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Thanks!
More octaves is the very next thing to add. Not sure about the UI though. Screen real estate is scarce. One idea is to just remove the “Piano” word and add there two buttons for octaves, or add a settings cogwheel in place of the volume that opens a pop-up with both volume and octaves. This second option is probably better in the long term if more settings are added like different instruments.
I’m open to suggestions though!
Thanks! Feel free to share it with anyone you think might be interested!