a couple of resistors and a MIDI connector. After testing his simple circuit on a bread board, he managed to squeeze it all inside an old USB dongle housing, stuffing it in dead-bug style.

Your MIDI keyboard should now be successfully interfaced with your computer, potentially via your audio interface. This ...

and will automatically map every MIDI device onto every other MIDI device. On my raspberry pi I set a udev rule (committed in this repository) to fire whenever any USB device is plugged in and run the ...

and a MIDI DIN shield. This project uses an Adafruit Trinket M0 which has USB host capability. The USB Host Library for SAMD and a USB OTG to USB host cable or adapter is required.