I think, that if possible (with software and current hardware) that all inputs are able to be recorded at the same time which is all channel inputs, and all three stereo inputs.
It wouldn’t hurt if we could also assign the stereo USB audio signal from a mac to record on it’s own independent channel also.
I can’t imagine that there are restrictions not to record all channels 1-16 plus ST1-3 to Qu-drive. It should be on top of the CR list for next release.