I built the ardutouch and it was a fun experience: https://notes.atomutek.org/diy-music-synth.html https://notes.atomutek.org/diy-music-synth.html I recommend

I built the ardutouch and it was a fun experience: https://notes.atomutek.org/diy-music-synth.html https://notes.atomutek.org/diy-music-synth.html I recommend it for a first hardware project.