I have made a crucial mistake on the keyboard PCB. The second line of instrument buttons is connected to select line 1 instead of 2, meaning both rows map to the same keys :-( This has to be fixed by cutting a line on the keyboard and connecting it manually to select line 2. Bummer.
Also, SEL9 and 10, going to the keypad, are not working properly. This could be just the cable though.
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