I run a Windows 7 (64 bit) PC with an Avid Fast Track Pro audio interface (also Pro Tools MP9). With Sibelius 7 it recommends using ASIO drivers, but when I try, I get a messgae saying that "The ASIO sample rate is not supported by one of the USB interfaces! Please check your sync settings in the Control Panel". I get the same message when using PowerTracks Pro Audio. I have set the audio playback to Fast Track Pro as default at 44.1 khz 16-bit CD quality. I know that Fast Track Pro has ASIO otherwise I wouldn't have bought it!! I read in another forum that it could be the Windows overwriting the sample rate to one not supported, yet I can't find any problems on my settings or ideas on how to overcome the problem. Any ideas, guys?