My set up right now:
Kind of a mess actually
I use the mixer only for gigs, I record everything through my sapphire USB 6 audio interface (behind the black gameboy). However, I am not completely satisfied with the results. I use ableton btw as recording device. Right now I am also recording bass guitar, gameboy and midi keyboard and I find it very frustrating that mixing input (my bass in this case) and playback (for instance a massive synth in ableton) sucks balls. Especially when the distorted bass guitar starts "looping" from input to playback, causing mad feedback. Any tips on what I should do different? A mixer in between the audio interface and the instruments for instance? The keyboard goes directly in the computer and not via the audio interface.