Different tracks for different programs in Voicemeeter requires virtual audio outs, so a physical mixer requires physical audio outs.
You need separate sound devies for every source you want separate, they can be those cheap USB Soundcard DACs off Amazon, just be weary running that much audio through the USB ports.
1 Card for VoIP
1 Card for Music
Onboard for Desktop
Route all 3 into individual channels on the mixer using TRS Breakout cables or TRS to RCA and it will send the master bus track back through USB. Be aware that everyone in VoIP programs will hear everything your mixer is sending as there is no way to separate your mic from the master track.
In order to not have VoIP hear everything from your mixer you need AUX Sends or FX Sends, you turn up the AUX or FX send knob then AUX/FX send channel the mic into your Line In(<---Note, LINE IN, not MIC IN, Windows treats volume on them differently, you want LINE IN because the FX send is a LINE Output) on the motherboard and use that for your mic in VoIP
