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UMIDI(4) Device Drivers Manual UMIDI(4)

USB MIDI devices

umidi* at uhub?
midi* at umidi?

The umidi driver supports USB MIDI devices that follow the USB MIDI standard. It also supports the following vendor specific devices:
Roland UM1
Yamaha UX256
Yamaha UX96
other Yamaha MIDI devices (hopefully)
The umidi driver is accessible through the midi(4) driver.

midi(4), uhub(4), usb(4)

The umidi driver appeared in OpenBSD 3.2.

Some USB MIDI devices provide a switch for selecting between a vendor specific mode and standard USB MIDI mode. Selecting standard USB MIDI mode may allow a device to attach as umidi rather than ugen(4). This is particularly true for Roland branded devices.
June 26, 2008 OpenBSD-5.6