I'm just getting started with DJing on my Mac and am using the Mixtrack Pro II for now to get me started. The way this mixer works is there are 4 channels, the main speaker output been channels 1 and 2, and the headphones are channels 3 and 4. What I'm wanting to do is set VoiceOver to speak through channels 3 and 4, where my headphones would be, that way I don't have to keep taking my headphones off and listen to VoiceOver to hear what track I'm selecting.

Soundflower allowed me to do this no problem, until I made the mistake of upgrading to El Capitan. Is there a way to do this with Loopback?

Really hope this makes sense, and cheers for any help.