I know after effects isn't meant to play sound during the preview (which is bull imo), but it was working just fine for me yesterday. After a little bit of messing around with render settings, and restarting AAE (CS5.5 trial), it no longer plays sounds. I'll render the desired part, and when the green bar is full, I'll preview it. BUT THERE IS NO SOUND. Any ideas on how I can fix this?
I know after effects isn't meant to play sound during the preview
Where did you read that? You have it wrong. For all intents and purposes, that's the whole point of RAM previews. For the rest - check your time/ preview and audio monitoring panel if you haven't accidentally muted things. Also check your audio prefs.