Fundraising (reloaded)
...after the suggestions (thanks Wesley) I redesigned the nanodrum: without Arduino 24 inputs MIDI IN and MIDI OUT simple direct connection with LCD, 2 buttons and Wav Trigger expansion connectors shift register for the LCD (3 free digital inputs) USB port (for MIDI and firmware upload) and therefore I propose again the idea of collecting funds to print the first PCBs. The use of the shift register is well documented on the internet ...