GitHub - maltman23/ArduTouch: ==> ARDUTOUCH KITS ARE AVAILABLE at CornfieldElectronics.com <== ArduTouch is an Arduino-compatible music synthesizer kit with a built-in touch keyboard, and with built-in speaker/amplifier. Build it, and it works!
A Synth Of Your Own, For Not A Lot | Hackaday
The ZT-2020 is a portable SunVox synth | Arduino Blog
Arduino-based MIDI controller brings Minimoog Model D synthesizer back to life (Crowdfunding) - CNX Software
Groovesizer | DIY Synthesizer & Sequencer Kits
Creating a DCO-based Audio Synthesizer With an Arduino Nano - Projects