Hi there,
I’m quite new at BluePrints and searching a way to, at least, split stereo input of a microphone into 2 mono channels, and would love to ear that UE could handle multiTracks (12+) from a SoundBoard for Realtime Music Event…
Thx on advance :o)
Unreal is pretty hard coded to just use the default input device, to make it use more than one audio device would require some significant alterations in c++ in the editor source code; if your input device exposes itself as a mutlichannel input to windows it might be possible get more than 2 channels into unreal but in recent years devices it’s rather rare to find devices that show up in windows as multichannel, even multichannel devices usually just sho up as a series of stereo inputs and with unreal you can only choose one.
Most people who do live set visualizations with unreal don’t pass the audio through unreal at all, they just send OSC/MIDI and other control data to unreal and play the audio directly to the venue.
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Thx for your fast feedback 
I may dive with Midi / OSC setup in the future…
For this time, i’m gonna play filtering the Mic input of the global Mix