pcb board Hersteller
https://jlcpcb.com/
shik
Leonardo
https://www.bastelgarage.ch/dreamer-nano-arduino-leonardo-kompatibles-board?search=Arduino%20Micro&limit=75
Musik Ding
https://www.musikding.de/PedalPCB-Delay
DIY Mic
Loopy Pro Plugins
https://www.kvraudio.com/plugins/ios-aaudio-apps
https://synthyfrog.com/technology-is-audiounit/type-is-effect/
diy audio
Spark Micro Pro to Midi
https://www.hackster.io/dennis-v/usb-midi-adapter-e6ee57
more midi