The EMU Xboard MIDI controller is GREAT to build DIY synths with, since it uses an Atmega48 as the front panel controller. The pinouts are also easy peasy and offer enough flexibility. On top of that you get a semi-weighted keyboard with velocity and aftertouch! Lotsa bang for your DIY buck :)
Website page: https://www.evilturtle.nl/projects/sq...
Arduino library: https://github.com/MCUdude/MiniCore
Scanning a key matrix: • How The 4x4 Keypad Matrix Works - A Tutori...
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