## Setup

### 1. Open Audio Midi Setup
Use Spotlight `command`+`space` and type `Audio Midi Setup`. Click on the Audio Midi Setup app to open.

![Spotlight Search for Audio Midi Setup](Images/Multi-Output/1.png)

### 2. Open Audio Devices Window
If the `Audio Devices` window does not immediately appear when opening `Audio MIDI Setup` select `Audio Devices` from the `Windows` drop down menu in `Audio MIDI Setup`.

![Audio MIDI Setup Windows Menu](Images/Multi-Output/2.png)

![Audio Device Window](Images/Multi-Output/3.png)

### 3. Create Multi-Output Device
In the lower left hand corner of the `Audio Devices` click the `+` icon. Select `Create Multi-Output Device`

![Create Multi-Output Device](Images/Multi-Output/4.png)

### 4. Select Output Devices
In the new Multi-Output device you just created select the audio devices that you want to output audio. It is highly recommended you enable `Drift Correction` for all devices except the Clock Source device.

⚠️ **IMPORTANT: Due to issues with macOS the Built-in Output (sometimes called MacBook Pro Speakers or similar) or another 2 channel audio device must be enabled and listed as the top device / primary device / clock device in the Multi-Output. If BlackHole is listed first simply uncheck and recheck the box under `Use` to change the order.** This may not be a problem in the latest

![Multi-Output Device Options](Images/Multi-Output/5.png)

### 5. Set Audio Output to Multi-Output Device
`right-click` on your Multi-Output device and select `Use This Device For Sound Output`. Audio should now be playing through your speakers and through BlackHole.

![Use This Device For Sound Output](Images/Multi-Output/6.png)

## Troubleshooting

### I can't change the volume of a Multi-Output device

Unfortunately macOS does not support changing the volume of a Multi-Output device but you can set the volume of individual devices in Audio MIDI Setup. 

### Audio and video won't play when using a MultiOutput Device.

Due to issues with macOS the Build-in Output (sometimes called MacBook Pro Speakers or similar) must be enabled and listed as the top device in the Multi-Output. If BlackHole is listed first simply uncheck and recheck the box under Use to change the order.