I have an Allen & Heath MixWiz 16 with 6 monitor sends. I want to use it to record some multitrack demos onto my PC. I guess I can mix 4 drum mics into monitor send A Bass into monitor send B Vocal into monitor send C MP3 player into monitor send D and run those 4 into a USB interface to the computer. I've never seen a recording interface, I know literally nothing about them. Do I need 4 free USB ports, one for each track? Does the interface multiplex the 4 tracks into one USB port? If multiplexing, is there a standard protocol for doing that, i.e. can I count on my DAW software being able to demux the tracks and give me true multitrack on the computer? Do I have to worry about which interface is compatible with which DAW software (I'm a Linux person so Ardour would be the DAW software) Are the multiple tracks automatically timesynced? I basically just want to get those 4 tracks onto the computer and synced so I can set the levels in software. I've previously gone from the board's headphone jack (unbalanced) into the mic jack in the soundcard, but in that case everything is in one track and the balance, EQ and effects are taken straight off the board post-faders. I'm looking to take the cooking off the board and do it in the puter. Thanks!