The pi zero hardware supports gadget mode and from there it's a bit more work to get it to enumerate as a midi device. The pi 4 supports this via the usb-c port

The pi zero hardware supports gadget mode and from there it's a bit more work to get it to enumerate as a midi device. The pi 4 supports this via the usb-c port. https://raspberrypi.stackexchange.com/questions/71613/how-to-use-raspberry-pi-3-as-a-usb-gadget https://raspberrypi.stackexchange.com/questions/71613/how-to...