I would do the following;
1. Check the sound file in your aces high folder and listen to the sounds you're missing. It could be deleted or corrupted.
2. Make sure the volume of those sounds hasn't mistakenly been turned down. Go into Aces High, go to options, go to game sounds, and if necessary go to advanced (to make sure the individual sounds haven't been lowered).
Let us know how that works out.