Some time ago I started rebuilding my modular synth and I decided to go towards the multi-module route. This is my last work: XFM2 (FM Synth) plus MIDI Thru, MIDI2CV, a LPG
$6 ] DIY modular synth FM VCO with arduino mozzi library | 2 operational FM synthesizer - YouTube
Synth Trek, Ep 2 • Barton's Recipe | Beginner FM Modular Synthesizer Tutorial - YouTube
5 of the best FM synths - Tech - Mixmag
OpZilla FM Synthesizer | 2getheraudio | Music Production Software