Transpose

src/vamp_zero/notation.cpp

@@ -93,6 +93,13 @@ auto vamp_zero::parse_notation_document(std::string_view json, std::string sourc
     }
     document.arrangement_part_type = std::move(*type);
   }
+  if (document.arrangement_part_type == "practice" && document.key_signature == "No key" && metadata->if_contains("variant_tonic")) {
+    auto tonic = string_field(*metadata, "variant_tonic");
+    if (!tonic) {
+      return invalid(std::string{tonic.error().message()});
+    }
+    document.key_signature = *tonic + " (no key)";
+  }
   for (auto const &item : *pages) {
     if (!item.is_object()) {
       return invalid("page must be an object");

src/vamp_zero/types.cpp

@@ -57,5 +57,5 @@ auto vamp_zero::practice_key_names() -> std::vector<std::string_view> const & {
 }
 
 auto vamp_zero::practice_type_supports_key_selection(std::string_view practice_type_id) -> std::bool_t {
-  return practice_type_id == "melody";
+  return practice_type_id == "melody" || practice_type_id == "chord";
 }