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@wanno2 Ah, I see. I also don't have much experience playing it 😂 I think it depends on how to distribute notes on the grid. With LED communicating note, you can move the notes to use the area you need into the center so 2 can be enough. But maybe a bigger version is needed ;)
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@wanno2 ah, if you want chromatic / microtonal music, probably you want at least 3. I use this only for western traditional tuning so far, so need less keys.