus && backing == other.backing && metronome == other.metronome && solos == other.solos && editing == other.editing && bpm == other.bpm && title_image == other.title_image && page == other.page && pages == other.pages;
   }
 };
 

include/vamp_zero/menu.hpp

@@ -7,6 +7,14 @@
 
 namespace vamp_zero {
 
+namespace settings_row {
+inline constexpr std::size_t backing = 1U;
+inline constexpr std::size_t metronome = 2U;
+inline constexpr std::size_t solos = 3U;
+inline constexpr std::size_t tempo = 4U;
+inline constexpr std::size_t count = 5U;
+}
+
 enum class menu_action_kind { ACTIVATE,
                               PREVIOUS,
                               NEXT,

include/vamp_zero/navigation.hpp

@@ -12,6 +12,7 @@
 namespace vamp_zero {
 
 auto selected_group(vamp_zero::app_state const &state) -> vamp_zero::song_group const *;
+auto visible_parts(vamp_zero::app_state const &state) -> std::vector<std::size_t>;
 auto selected_part(vamp_zero::app_state const &state) -> vamp_zero::library_part const *;
 auto active_part(vamp_zero::app_state const &state) -> vamp_zero::library_part const *;
 auto active_pages(vamp_zero::app_state const &state) -> std::size_t;

include/vamp_zero/types.hpp

@@ -71,6 +71,7 @@ struct library_part {
   std::string title_image{};
   std::string song_id{};
   std::size_t playback_pages{};
+  std::bool_t solos_enabled{true};
 };
 
 struct song_group {
@@ -123,6 +124,7 @@ struct app_state {
   std::shared_ptr<vamp_zero::catalog const> catalog{vamp_zero::empty_catalog()};
   vamp_zero::app_mode mode{vamp_zero::app_mode::MAIN_MENU};
   vamp_zero::audio_state audio{};
+  std::bool_t solos_enabled{true};
   std::size_t selected_main_menu_index{};
   std::size_t selected_settings_index{1U};
   std::size_t remembered_settings_index{1U};

src/vamp_pico/remote_display.cpp

@@ -76,13 +76,14 @@ auto vamp_pico::parse_remote_display_body(std::string_view body, vamp_pico::remo
           return false;
         }
         std::copy(value.begin(), value.end(), parsed.phase.begin());
-      } else if (key == "backing" || key == "metronome" || key == "editing" || key == "error" || key == "backing_available") {
+      } else if (key == "backing" || key == "metronome" || key == "solos" || key == "editing" || key == "error" || key == "backing_available") {
         if (value != "0" && value != "1") {
           return false;
         }
         auto &flag = key == "backing_available" ? parsed.backing_available : key == "error"     ? parsed.error
                                                                            : key == "backing"   ? parsed.backing
                                                                            : key == "metronome" ? parsed.metronome
+                                                                           : key == "solos"     ? parsed.solos
                                                                                                 : parsed.editing;
         flag = value == "1";
       } else if (key == "bpm") {

src/vamp_pico/screen.cpp

@@ -11,8 +11,8 @@ auto blend(std::uint16_t background, vamp_style::color foreground, std::uint8_t
 }
 
 auto label_sprite(std::string_view text) -> vamp_pico::sprite {
-  constexpr auto names = std::array<std::string_view, 10>{"Acoustic", "Electric", "Vocal", "Performance", "Settings", "Backing", "Metronome", "Tempo", "Back", "Main Menu"};
-  constexpr auto sprites = std::array{vamp_pico::sprite::ACOUSTIC, vamp_pico::sprite::ELECTRIC, vamp_pico::sprite::VOCAL, vamp_pico::sprite::PERFORMANCE, vamp_pico::sprite::SETTINGS, vamp_pico::sprite::BACKING, vamp_pico::sprite::METRONOME, vamp_pico::sprite::TEMPO, vamp_pico::sprite::BACK, vamp_pico::sprite::MAIN_MENU};
+  constexpr auto names = std::array<std::string_view, 11>{"Acoustic", "Electric", "Vocal", "Performance", "Settings", "Backing", "Metronome", "Solos", "Tempo", "Back", "Main Menu"};
+  constexpr auto sprites = std::array{vamp_pico::sprite::ACOUSTIC, vamp_pico::sprite::ELECTRIC, vamp_pico::sprite::VOCAL, vamp_pico::sprite::PERFORMANCE, vamp_pico::sprite::SETTINGS, vamp_pico::sprite::BACKING, vamp_pico::sprite::METRONOME, vamp_pico::sprite::SOLOS, vamp_pico::sprite::TEMPO, vamp_pico::sprite::BACK, vamp_pico::sprite::MAIN_MENU};
   for (auto i = std::size_t{}; i < names.size(); ++i) {
     if (names[i] == text) {
       return sprites[i];
@@ -118,11 +118,11 @@ auto vamp_pico::render_scanline(std::array<std::uint16_t, vamp_pico::display_wid
       if (state.editing && (y == 184U || y == 226U)) {
         fill(64U, 256U, vamp_style::accent);
       }
-    } else if (focus == "Backing" || focus == "Metronome") {
+    } else if (focus == "Backing" || focus == "Metronome" || focus == "Solos") {
       if (focus == "Backing" && !state.backing_available) {
         centered(sprite::UNAVAILABLE, 192U, vamp_style::muted);
       } else {
-        centered((focus == "Backing" ? state.backing : state.metronome) ? sprite::ON : sprite::OFF, 192U, vamp_style::accent);
+        centered((focus == "Backing" ? state.backing : focus == "Metronome" ? state.metronome : state.solos) ? sprite::ON : sprite::OFF, 192U, vamp_style::accent);
       }
     }
   }

src/vamp_zero/database.cpp

@@ -95,7 +95,7 @@ auto valid_title_image(noto::sqlite_value const &value) -> std::bool_t {
 }
 
 auto compatible_catalog(noto::connection &connection) -> boost::asio::awaitable<std::bool_t> {
-  auto columns = std::vector<std::string_view>{"id", "title", "composer", "key_signature", "source_path", "source_json", "measure_count", "total_pages", "title_image", "part"};
+  auto columns = std::vector<std::string_view>{"id", "title", "composer", "key_signature", "source_path", "source_json", "measure_count", "total_pages", "title_image", "part", "solos_enabled"};
   auto parameters = std::vector<noto::sqlite_value>{noto::sqlite_value{"songs"}};
   auto selected = co_await connection.async_execute("SELECT name, type, \"notnull\", pk FROM pragma_table_info(?1) "
                                                     "WHERE EXISTS (SELECT 1 FROM pragma_table_list WHERE schema = 'main' AND name = ?1 AND type = 'table' AND strict = 1) ORDER BY cid",
@@ -110,7 +110,7 @@ auto compatible_catalog(noto::connection &connection) -> boost::asio::awaitable<
     }
     auto required = std::get_if<std::int64_t>(&row[2].value);
     auto primary = std::get_if<std::int64_t>(&row[3].value);
-    auto type = index == 6U || index == 7U ? "INTEGER" : "TEXT";
+    auto type = index == 6U || index == 7U || index == 10U ? "INTEGER" : "TEXT";
     if (text_value(row[0]) != columns[index] || text_value(row[1]) != type || required == nullptr || *required != 1 || primary == nullptr || *primary != (index == 0U ? 1 : 0)) {
       co_return false;
     }
@@ -138,6 +138,17 @@ auto vamp_zero::async_validate_database(boost::asio::any_io_executor executor, v
   if (status && !(co_await compatible_catalog(connection))) {
     status = std::unexpected(vamp_zero::make_error(vamp_zero::error_code::PERSISTENCE, "incompatible songs catalog: " + config.path + "; rebuild or reinstall Product Vamp"));
   }
+  if (status) {
+    auto variants = co_await connection.async_execute(
+      "SELECT json_extract(source_json, '$.music.metadata.song_id'), part FROM songs "
+      "WHERE json_extract(source_json, '$.music.staves[0].arranged') = 1 "
+      "GROUP BY json_extract(source_json, '$.music.metadata.song_id'), part "
+      "HAVING (part IN ('Acoustic', 'Electric') AND (count(*) != 2 OR sum(solos_enabled) != 1)) "
+      "OR (part = 'Vocal' AND (count(*) != 1 OR sum(solos_enabled) != 1)) LIMIT 1");
+    if (!variants || !variants->rows.empty()) {
+      status = std::unexpected(vamp_zero::make_error(vamp_zero::error_code::PERSISTENCE, "missing or duplicate solo variants; rebuild or reinstall Product Vamp"));
+    }
+  }
   if (status && integrity) {
     auto checked = co_await connection.async_quick_check();
     if (!checked || *checked != std::vector<std::string>{"ok"}) {
@@ -159,7 +170,7 @@ auto vamp_zero::async_load_catalog(boost::asio::any_io_executor executor, vamp_z
     co_return std::unexpected(connected.error());
   }
   auto selected =
-    co_await connection.async_prepare("SELECT id, title, composer, part, source_path, measure_count, key_signature, total_pages, title_image, json_extract(source_json, '$.music.metadata.song_id'), json_array_length(source_json, '$.presentation.playback_pages') FROM "
+    co_await connection.async_prepare("SELECT id, title, composer, part, source_path, measure_count, key_signature, total_pages, title_image, json_extract(source_json, '$.music.metadata.song_id'), json_array_length(source_json, '$.presentation.playback_pages'), solos_enabled FROM "
                                       "songs ORDER BY title, composer, part, id");
   if (!selected) {
     auto close = co_await connection.async_close();
@@ -180,7 +191,8 @@ auto vamp_zero::async_load_catalog(boost::asio::any_io_executor executor, vamp_z
       break;
     }
     auto const &row = **next;
-    if (row.size() != 11U || count_value(row[5]) == 0U || count_value(row[7]) == 0U || count_value(row[10]) == 0U || !valid_title_image(row[8])) {
+    auto solos = row.size() == 12U ? std::get_if<std::int64_t>(&row[11].value) : nullptr;
+    if (!solos || (*solos != 0 && *solos != 1) || count_value(row[5]) == 0U || count_value(row[7]) == 0U || count_value(row[10]) == 0U || !valid_title_image(row[8])) {
       status = std::unexpected(vamp_zero::make_error(vamp_zero::error_code::PERSISTENCE, "invalid performance metadata; regenerate score assets"));
       break;
     }
@@ -201,6 +213,7 @@ auto vamp_zero::async_load_catalog(boost::asio::any_io_executor executor, vamp_z
       .title_image = text_value(row[8]),
       .song_id = text_value(row[9]),
       .playback_pages = count_value(row[10]),
+      .solos_enabled = *solos == 1,
     });
   }
   auto audio_assets = std::expected<std::vector<vamp_zero::audio_asset>, modulus::error>{};

src/vamp_zero/menu.cpp

@@ -12,14 +12,11 @@ auto vamp_zero::menu_count(vamp_zero::app_state const &state) -> std::size_t {
   case vamp_zero::app_mode::MAIN_MENU:
     return 2U;
   case vamp_zero::app_mode::SETTINGS_MENU:
-    return 4U;
+    return settings_row::count;
   case vamp_zero::app_mode::PERFORMANCE_SONG_MENU:
     return state.catalog->groups.size() + 1U;
   case vamp_zero::app_mode::PERFORMANCE_PART_MENU:
-    if (auto group = selected_group(state)) {
-      return group->parts.size() + 1U;
-    }
-    return 1U;
+    return visible_parts(state).size() + 1U;
   case vamp_zero::app_mode::PERFORMANCE_SCORE:
     return 0U;
   }
@@ -72,23 +69,26 @@ auto vamp_zero::menu_row(vamp_zero::app_state const &state, std::size_t row) ->
     return {"Back", ""};
   }
   if (state.mode == vamp_zero::app_mode::SETTINGS_MENU) {
-    if (row == 1U) {
+    if (row == settings_row::backing) {
       auto enabled = state;
       enabled.audio.backing_enabled = true;
       return {"Backing", vamp_zero::available_tempos(enabled).empty() ? "Unavailable" : state.audio.backing_enabled ? "On"
                                                                                                                     : "Off"};
     }
-    if (row == 2U) {
+    if (row == settings_row::metronome) {
       return {"Metronome", state.audio.metronome_enabled ? "On" : "Off"};
     }
+    if (row == settings_row::solos) {
+      return {"Solos", state.solos_enabled ? "On" : "Off"};
+    }
     return {"Tempo", std::to_string(state.audio.tempo_bpm) + " BPM"};
   }
   if (state.mode == vamp_zero::app_mode::PERFORMANCE_SONG_MENU) {
     auto const &group = state.catalog->groups[row - 1U];
     return {group.title, group.composer};
   }
-  if (auto group = selected_group(state)) {
-    auto const &part = state.catalog->parts[group->parts[row - 1U]];
+  if (auto parts = visible_parts(state); row <= parts.size()) {
+    auto const &part = state.catalog->parts[parts[row - 1U]];
     return {part.part, std::to_string(part.total_pages) + " pages"};
   }
   return {};
@@ -105,10 +105,10 @@ auto vamp_zero::apply_menu_action(vamp_zero::app_state state, vamp_zero::menu_ac
     return state;
   }
   if (action.kind == vamp_zero::menu_action_kind::TEMPO_DOWN || action.kind == vamp_zero::menu_action_kind::TEMPO_UP) {
-    if (state.mode != vamp_zero::app_mode::SETTINGS_MENU || action.row != 3U) {
+    if (state.mode != vamp_zero::app_mode::SETTINGS_MENU || action.row != settings_row::tempo) {
       return state;
     }
-    state.selected_settings_index = 3U;
+    state.selected_settings_index = settings_row::tempo;
     state.audio.tempo_editing = true;
     state = apply_app_command(std::move(state), action.kind == vamp_zero::menu_action_kind::TEMPO_UP ? vamp_protocol::page_command::NEXT : vamp_protocol::page_command::PREVIOUS);
     state.audio.tempo_editing = false;

src/vamp_zero/menu_view.cpp

@@ -50,7 +50,7 @@ auto vamp_zero::menu_layout(luma::rect bounds, vamp_zero::app_state const &state
   for (auto i = std::size_t{}; i < visible; ++i) {
     auto row = first + i;
     auto rectangle = luma::rect{bounds.x + 36.0F, bounds.y + 112.0F + static_cast<std::float32_t>(i) * 72.0F, bounds.width - 72.0F, 72.0F};
-    if (state.mode == vamp_zero::app_mode::SETTINGS_MENU && row == 3U) {
+    if (state.mode == vamp_zero::app_mode::SETTINGS_MENU && row == settings_row::tempo) {
       add({rectangle.x + rectangle.width - 240.0F, rectangle.y + 12.0F, 48.0F, 48.0F}, vamp_zero::menu_action_kind::TEMPO_DOWN, row);
       add({rectangle.x + rectangle.width - 64.0F, rectangle.y + 12.0F, 48.0F, 48.0F}, vamp_zero::menu_action_kind::TEMPO_UP, row);
     }
@@ -130,9 +130,9 @@ auto vamp_zero::draw_menu(luma::draw_context &context, luma::rect bounds, vamp_z
     draw_label(context, {row.x + 22.0F, row.y + (songs ? 4.0F : 12.0F), row.width - (songs ? 90.0F : 290.0F), songs ? 36.0F : 48.0F}, item.label, 26.0F, vamp_style::ink);
     if (songs) {
       draw_label(context, {row.x + 22.0F, row.y + 39.0F, row.width - 90.0F, 28.0F}, item.detail, 17.0F, vamp_style::muted);
-    } else if (settings && action.row < 3U) {
+    } else if (settings && action.row != settings_row::tempo) {
       draw_label(context, {row.x + row.width - 245.0F, row.y + 12.0F, 145.0F, 48.0F}, item.detail, 20.0F, vamp_style::muted);
-      draw_switch(context, row, action.row == 1U ? state.audio.backing_enabled : state.audio.metronome_enabled);
+      draw_switch(context, row, action.row == settings_row::backing ? state.audio.backing_enabled : action.row == settings_row::metronome ? state.audio.metronome_enabled : state.solos_enabled);
     } else {
       draw_label(context, {row.x + row.width - (settings ? 181.0F : 250.0F), row.y + 12.0F, settings ? 112.0F : 180.0F, 48.0F}, item.detail, 20.0F, settings && state.audio.tempo_editing ? vamp_style::accent : vamp_style::muted);
     }

src/vamp_zero/navigation.cpp

@@ -15,16 +15,31 @@ auto vamp_zero::selected_group(vamp_zero::app_state const &state) -> vamp_zero::
   return &state.catalog->groups[index];
 }
 
+auto vamp_zero::visible_parts(vamp_zero::app_state const &state) -> std::vector<std::size_t> {
+  auto parts = std::vector<std::size_t>{};
+  if (auto group = selected_group(state); group != nullptr) {
+    for (auto index : group->parts) {
+      if (index < state.catalog->parts.size()) {
+        auto const &part = state.catalog->parts[index];
+        if (part.part == "Vocal" || part.solos_enabled == state.solos_enabled) {
+          parts.push_back(index);
+        }
+      }
+    }
+  }
+  return parts;
+}
+
 auto vamp_zero::selected_part(vamp_zero::app_state const &state) -> vamp_zero::library_part const * {
-  auto const *group = vamp_zero::selected_group(state);
-  if (state.selected_part_index == 0U || group == nullptr || group->parts.empty()) {
+  auto parts = visible_parts(state);
+  if (state.selected_part_index == 0U) {
     return nullptr;
   }
   auto index = state.selected_part_index - 1U;
-  if (index >= group->parts.size()) {
+  if (index >= parts.size()) {
     return nullptr;
   }
-  auto part_index = group->parts[index];
+  auto part_index = parts[index];
   return part_index < state.catalog->parts.size() ? &state.catalog->parts[part_index] : nullptr;
 }
 

src/vamp_zero/page_control.cpp

@@ -18,9 +18,6 @@
 namespace {
 
 constexpr auto main_menu_performance = std::size_t{0};
-constexpr auto settings_backing = std::size_t{1};
-constexpr auto settings_metronome = std::size_t{2};
-constexpr auto settings_tempo = std::size_t{3};
 constexpr auto main_menu_count = std::size_t{2};
 
 auto wrap_next(std::size_t value, std::size_t count) -> std::size_t {
@@ -70,15 +67,15 @@ auto clamp_state(vamp_zero::app_state state) -> vamp_zero::app_state {
     state.catalog = vamp_zero::empty_catalog();
   }
   normalize_tempo(state);
-  state.selected_settings_index = std::min<std::size_t>(state.selected_settings_index, 3U);
-  state.remembered_settings_index = std::clamp<std::size_t>(state.remembered_settings_index, 1U, 3U);
+  state.selected_settings_index = std::min<std::size_t>(state.selected_settings_index, vamp_zero::settings_row::count - 1U);
+  state.remembered_settings_index = std::clamp<std::size_t>(state.remembered_settings_index, vamp_zero::settings_row::backing, vamp_zero::settings_row::count - 1U);
   if (state.mode == vamp_zero::app_mode::SETTINGS_MENU && state.selected_settings_index != 0U) {
     state.remembered_settings_index = state.selected_settings_index;
   }
   state.selected_main_menu_index = std::min(state.selected_main_menu_index, main_menu_count - 1U);
   state.selected_song_index = std::min(state.selected_song_index, menu_row_count(state.catalog->groups.size()) - 1U);
   if (auto const *group = selected_group(state); group != nullptr) {
-    state.selected_part_index = std::min(state.selected_part_index, menu_row_count(group->parts.size()) - 1U);
+    state.selected_part_index = std::min(state.selected_part_index, menu_row_count(visible_parts(state).size()) - 1U);
   } else {
     state.selected_part_index = 0U;
   }
@@ -146,16 +143,18 @@ auto vamp_zero::apply_app_command(vamp_zero::app_state state, vamp_protocol::pag
         state.audio.tempo_editing = false;
       }
     } else if (command == vamp_protocol::page_command::NEXT) {
-      state.selected_settings_index = wrap_next(state.selected_settings_index, 4U);
+      state.selected_settings_index = wrap_next(state.selected_settings_index, settings_row::count);
     } else if (command == vamp_protocol::page_command::PREVIOUS) {
-      state.selected_settings_index = wrap_previous(state.selected_settings_index, 4U);
+      state.selected_settings_index = wrap_previous(state.selected_settings_index, settings_row::count);
     } else if (state.selected_settings_index == 0U) {
       state.mode = vamp_zero::app_mode::MAIN_MENU;
-    } else if (state.selected_settings_index == settings_backing) {
+    } else if (state.selected_settings_index == settings_row::backing) {
       state.audio.backing_enabled = !state.audio.backing_enabled;
-    } else if (state.selected_settings_index == settings_metronome) {
+    } else if (state.selected_settings_index == settings_row::metronome) {
       state.audio.metronome_enabled = !state.audio.metronome_enabled;
-    } else if (state.selected_settings_index == settings_tempo) {
+    } else if (state.selected_settings_index == settings_row::solos) {
+      state.solos_enabled = !state.solos_enabled;
+    } else if (state.selected_settings_index == settings_row::tempo) {
       state.audio.tempo_editing = true;
     }
     return clamp_state(std::move(state));
@@ -177,9 +176,9 @@ auto vamp_zero::apply_app_command(vamp_zero::app_state state, vamp_protocol::pag
   case vamp_zero::app_mode::PERFORMANCE_PART_MENU:
     if (auto const *group = selected_group(state); group != nullptr) {
       if (command == vamp_protocol::page_command::NEXT) {
-        state.selected_part_index = wrap_next(state.selected_part_index, menu_row_count(group->parts.size()));
+        state.selected_part_index = wrap_next(state.selected_part_index, menu_row_count(visible_parts(state).size()));
       } else if (command == vamp_protocol::page_command::PREVIOUS) {
-        state.selected_part_index = wrap_previous(state.selected_part_index, menu_row_count(group->parts.size()));
+        state.selected_part_index = wrap_previous(state.selected_part_index, menu_row_count(visible_parts(state).size()));
       } else if (state.selected_part_index == 0U) {
         state.mode = vamp_zero::app_mode::PERFORMANCE_SONG_MENU;
         state.active_part_id.clear();
@@ -252,6 +251,7 @@ auto vamp_zero::remote_display_text(vamp_zero::app_state const &state) -> std::s
   output << "backing_available=" << (vamp_zero::available_tempos(backing_state).empty() ? "0" : "1") << "\n";
   output << "backing=" << (state.audio.backing_enabled ? "1" : "0") << "\n";
   output << "metronome=" << (state.audio.metronome_enabled ? "1" : "0") << "\n";
+  output << "solos=" << (state.solos_enabled ? "1" : "0") << "\n";
   output << "phase=" << sanitize_line_value(state.audio.phase) << "\n";
   output << "error=" << (state.audio.playback_error.empty() ? "0" : "1") << "\n";
   output << "bpm=" << state.audio.tempo_bpm << "\n";
@@ -272,7 +272,7 @@ auto vamp_zero::validate_app_state(vamp_zero::app_state const &state) -> std::ex
   if (state.selected_main_menu_index >= main_menu_count) {
     return std::unexpected(vamp_zero::make_error(vamp_zero::error_code::INVALID_ARGUMENT, "selected main menu index is out of range"));
   }
-  if (state.selected_settings_index >= 4U) {
+  if (state.selected_settings_index >= settings_row::count) {
     return std::unexpected(vamp_zero::make_error(vamp_zero::error_code::INVALID_ARGUMENT, "selected settings index is out of range"));
   }
   auto tempos = vamp_zero::available_tempos(state);
@@ -286,7 +286,7 @@ auto vamp_zero::validate_app_state(vamp_zero::app_state const &state) -> std::ex
     return std::unexpected(vamp_zero::make_error(vamp_zero::error_code::INVALID_ARGUMENT, "selected performance song row is out of range"));
   }
   if (auto const *group = selected_group(state);
-      group != nullptr && state.selected_part_index >= menu_row_count(group->parts.size())) {
+      group != nullptr && state.selected_part_index >= menu_row_count(visible_parts(state).size())) {
     return std::unexpected(vamp_zero::make_error(vamp_zero::error_code::INVALID_ARGUMENT, "selected performance part row is out of range"));
   }
   if (state.mode == vamp_zero::app_mode::PERFORMANCE_SCORE) {

tests/fixtures/assets_manifest.json

@@ -1,173 +1,314 @@
 {
   "backing/all_of_me_120.wav": "5104097be1d4ed0459dacedb61c2509effcfe0e26025b24574291a3467962f3d",
   "backing/autumn_leaves_120.wav": "990e0218f9a09161a7a8a255bd1e64daf9fd01ac41935faa273228906775d016",
-  "catalog.db": "0891794877e06d201e1e149ea82f7bfdc880baf35c78a29b7b724f6c0ecce1e9",
+  "catalog.db": "3bb66b4460363bbab987bae5a36e00ac1d6575deb9815b6b6ce07cb64cc83764",
   "fonts/petaluma/OFL.txt": "5789e74d38031e93a4fbdb0a72392d1fd58cf15c29da3efa695c5099433ad0ce",
   "fonts/petaluma/PetalumaScript.otf": "3b4be972cc9f857a7c1019ff49cd07cb083d5cc99058c0fb8563897fc75c32c8",
   "pico/titles/42076b2eaa61a6fb408eeaec133b130967cf2c32981a9444dde6903ed7771fc8.mask": "42076b2eaa61a6fb408eeaec133b130967cf2c32981a9444dde6903ed7771fc8",
   "pico/titles/8ed7df6668e9e4a24c148ba0fe9ac57209e504ca6a7e8a9b29179c097076ecae.mask": "8ed7df6668e9e4a24c148ba0fe9ac57209e504ca6a7e8a9b29179c097076ecae",
-  "print/all_of_me_acoustic.pdf": "aff0697fa82bde5283f705395028a3e4f6e87d4e0f1eab271dea9cffdb6c72e2",
-  "print/all_of_me_electric.pdf": "1185ece1e8f507d6fd7046e9d78fcb28b9e0a667c1027304abcb13c8e0519b97",
+  "print/all_of_me_acoustic.pdf": "210000b746f411e68b38c2be58dd8807d5da263799084708972a5a11ac9ba724",
+  "print/all_of_me_acoustic_improv.pdf": "882c2c5a855cf411d2d443de4661452edb0ec6e624c0ddc17b49f4fc07a3cd4a",
+  "print/all_of_me_electric.pdf": "83cd1c2780b64cc6194d42baf95e85c39ab68ba8789572f266310724ce16c403",
+  "print/all_of_me_electric_improv.pdf": "4642f8a81052502979ac867d40fb3248a7674f587939f5ecc9adaff3bae30fa4",
   "print/all_of_me_vocal.pdf": "0ff78cb9d315dff93e7a88209610e959fa804c480cf63a8c4fb018a17c46ff66",
-  "print/autumn_leaves_acoustic.pdf": "badafe4d5484ab7e8a7c94633174d2233233436318fcf62bfcc043f624d097d6",
-  "print/autumn_leaves_electric.pdf": "a7416f9c4390072f74736024162172340d273de5108681bdf6543c9b8fa69d60",
+  "print/autumn_leaves_acoustic.pdf": "f31537d21ea65ba410f0423fe98798f85e0a82600460c41eecc577f427617125",
+  "print/autumn_leaves_acoustic_improv.pdf": "d15456a77bdb4dfb5e78b0f3045b7a1d10ada056f03ee3994e6c98e310186419",
+  "print/autumn_leaves_electric.pdf": "11532f29ba9a7543fbd2c64917137fe4acf838a0fed801dedb09b0a3abd81aeb",
+  "print/autumn_leaves_electric_improv.pdf": "a0099729711f40367ff54a8554fcafd5aa2c3d529b4ccac882d8cb81026da830",
   "print/autumn_leaves_vocal.pdf": "78cc66dd27c7088e196f917eb752266989de13c51361692195b6bb9765210001",
-  "songs/all_of_me_acoustic.json": "b5f9f3781a79a351a59bbb54a333cbb1dac9e21c46a33c4296d6baef0ed8ff41",
-  "songs/all_of_me_acoustic.pages/0001.png": "165e827c3a05c1ee2aa1e5fd41c9dd2b273dac04e067df6d3e136f16fd2255a1",
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+  "songs/autumn_leaves_electric_improv.pages/playback-0026.png": "7bc2cf14428c6d9a137840bf423de648b2f0b5505ce1c7a8b61791e167d66d56",
+  "songs/autumn_leaves_electric_improv.pages/playback-0027.png": "e0ab8c074bd0286744106a5e6fff11b9b24a4aae4a4822414ae38bcb84b0f845",
+  "songs/autumn_leaves_electric_improv.pages/playback-0028.png": "1099b56128019d5b637f23e04336553c9a0af6b686bf9c8a41244b81891cd01c",
+  "songs/autumn_leaves_electric_improv.pages/playback-0029.png": "a574680a3659a3a0f2a461f6d296a5d4e138579ac9cedc3f2423426519da75b5",
+  "songs/autumn_leaves_electric_improv.pages/playback-0030.png": "36df93cd562a2452f1035c1243eaecdadd8853318ee5694d31780900564243a5",
+  "songs/autumn_leaves_electric_improv.pages/playback-0031.png": "bfe81e7c69459d19bf5da1b44ca270a9f284e58250d3a7a440daaf9b145e5bfd",
+  "songs/autumn_leaves_electric_improv.pages/playback-0032.png": "ea49ab07e94cc0477ef29b804048458532e1a4f42c545f862cf2b9ade40fd098",
+  "songs/autumn_leaves_electric_improv.pages/playback-0033.png": "766abf245d2c92659df00fbb17e3e2392fbfa4d7064bdbc1ca5d0c71073bbff4",
+  "songs/autumn_leaves_electric_improv.pages/playback-0034.png": "f2e90f61126a6e1ae61d834aa8bd4b0463fb4981ffe2ac3fc214b8638417d36f",
+  "songs/autumn_leaves_electric_improv.pages/playback-0035.png": "78f87a74619a50bd40c7bad4fa2522cb74d815fe44a9c7e2987e790284fa8631",
+  "songs/autumn_leaves_electric_improv.pages/playback-0036.png": "6a0edfc9448247de68b9700f20889f75cbf3f0ca553a06d975e672679fe59dca",
+  "songs/autumn_leaves_electric_improv.pages/playback-0037.png": "855d996c7fb4616ca240698c1ab9f90c02971bf26279af38f2ff594e7d2ddf40",
+  "songs/autumn_leaves_electric_improv.pages/playback-0038.png": "c01d3874dbb703e33e3f1e4ca8d5edb01e08c53314499813d9e04ba16054c74e",
+  "songs/autumn_leaves_electric_improv.pages/playback-0039.png": "158c0ca1c6df28d4e0842a63b51258b351935a0a5e0bfd7eb201b4791b1e1f80",
+  "songs/autumn_leaves_electric_improv.pages/playback-0040.png": "3b4331d2b0d31583b800405506e188695a2e14aaf8a1dd2409e0eeb2b2651d91",
+  "songs/autumn_leaves_vocal.json": "b0e22bf88d75521bdc4bc8acbbd31440aae79e38b6d84c4048dd729fce82ed5f",
   "songs/autumn_leaves_vocal.pages/0001.png": "4b9402563b8ae88a34f25482d5db3d5279643bed60731c7baac69a030b3ce2d9",
   "songs/autumn_leaves_vocal.pages/0002.png": "b961fb05e5539ce4335b561df9fc9558b81574872a35956da0beb192a8db258e",
   "songs/autumn_leaves_vocal.pages/0003.png": "a3e5423f083d8159e52dd4f1fa1532b982a4290dc3db75921a120fa3befb5c7d",

tests/test.cpp

@@ -1,3 +1,4 @@
+#include <vamp_zero/menu.hpp>
 #include <test.hpp>
 #include "catalog_fixture.hpp"
 
@@ -157,7 +158,12 @@ BOOST_AUTO_TEST_CASE(settings_menu_toggles_audio_settings_and_edits_tempo) {
   BOOST_TEST(state.audio.metronome_enabled);
   BOOST_TEST(static_cast<std::int32_t>(state.mode) == static_cast<std::int32_t>(vamp_zero::app_mode::SETTINGS_MENU));
   state = vamp_zero::apply_app_command(std::move(state), vamp_protocol::page_command::NEXT);
-  BOOST_TEST(state.selected_settings_index == 3U);
+  BOOST_TEST(state.selected_settings_index == vamp_zero::settings_row::solos);
+  BOOST_TEST(state.solos_enabled);
+  state = vamp_zero::apply_app_command(std::move(state), vamp_protocol::page_command::SELECT);
+  BOOST_TEST(!state.solos_enabled);
+  state = vamp_zero::apply_app_command(std::move(state), vamp_protocol::page_command::NEXT);
+  BOOST_TEST(state.selected_settings_index == vamp_zero::settings_row::tempo);
   state = vamp_zero::apply_app_command(std::move(state), vamp_protocol::page_command::SELECT);
   BOOST_TEST(state.audio.tempo_editing);
   state = vamp_zero::apply_app_command(std::move(state), vamp_protocol::page_command::NEXT);
@@ -179,7 +185,7 @@ BOOST_AUTO_TEST_CASE(settings_menu_toggles_audio_settings_and_edits_tempo) {
 BOOST_AUTO_TEST_CASE(remote_display_reports_settings_without_a_catalog_dump) {
   auto state = navigation_state();
   state.mode = vamp_zero::app_mode::SETTINGS_MENU;
-  state.selected_settings_index = 3U;
+  state.selected_settings_index = vamp_zero::settings_row::tempo;
   state.audio.backing_enabled = true;
   state.audio.metronome_enabled = true;
   state.audio.tempo_bpm = 110;
@@ -291,7 +297,7 @@ BOOST_AUTO_TEST_CASE(database_reload_preserves_all_generated_song_parts) {
   auto expected = std::size_t{};
   for (auto const &entry : std::filesystem::directory_iterator{std::filesystem::path{VAMP_TEST_SOURCE_DIR} / "data/songs"}) {
     if (entry.is_regular_file() && entry.path().extension() == ".xml") {
-      expected += 3U;
+      expected += 5U;
     }
   }
   BOOST_REQUIRE(expected > 0U);

tests/test_catalog.py

@@ -16,8 +16,8 @@ class CatalogTests(unittest.TestCase):
       source, output = pathlib.Path(temporary) / 'songs', pathlib.Path(temporary) / 'output'
       source.mkdir()
       (source / 'song.xml').write_text(tests.test_musicxml.xml_score('<harmony><root><root-step>E</root-step><root-alter>-1</root-alter></root><kind>major</kind></harmony>' + tests.test_musicxml.xml_note('E', alter=-1), '<key><fifths>-3</fifths></key>'))
-      self.assertEqual(generator.production.generate_tree(source, output), 3)
-      self.assertEqual({p.name for p in output.iterdir()}, {'song_acoustic.json', 'song_electric.json', 'song_vocal.json'})
+      self.assertEqual(generator.production.generate_tree(source, output), 5)
+      self.assertEqual({p.name for p in output.iterdir()}, {'song_acoustic.json', 'song_acoustic_improv.json', 'song_electric.json', 'song_electric_improv.json', 'song_vocal.json'})
       for path in output.iterdir():
         metadata = json.loads(path.read_text())['metadata']
         self.assertEqual(metadata['key_signature'], 'Eb')

tests/test_catalog_database.py

@@ -145,3 +145,28 @@ class CatalogTests(unittest.TestCase):
       self.assertFalse(connection.in_transaction)
       self.assertEqual(connection.execute("SELECT name FROM sqlite_schema").fetchall(), [])
       self.assertEqual(connection.execute('PRAGMA application_id').fetchone()[0], 0)
+
+  def test_solo_variant_metadata_and_required_pairs(self):
+    for enabled in (True, False):
+      document = bundle(part='Acoustic')
+      document['music']['metadata'].update(song_id='tune', solos_enabled=enabled)
+      document['music']['staves'][0]['arranged'] = True
+      write_score(self.root, 'songs/tune_acoustic' + ('' if enabled else '_improv') + '.json', document)
+    generator.catalog.build_catalog(self.root)
+    self.assertEqual([row['solos_enabled'] for row in self.rows('songs')], [1, 0])
+    saved = (self.root / 'catalog.db').read_bytes()
+    alternate = self.root / 'songs/tune_acoustic_improv.json'
+    document = json.loads(alternate.read_text())
+    for value in ('false', 0, None):
+      document['music']['metadata']['solos_enabled'] = value
+      alternate.write_text(json.dumps(document))
+      with self.assertRaisesRegex(ValueError, 'boolean'):
+        generator.catalog.build_catalog(self.root)
+    document['music']['metadata']['solos_enabled'] = True
+    alternate.write_text(json.dumps(document))
+    with self.assertRaisesRegex(ValueError, 'solo variants'):
+      generator.catalog.build_catalog(self.root)
+    alternate.unlink()
+    with self.assertRaisesRegex(ValueError, 'solo variants'):
+      generator.catalog.build_catalog(self.root)
+    self.assertEqual((self.root / 'catalog.db').read_bytes(), saved)

tests/test_catalog_runtime.cpp

@@ -284,8 +284,8 @@ BOOST_AUTO_TEST_CASE(catalog_reload_uses_cached_metadata_without_parsing_score_j
   BOOST_REQUIRE(db.build());
   // Complete cached metadata must not require parsing or retaining the score body.
   db.query("INSERT INTO songs(id, title, composer, source_json, part, source_path, "
-           "key_signature, measure_count, total_pages, title_image) "
-           "VALUES('tune', 'Metadata Song', 'Composer', '{\"presentation\":{\"playback_pages\":[{},{},{}]}}', 'Lead', 'songs/tune.json', 'F', 3, 2, '0000000000000000000000000000000000000000000000000000000000000000')");
+           "key_signature, measure_count, total_pages, title_image, solos_enabled) "
+           "VALUES('tune', 'Metadata Song', 'Composer', '{\"presentation\":{\"playback_pages\":[{},{},{}]}}', 'Lead', 'songs/tune.json', 'F', 3, 2, '0000000000000000000000000000000000000000000000000000000000000000', 1)");
   auto songs = db.rows("songs");
   for (auto attempt = std::uint32_t{}; attempt < 2U; ++attempt) {
     auto performance = db.performance();
@@ -303,6 +303,31 @@ BOOST_AUTO_TEST_CASE(catalog_reload_uses_cached_metadata_without_parsing_score_j
   BOOST_TEST(song.error().code() == static_cast<std::int32_t>(vamp_zero::error_code::INVALID_ARGUMENT));
 }
 
+BOOST_AUTO_TEST_CASE(catalog_loads_solo_variants_and_rejects_incomplete_pairs) {
+  auto db = catalog_database{};
+  for (auto enabled : {true, false}) {
+    auto value = boost::json::parse(catalog_bundle("Variants", "C", "Acoustic"));
+    value.at("music").at("metadata").as_object()["solos_enabled"] = enabled;
+    value.at("music").at("staves").as_array().front().as_object()["arranged"] = true;
+    db.write(enabled ? "songs/acoustic.json" : "songs/acoustic_improv.json", boost::json::serialize(value));
+  }
+  BOOST_REQUIRE(db.build());
+  BOOST_REQUIRE(run_catalog_operation(vamp_zero::async_validate_database, db.config, true));
+  auto loaded = db.performance();
+  BOOST_REQUIRE(loaded);
+  BOOST_REQUIRE_EQUAL(loaded->parts.size(), 2U);
+  BOOST_TEST(loaded->parts[0].solos_enabled);
+  BOOST_TEST(!loaded->parts[1].solos_enabled);
+  auto score = db.score("acoustic_improv");
+  BOOST_REQUIRE(score);
+  BOOST_TEST(!boost::json::parse(score->source_json).at("music").at("metadata").at("solos_enabled").as_bool());
+  db.query("DELETE FROM songs WHERE solos_enabled = 0");
+  BOOST_TEST(!run_catalog_operation(vamp_zero::async_validate_database, db.config, true));
+  BOOST_REQUIRE(db.build());
+  db.query("ALTER TABLE songs DROP COLUMN solos_enabled");
+  BOOST_TEST(!run_catalog_operation(vamp_zero::async_validate_database, db.config, false));
+}
+
 BOOST_AUTO_TEST_CASE(catalog_validation_rejects_missing_incompatible_and_corrupt_files_without_repair) {
   auto db = catalog_database{};
   auto validate = [&] { return run_catalog_operation(vamp_zero::async_validate_database, db.config, true); };

tests/test_engraving_cache.py

@@ -366,7 +366,7 @@ class EngravingCacheTests(unittest.TestCase):
     self.assertEqual(original, self.files(output))
     self.assertFalse((output / 'solo_xml').exists())
     self.assertFalse(list(output.rglob('*.xml')))
-    self.assertEqual(len(list(output.glob('print/*.pdf'))), 3)
+    self.assertEqual(len(list(output.glob('print/*.pdf'))), 5)
     with unittest.mock.patch('generator.printing.generate_tree', side_effect=ValueError('print rendering failed')):
       with self.assertRaisesRegex(ValueError, 'print rendering failed'):
         generator.__main__.generate_assets(args)

tests/test_guitar.py

@@ -248,12 +248,12 @@ class GuitarTests(unittest.TestCase):
     for content, attributes in [(tests.test_musicxml.xml_note(), '<clef><sign>TAB</sign></clef>'), (tests.test_musicxml.xml_note(extra='<notations><technical><fingering>1</fingering></technical></notations>'), '')]:
       with self.assertRaisesRegex(ValueError, 'authored TAB'):
         tests.test_musicxml.parse(tests.test_musicxml.xml_score(content, attributes))
-  def test_three_parts_are_deterministic_without_transposition(self):
+  def test_five_bundles_are_deterministic_without_transposition(self):
     with tempfile.TemporaryDirectory() as temporary:
       source, output = pathlib.Path(temporary) / 'source', pathlib.Path(temporary) / 'output'
       source.mkdir()
       (source / '0000.xml').write_text(tests.test_musicxml.xml_score('<harmony><root><root-step>E</root-step><root-alter>-1</root-alter></root><kind>major</kind></harmony>' + tests.test_musicxml.xml_note('E', alter=-1), '<key><fifths>-3</fifths></key>'))
-      self.assertEqual(generator.production.generate_tree(source, output), 3)
+      self.assertEqual(generator.production.generate_tree(source, output), 5)
       first = {p.name: p.read_bytes() for p in output.rglob('*.json')}
       generator.production.generate_tree(source, output)
       self.assertEqual(first, {p.name: p.read_bytes() for p in output.rglob('*.json')})

tests/test_improvisation.py

@@ -0,0 +1,109 @@
+"""Improvisation replaces source-allocated solos, including their pickups."""
+import copy
+import fractions
+import pathlib
+import unittest
+
+import generator.arrange.assembly
+import generator.arrange.form
+import generator.arrange.generate
+import generator.composition
+import generator.composition_types
+import generator.engraving.fonts
+import generator.engraving.layout
+import generator.engraving.types
+import generator.model
+import generator.musicxml
+import generator.parts
+import generator.performance
+import generator.source
+import generator.validation
+import tests.production_fixtures
+import tests.solo_fixtures
+import tests.test_arrangement_pickup
+import tests.test_musicxml
+
+F = fractions.Fraction
+
+def events(document):
+  cursor = F()
+  result = []
+  for measure in document['staves'][0]['measures']:
+    for voice in measure['voices']:
+      for note in voice['notes']:
+        start = cursor + generator.model.fraction(note['onset'])
+        result.append((start, start + generator.model.fraction(note['duration']), note))
+    cursor += generator.model.fraction(measure['duration'])
+  return result
+
+class ImprovisationTests(unittest.TestCase):
+  def setUp(self):
+    tests.production_fixtures.install(self)
+
+  def check_variants(self, document):
+    source = generator.source.SourceAnalysis.read(generator.parts.prepare_document(document))
+    results = {r: generator.composition.generate_role(source, r, pathlib.Path('data')) for r in generator.composition_types.ROLES}
+    before = copy.deepcopy(results)
+    written = generator.arrange.assembly.assemble(source, results)
+    improv = generator.arrange.assembly.assemble(source, results, solos_enabled=False)
+    self.assertEqual(results, before)
+    self.assertEqual(written['vocal'], improv['vocal'])
+    for part in ('acoustic', 'electric'):
+      windows = [(a, b) for a, b, role in generator.arrange.form.windows(source.document(), part) if role == part + '_solo']
+      actual = events(improv[part])
+      slashes = [(a, b) for a, b, n in actual if n.get('notehead') == 'slash']
+      self.assertTrue(slashes)
+      for start, end in windows:
+        cursor = start
+        for a, b in slashes:
+          if start <= a < end:
+            self.assertEqual(a, cursor)
+            self.assertLessEqual(b, end)
+            cursor = b
+        self.assertEqual(cursor, end)
+      self.assertFalse([n for a, b, n in actual if n['pitches'] and any(a < end and b > start for start, end in windows)])
+      outside = lambda doc: [(a, b, n) for a, b, n in events(doc) if not any(a < end and b > start for start, end in windows)]
+      self.assertEqual(outside(written[part]), outside(improv[part]))
+      for a, b in zip(written[part]['staves'][0]['measures'], improv[part]['staves'][0]['measures']):
+        for key in ('harmonies', 'section_label', 'number', 'duration', 'attributes'):
+          self.assertEqual(a.get(key), b.get(key), key)
+      self.assertEqual(generator.performance.timing(written[part]), generator.performance.timing(improv[part]))
+      generator.validation.validate_document(improv[part])
+    return improv
+
+  def test_no_pickup_and_simple_meters(self):
+    for meter in (3, 4, 5):
+      with self.subTest(meter=meter):
+        self.check_variants(tests.solo_fixtures.song(count=2, meter=meter, chords=('CM7',)))
+
+  def test_partial_pickup_includes_allocated_rests_and_preserves_earlier_music(self):
+    pickup = '<note><rest/><duration>1</duration><type>eighth</type></note>' + tests.test_musicxml.xml_note('D', 1, 'eighth')
+    self.check_variants(tests.test_arrangement_pickup.source(pickup, divisions=2))
+
+  def test_repertoire_pickup_allocations(self):
+    for song, first in (('all-of-me', (288, 416)), ('autumn_leaves', (284, 412))):
+      with self.subTest(song=song):
+        variants = self.check_variants(generator.musicxml.load_musicxml(pathlib.Path('data/songs') / (song + '.xml')))
+        for part, expected in zip(('acoustic', 'electric'), first):
+          slashes = [(a, b) for a, b, n in events(variants[part]) if n.get('notehead') == 'slash']
+          self.assertEqual(slashes[0][0], expected)
+          self.assertTrue(all(b - a == 1 for a, b in slashes))
+
+  def test_meter_changes_and_compound_beats_render_in_staff_and_tab(self):
+    change = '<attributes><time><beats>6</beats><beat-type>8</beat-type></time></attributes>'
+    document = tests.test_musicxml.parse(tests.test_musicxml.xml_score(tests.test_musicxml.xml_note(duration=1, kind='quarter') + change + tests.test_musicxml.xml_note(duration=3, kind='half', extra='<dot/>')))
+    source = generator.source.SourceAnalysis.read(generator.parts.prepare_document(document))
+    template = generator.arrange.generate._arrange_document(source.document(), 'acoustic', owned={'slash'})
+    template['staves'][0]['tablature'] = True
+    result = generator.arrange.assembly.improvisation(source, template, 'acoustic')
+    result['metadata']['solos_enabled'] = False
+    solo = next(m for m in result['staves'][0]['measures'] if m.get('section_label') == 'Acoustic Solo')
+    self.assertEqual([generator.model.fraction(n['duration']) for n in solo['voices'][0]['notes']], [1, F(3, 2), F(3, 2)])
+    generator.validation.validate_document(result)
+    fonts = generator.engraving.fonts.Fonts(pathlib.Path('package/assets/fonts/petaluma'))
+    layout = generator.engraving.layout.layout_score(result, generator.engraving.types.Style(), fonts)
+    primitives = [p for page in layout.pages for p in page.primitives]
+    self.assertEqual(sum(p.role == 'slash' for p in primitives), 3)
+    self.assertEqual(sum(p.role == 'tab_slash' for p in primitives), 3)
+    self.assertFalse(any(p.role in ('tab', 'head') for p in primitives))
+    self.assertTrue(any(p.role == 'subtitle' and 'Improvisation' in p.value for p in primitives))

tests/test_menu.cpp

@@ -8,7 +8,9 @@
 #include <vamp_zero/control.hpp>
 #include <vamp_zero/library.hpp>
 #include <vamp_zero/menu_view.hpp>
+#include <vamp_zero/navigation.hpp>
 #include <vamp_zero/page_control.hpp>
+#include <vamp_zero/score_loader.hpp>
 
 
 namespace {
@@ -44,14 +46,14 @@ BOOST_AUTO_TEST_CASE(menu_actions_share_navigation_and_preserve_settings_focus)
   BOOST_TEST(!state.audio.backing_enabled);
   state = vamp_zero::apply_menu_action(state, action(state, 2U));
   BOOST_TEST(state.audio.metronome_enabled);
-  state = vamp_zero::apply_menu_action(state, action(state, 3U));
+  state = vamp_zero::apply_menu_action(state, action(state, vamp_zero::settings_row::tempo));
   BOOST_TEST(state.audio.tempo_editing);
   state = vamp_zero::apply_menu_action(state, action(state, 0U));
   BOOST_CHECK(state.mode == vamp_zero::app_mode::MAIN_MENU);
   BOOST_TEST(!state.audio.tempo_editing);
   state = vamp_zero::apply_app_command(state, vamp_protocol::page_command::SELECT);
   BOOST_CHECK(state.mode == vamp_zero::app_mode::SETTINGS_MENU);
-  BOOST_TEST(state.selected_settings_index == 3U);
+  BOOST_TEST(state.selected_settings_index == vamp_zero::settings_row::tempo);
   BOOST_TEST(!state.audio.tempo_editing);
   BOOST_TEST(!state.audio.backing_enabled);
   BOOST_TEST(state.audio.metronome_enabled);
@@ -70,7 +72,7 @@ BOOST_AUTO_TEST_CASE(menu_touch_activates_once_on_release_and_stepper_has_priori
   BOOST_CHECK(state.mode == vamp_zero::app_mode::SETTINGS_MENU);
   BOOST_TEST(!state.audio.backing_enabled);
   BOOST_CHECK(!touch.handle(point_event(luma::touch_phase::UP, point, now), menu_bounds, state));
-  point = row_center(state, 3U, vamp_zero::menu_action_kind::TEMPO_UP);
+  point = row_center(state, vamp_zero::settings_row::tempo, vamp_zero::menu_action_kind::TEMPO_UP);
   touch.handle(point_event(luma::touch_phase::DOWN, point, now), menu_bounds, state);
   tapped = touch.handle(point_event(luma::touch_phase::UP, point, now + std::chrono::milliseconds{40}), menu_bounds, state);
   BOOST_REQUIRE(tapped);
@@ -79,11 +81,11 @@ BOOST_AUTO_TEST_CASE(menu_touch_activates_once_on_release_and_stepper_has_priori
   BOOST_TEST(state.audio.tempo_bpm == 120U);
   BOOST_TEST(!state.audio.tempo_editing);
   for (auto i = 0U; i < 100U; ++i) {
-    state = vamp_zero::apply_menu_action(state, action(state, 3U, vamp_zero::menu_action_kind::TEMPO_DOWN));
+    state = vamp_zero::apply_menu_action(state, action(state, vamp_zero::settings_row::tempo, vamp_zero::menu_action_kind::TEMPO_DOWN));
   }
   BOOST_TEST(state.audio.tempo_bpm == 60U);
   for (auto i = 0U; i < 100U; ++i) {
-    state = vamp_zero::apply_menu_action(state, action(state, 3U, vamp_zero::menu_action_kind::TEMPO_UP));
+    state = vamp_zero::apply_menu_action(state, action(state, vamp_zero::settings_row::tempo, vamp_zero::menu_action_kind::TEMPO_UP));
   }
   BOOST_TEST(state.audio.tempo_bpm == 120U);
 }
@@ -167,8 +169,79 @@ BOOST_AUTO_TEST_CASE(pico_settings_parser_rejects_invalid_values_without_mutatin
   auto state = vamp_pico::remote_display_state{};
   BOOST_REQUIRE(vamp_pico::parse_remote_display_body("mode=settings_menu\nfocus=Backing\nbacking=1\nbpm=135\n", state));
   auto before = state;
-  for (auto text : {"bpm=0\n", "bpm=401\n", "bpm=-1\n", "editing=yes\n", "backing=2\n", "metronome=true\n", "focus=abcdefghijklmnopqrstuvwxyz0123456789\n"}) {
+  for (auto text : {"bpm=0\n", "bpm=401\n", "bpm=-1\n", "editing=yes\n", "backing=2\n", "metronome=true\n", "solos=2\n", "solos=false\n", "focus=abcdefghijklmnopqrstuvwxyz0123456789\n"}) {
     BOOST_CHECK(!vamp_pico::parse_remote_display_body(text, state));
     BOOST_CHECK(state == before);
   }
 }
+
+BOOST_AUTO_TEST_CASE(solos_toggle_selects_variants_and_preserves_global_choice) {
+  auto parts = std::vector<vamp_zero::library_part>{};
+  for (auto song : {"First", "Second"}) {
+    for (auto name : {"Acoustic", "Electric", "Vocal"}) {
+      for (auto enabled : {true, false}) {
+        if (std::string_view{name} == "Vocal" && !enabled) {
+          continue;
+        }
+        parts.push_back({.id = std::string{song} + name + (enabled ? "" : "_improv"), .title = song, .part = name,
+          .total_pages = enabled ? 4U : 2U, .playback_pages = enabled ? 8U : 3U, .solos_enabled = enabled});
+      }
+    }
+  }
+  auto state = vamp_zero::app_state{.catalog = std::make_shared<vamp_zero::catalog const>(vamp_zero::group_ordered_parts(std::move(parts)))};
+  BOOST_TEST(state.solos_enabled);
+  state = vamp_zero::apply_menu_action(state, action(state, 1U));
+  auto touch = vamp_zero::menu_touch{};
+  auto point = row_center(state, vamp_zero::settings_row::solos);
+  auto now = std::chrono::steady_clock::now();
+  touch.handle(point_event(luma::touch_phase::DOWN, point, now), menu_bounds, state);
+  auto tapped = touch.handle(point_event(luma::touch_phase::UP, point, now + std::chrono::milliseconds{40}), menu_bounds, state);
+  BOOST_REQUIRE(tapped);
+  state = vamp_zero::apply_menu_action(state, *tapped);
+  BOOST_TEST(!state.solos_enabled);
+  BOOST_TEST(!state.audio.tempo_editing);
+  BOOST_TEST(vamp_zero::menu_row(state, vamp_zero::settings_row::solos).detail == "Off");
+  auto remote = vamp_pico::remote_display_state{};
+  BOOST_REQUIRE(vamp_pico::parse_remote_display_body(vamp_zero::remote_display_text(state), remote));
+  BOOST_TEST(std::string{remote.focus} == "Solos");
+  BOOST_TEST(!remote.solos);
+  auto before = remote;
+  remote.solos = true;
+  BOOST_CHECK(!(before == remote));
+  state = vamp_zero::apply_menu_action(state, action(state, 0U));
+  state = vamp_zero::apply_menu_action(state, action(state, 0U));
+  for (auto song = 1U; song <= 2U; ++song) {
+    state = vamp_zero::apply_menu_action(state, action(state, song));
+    BOOST_TEST(vamp_zero::menu_count(state) == 4U);
+    for (auto row = 1U; row <= 3U; ++row) {
+      BOOST_TEST(vamp_zero::menu_row(state, row).label == (row == 1U ? "Acoustic" : row == 2U ? "Electric" : "Vocal"));
+      state = vamp_zero::apply_menu_action(state, action(state, row));
+      auto reference = vamp_zero::selected_score_reference(state);
+      BOOST_REQUIRE(reference);
+      BOOST_TEST(reference->id.ends_with("_improv") == (row != 3U));
+      BOOST_TEST(vamp_zero::active_pages(state) == (row == 3U ? 4U : 2U));
+      for (auto i = 0; i < 10; ++i) {
+        state = vamp_zero::apply_app_command(state, vamp_protocol::page_command::NEXT);
+      }
+      BOOST_TEST(state.page_index == vamp_zero::active_pages(state) - 1U);
+      state.audio.metronome_enabled = true;
+      BOOST_TEST(vamp_zero::active_pages(state) == (row == 3U ? 8U : 3U));
+      state = vamp_zero::apply_app_command(state, vamp_protocol::page_command::SELECT);
+      state.audio.metronome_enabled = false;
+      BOOST_TEST(!state.solos_enabled);
+    }
+    state = vamp_zero::apply_menu_action(state, action(state, 0U));
+  }
+  state = vamp_zero::apply_menu_action(state, action(state, 0U));
+  state = vamp_zero::apply_menu_action(state, action(state, 1U));
+  BOOST_TEST(state.selected_settings_index == vamp_zero::settings_row::solos);
+  state = vamp_zero::apply_app_command(state, vamp_protocol::page_command::SELECT);
+  BOOST_TEST(state.solos_enabled);
+  state = vamp_zero::apply_menu_action(state, action(state, 0U));
+  state = vamp_zero::apply_menu_action(state, action(state, 0U));
+  state = vamp_zero::apply_menu_action(state, action(state, 1U));
+  state = vamp_zero::apply_menu_action(state, action(state, 1U));
+  BOOST_TEST(state.active_part_id == "FirstAcoustic");
+  BOOST_REQUIRE(vamp_zero::validate_app_state(state));
+  BOOST_TEST(vamp_zero::app_state{}.solos_enabled);
+}

tests/test_parts.py

@@ -161,5 +161,5 @@ class PartGenerationTests(unittest.TestCase):
       with self.assertRaisesRegex(ValueError, 'broken.xml'):
         generator.__main__.generate_assets(args)
       self.assertEqual(original, {p.relative_to(args.output_dir): p.read_bytes() for p in args.output_dir.rglob('*') if p.is_file()})
-      self.assertEqual(len(list(args.output_dir.rglob('*.json'))), 6)
+      self.assertEqual(len(list(args.output_dir.rglob('*.json'))), 10)
       self.assertEqual(json.loads((args.output_dir / 'songs/song_vocal.json').read_text())['metadata']['title'], 'Fixture')

tests/test_ui.cpp

@@ -205,7 +205,12 @@ BOOST_AUTO_TEST_CASE(device_menu_rendering_uses_petaluma_and_fits_both_displays)
   state.audio.backing_enabled = true;
   state.audio.metronome_enabled = true;
   preview(state, "settings");
-  state.selected_settings_index = 3U;
+  state.selected_settings_index = vamp_zero::settings_row::solos;
+  preview(state, "solos_on");
+  state.solos_enabled = false;
+  preview(state, "solos_off");
+  state.solos_enabled = true;
+  state.selected_settings_index = vamp_zero::settings_row::tempo;
   state.audio.tempo_editing = true;
   preview(state, "tempo");
   state.audio.tempo_editing = false;