I started using PPro CS3 the other day and noticed a weird problem with audio. I finished editing a radio show, adding eq, reverb, and a few other tweaks. I then nested that timeline into a new one and played it back. The audio level dropped significantly and it sounded distorted - almost like the original input signal was amplified to distortion, then the output level was brought down. I didn't apply a audio fx to the new timeline. What could be going on here?