I know this is possible on a PC, but every audio card I look at closely says its impossible on a mac. (let me know if I am wrong please!!!) I want to record into my computer 4 tracks of audio at one. on a PC you would use a card such as a "delta 44" in conjunction with a program like cubase to do this. But I took a close look at the owners manual for the delta 44 and it seems to imply you can only record 2 tracks in (or one set of stereo) at a time. You see I have old "4 track" tapes I want to edit on the mac, but due to the fact that they are analogue, they never record at exactly the same speed twice so I cant record into my computer 2 sets of 2 tracks and sync em up (believe me Ive tried!!) check out my diagram if you are confused about what i want to do: http://angryjim.com/storage/audioimpossible.jpg HEELLLLLLLP!!