I recently implemented USB MIDI input and output (but not at the same time) on the ZX Spectrum Next using the Raspberry Pi.
Video about receiving:
Blog post about receiving: https://solhsa.com/#USBMIDIONZXSPECTRUMNEXT
Video about sending:
Blog post about sending: https://solhsa.com/#SENDINGMIDIDATAONZXSPECTRUMNEXT
Binaries: https://solhsa.com/zip/nextpi-usbmidi22092023.zip
Source code: https://github.com/jarikomppa/specnext/ ... nextpimidi
Receiving (and sending) USB MIDI on ZX Spectrum Next
Receiving (and sending) USB MIDI on ZX Spectrum Next
http://iki.fi/sol - my schtuphh
https://github.com/jarikomppa/speccy/ - 48k speccy dev
https://github.com/jarikomppa/specnext/ - specnext dev
https://github.com/jarikomppa/speccy/ - 48k speccy dev
https://github.com/jarikomppa/specnext/ - specnext dev