So I am trying to stream my setup to Mixlr, which provides a streaming interface where I can assign an audio device to send to the stream. There are a few options in the dropdown menu for each of the Scarlett 18i20's output channels, and there is one for the Scarlett 18i20's USB channel. Now I can hear both the audio from the Ableton Live DAW and the external instruments I have plugged into the audio interface, but I can't seem to get any audio from the USB channel, and the only time I do get audio from the interface to the Mixlr stream is if I select the 18i20's channels 3/4, which is the input channel used by the external instrument.
Has anyone successfully been able to get the USB audio source from a FocusRite audio interface to provide audio to the USB device? How do I get this to work? I need to feed to the stream both the external instrument and the audio tracks within the DAW.