Soloing

tests/test_solo.py

@@ -210,6 +210,9 @@ class SoloTests(unittest.TestCase):
       old, new = before[part]['staves'][0]['measures'], parts[part]['staves'][0]['measures']
       self.assertEqual(old[:low], new[:low])
       self.assertEqual(old[high:], new[high:])
+      support = 4 if part == 'acoustic' else 3
+      first, count, _, _ = regions[support]
+      self.assertEqual(old[first:first+count],new[first:first+count])
       for section in (3, 4):
         first, count, _, _ = regions[section]
         self.assertTrue(any(n['pitches'] for m in new[first:first + count] for n in generator.score.measure_notes(m)))