     func turnOffHeldKeys() {
         updateAllKeysToUpPosition()
         
-        for note in midiNotesHeld {
+        for note in 21...108 {
             conductor.core.stopNote(note)
         }
     

    func toggleMonoKeyHeld(key: UIButton) {
        if midiNotesHeld.contains(midiNoteFromTag(key.tag)) {
            midiNotesHeld.removeAll()
            midiNotesHeld.append(midiNoteFromTag(key.tag))
        } else {
            midiNotesHeld.removeAll()
        }
    }
    

        
        if holdMode && monoMode {
           toggleMonoKeyHeld(key)
           redisplayHeldKeys()
        } else if holdMode && !monoMode {
            toggleKeyHeld(key)
            
        } else {
            turnOffKey(key)
        }
    }
    
    // *********************************************************
