Welcome to the forum.
For crashes, or hangs, this ARTICLE is a good place to start.
It begins with a checklist on getting PrE to run the best, then moves on to tuning up one's system and OS. Last, there are many links to troubleshooting.
Also, what format are your audio clips in?
For best results always use WAVs rather than MP3s -- and never use music directly from iTunes.