I’ve made this GitHub - aieoua/midi2gate: Converting MIDI notes to analog gate outputs
It is midi2gate converter and supports “polyphony” gates which nice works with drummer (6 outputs). You can easily assign midi notes to outputs only with two buttons. Also you can set midi channel via dip switch. Schematic, code and gerber files included.
It is based on atmega328p but you can make it work on arduino nano 168p as well
Hope someone will find it useful.