> ## Documentation Index
> Fetch the complete documentation index at: https://help.ondeckapps.com/llms.txt
> Use this file to discover all available pages before exploring further.

# MIDI: trigger and control Relay workflows

> Configure MIDI receive and send workflows in Relay on Mac.

Relay can receive and send MIDI on Mac.

## Enable MIDI receive

1. Open `Relay > Settings`.
2. Select `External Control`.
3. Switch to `MIDI`.
4. Turn on `MIDI Input`.
5. Choose all sources or a specific input.
6. Refresh the device list if a device was just connected.

## Use MIDI in Relay

* MIDI Receive triggers in Automation View
* MIDI Send actions in Automation View
* MIDI-based scene recall workflows
* Timecode display workflows
* DAW Transport module workflows

The `External Control` page also shows message counts and the last received MIDI event, which makes it much easier to verify routing before you build an automation.

## Troubleshooting

If MIDI triggers do not fire, confirm the correct input source is selected and that the sending device is emitting the message type you expect.