Because sometime pitchSet inequality causes a problem (Tonic issue)

Author: aure

Sources/Keyboard/KeyboardModel.swift

@@ -23,7 +23,7 @@ class KeyboardModel: ObservableObject {
                     newPitches.add(p)
                 }
             }
-            if touchedPitches != newPitches {
+            if touchedPitches.array != newPitches.array {
                 touchedPitches = newPitches
             }
         }