Actually still working Analog from 80th.

69 – Stops mechanical switch ON/OFF (not push button) 1 contact
+3mm green led to indicate that is on

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16 preset buttons, +Set
7 thumb – PP, T + Set
5 thumb – transpose -3, +2

What would you use?

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Keyboards

Keyboards are in 8×8 matrix
but instead 61 keys being 1-61 (of 64)
it start (bottom C) on 4-64

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Stops

Stops in 8×8 matrix

And green LEDs

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