Setup A Loopback Audio Device

1. Open GarageBand

2. Open Loopback

3. On the Sources column of Loopback, click the + symbol to add a new source. Select GarageBand

   

You now have an audio device on your Mac called “Loopback Audio.” If you use this as an input device, that input will be the output of GarageBand. In addition to using this as input, we want to “monitor” the device output.

Monitor Device Output

1. On the right column of Loopback, add a Monitor.
2. If you have the scarlet plugged in, you can use that as your monitor

GarageBand Audio Setup

I don’t quite remember what the output device should be, but I think it’s the scarlett. You might have to play with this option

1. Open QuickTime Player
2. Click “New Movie Recording

1. click the dropdown arrow in quicktime to bring up the input selection. Under “microphone” Select Loopback Audio

You should now have your MIDI device connected to Garageband, and looped into QuickTime. Pressing record should include all audio from the MIDI device.