m-audio fast track pro sound card doesn't support sleep mode on my MacBook Pro... You will end up with no sound every resume, forced to restart. Shame to Avid.
The good new is than I find a small workaround.
In a Terminal write those two lines (you will have to write your password):
$sudo kextunload kext /System/Library/Extensions/M-AudioFastTrackPro.kext
$sudo kextload /System/Library/Extensions/M-AudioFastTrackPro.kext
Now the sound should be back!
If you don't want to run those command all the time you can install sleepwatcher http://hints.macworld.com/article.php?story=20101130192909425 and make a script than run on each resume.