This article explains how to broadcast on Mixlr using Dj software - 'Virtual DJ' and an external MIDI controller - 'Hercules DJ Console MK 4'. (Tip - These instructions can be translated to almost any external controller or audio interface.)
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In the first window, select the 'Headphones (dual soundcards)' option, then select 'more' at the bottom of the window:
Make the following 'output' and 'sound card' selections in the next window:
Select the Hercules as your audio source:
Simply physically route 'Output 1-2' to 'Input 1-2' on the Hercules using a phono to phono cable: