This article explains how to broadcast on Mixlr using DJ software - Traktor, and an external MIDI controller - Traktor S2. You'll be using Traktor to mix tracks from your PC and the S2 to control your levels crossfader.
You will find the audio preferences in Traktor's settings:
Ensure the Audio Setup settings in Traktor are as follows:
Ensure the Output Routing settings are as follows:
Open the Mixlr app. If you haven’t downloaded it yet, you can do so here.
(Tip - If you're having problems with the Mixlr app receiving audio signal, check that you have the latest Traktor drivers installed. You can download the latest drivers here.)
If you have problems - check the Volume Control within Windows to ensure the correct levels are set and that it's receiving audio from the desired sources.