I used an M-audio 2496 music card with a small Mackie mixer for many years. I have always used Acid Music Studio, I have 8 and 9. I had some problems with 9 so I went back to 8. I recently switched to a Focusrite Scarlett and have had a lot of problems. I can only record in 24 bit, 16 bit is noisy and unusable. So I have had to use AMS 9 exclusively. I've gotten lots of lockups with AMS and a few blue screens of death. I am running Win 7 64 bit, Core2 Quad with 6 gb ram. Any help appreciated.