Download and Install CASTER app
Setup CASTER application:
Open CASTER application – installed in your Application folder.
Hit the Add application button and Add any application you choose to CASTER tracks:
Hit the Add Microphone button and Add your Microphone.
Choose your Monitor device to hear your stream:
Now all the tracks in CASTER are streamed to CASTER virtual audio device “CASTER Stream Mix”. you can choose this device as input source for any application and all the audio will be streamed to it.