---
name: "umidi"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["openbsd"]
url: "https://new.carta.tech/umidi"
---

# umidi(4)

USB MIDI devices

## NAME

**umidi** – USB MIDI devices

## SYNOPSIS

**umidi\* at uhub?** **midi\*  at umidi?**

## DESCRIPTION

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)](/midi/4.md) driver.

## SEE ALSO

[midi(4)](/midi/4.md), uhub(4), [usb(4)](/usb/4.md)

## HISTORY

The **umidi** driver appeared in OpenBSD 3.2.

## CAVEATS

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)](/ugen/4.md). This is particularly true for Roland branded devices.