I'm not using a mixer. I'm playing an MP3 within vmix and this will output to a local speaker. A local singer will sing to the MP3 over a microphone input to vmix. I want my stream output to be both the MP3 and the singer.

I don't think I should use the same audio bus to do this as there would be a feedback loop.

So, how would you do this?

MP3 output to the "A" bus and then output to an audio output on the computer. Then input the microphone on Master?

And how do I mix the MP3 into the stream?

Thanks!