I have the AR8 USB mixer with three mics connected (channels 1, 2, 3/4) but when I record, it only records to the main mix. I can't see any waves on the tracks, but I do see that it's picking up audio from each channel. I would like to be able to have the audio from each microphone on a separate track so I can edit them individually (I plan to use Reaper to edit). Thank you so much.