Virtual Audio Cable

This piece of software, not super costly, but perhaps difficult to avoid paying for, allows you to talk to two installed soundcards on your machine. In my case, I have a third-party soundcard and an original equipment manufacturer sound chip on the motherboard. Under the control panel, you can see only one of these, but with VAC you can see both, which is essential in Traktor for cue (control room) and final audio mix, one soundcard each. Virtual Audio Cable is easy to find in search, and on my machine it looks like this:

I had to guess at these settings, but the website helped and I also tested the trial first to make sure it seemed to work. Probably you'll have to guess at a bunch of settings unique to your situation. In daily use, I never see this. Just install, make sure you have sufficient sampling in your settings, plenty of cables and forget. The only reason I brought it up now is for this tutorial and so you would have an example.

These audio repeaters I configure every time I stream. In practice I need only the cue (VAC2 in, soundcard out), the mic (soundcard in, VAC3 out) and not the final mix (VAC1 in, OEM sound chip out), because I do not play to a room. I can monitor the stream with Foobar2000 to hear how it sounds to the audience. After I start, it looks like this:

The bars indicate the buffers are working. The cable selections (such as VAC2) are determined by how the stream is configured in Traktor.