Setup GarageBand Input/Output:
On the top left menu open GarageBand->Preferences
Click on the “Audio/Midi” tab.
Set the Output Device to “CASTER Stream Mix”
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:
Hit the Add Microphone button and Add your Microphone.
Choose your Monitor device to hear your stream:
Set Google Meet Microphone to “CASTER Stream Mix”
Join Google Meet.
Allow whatever microphone initially. We will change it in the next step.
In the bottom left select the options menu with the 3 dots and select settings.
Change the Microphone to “CASTER Stream Mix”