Matching audio levels in disparate clips

Hi. I'm compiling a DVD that has clips from various sources. Some of them are old DVD projects that I've had to extract clips from, using MPEGStreamClip.
My problem is getting a uniform volume setting amongst all the clips: Some are low volume, and some are high (or optimal) volume.
Does DVDSP allow for the "regulation" of individual track volumes? This is vexing me to no end.
Thanks

I had to go back and re-encode to get my levels to match. It was a PITA, but I got it done.
This is a feature that Apple needs to put into DVDSP: the ability to change individual track levels or normalize (set all to the same peak level) all tracks.
When doing a compilation of clips, demo reels, etc., one is likely to encounter all variations of audio levels and amounts of audio-hardware-type compression.
Having to convert an ac3 to QT, or some other format and then re-compress it back to ac3 is going to irrevocably degrade the audio quality.
It'd also nice to be able to do audio and video fades withing DVDSP.

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