Setup GarageBand Input/Output:
Open GarageBand.
On the top left menu open GarageBand->Preferences
Click on the “Audio/Midi” tab.
Set the Output Device to “CASTER”
Leave the input Device set to your audio interface.
Setup CASTER application:
Open CASTER application – installed in your Application folder.
Hit the Add application button and Add GarageBand to CASTER tracks:
