I have Magix MM Mx Premium. I also bought a M-audio fast track pro as a audio interface to record my voice and my bass guitar and was hoping I could record some demos along with intruments from the sound pool or the 2000 sound package. Ofcourse I tested it by doing a short 30 sec jam with my bass guitar and also put a little voice track on it. After making a entrire song with the magix sound pools I wanted to add my voice over the music and all went well for a little while. After listenening to it a few times I dediced I wanted to re-record some parts and thats when I started having the problems. It wouldn't record anymore! I set it up the exaxct same way I did with the previous recording but it wouldn't work! I have windows XP Professional on a Dell computer and I checked all the specs before I made the purchase of magix or the fast track pro. I first was sucessful recording with waive driver, fast track pro and after it quit recording I started trying them all from SB Live! 24 bit, soundmax, and asio drivers but nothing is working no more. When I click on record the recording starts but no monitoring sound and the track I'm trying to record on will go about 3 inches and stop. Also I get errors that say Cannot close waveform device for recording. The specified device handle is invalid OR Cannot DLL wavelnPrepareHeader Device #0. Dont know what any of that means or where to possibly look to fix it.