Midi synthesizer based on picoSynth by Microjack. The pinout is the same than mt32pi and also is compatible with all cores with mt32pi support. There are 3 versions: USB3 user io, DB9 user io and as Raspberry Pi Zero 2W replacement (decapod/octopod/second user io).

You can upload latest firmware from here by inserting a usb cable as mass storage device keeping button pressed while inserting the cable.