Ok, one other issue is that CPY and PST also operate mute for track 1 and O. But I just think that the mute light should have priority: We will not see the orange CPY/PST lights if we have track 1/O muted. Apart from that I dont think there is any problem: If only CPY is pressed, track 1 mute is toggled, and if a step button is held while pressing CPY it will copy the step.