Here's one (heinous) workaround for the OSX sound drop-out issue in MC/Rev. Capture the level of the beep volume, set the beep volume to a very low number, play a beep, and the restore the beep volume. I'm guessing this works because it forces the OS play a "required" sound. In my tests, setting the beep volume to 0 did not solve the problem (it must be at least 10), nor did setting the system volume level. So far, the only fix I've found is via the following method (there may be others):

(This can be called by a resumeStack handler and/or intermittently when the stack is idle)

on fixAudio
  put the beepLoudness into tLevel
  set the beepLoudness to 10
  beep
  set the beepLoudness to tLevel
end fixAudio

Disclaimer: I only claimed this can work; I did not claim it was pretty. Posted 6/19/2002 by Scott Rossi to the Use-Revolution List (See the complete post/thread)