Trying to increase the sound of recorded screen captures

Hi. I'm making screen capture movies with Snapz PRo 2 and they are being saved as QT movies on my desktop. When I open them in QT and try to increase the sound volume, the setting don't stick if I try to raise the volume over 0db. I read somewhere that QT won't let you save volume over 0db, is that true?
If so, does anyone know how I can increase the gain on the movies without having to load them into Final Cut or iMovie? Is there some program that will let me just edit the sound of a QT movie?
Thanks in advance.
Antonio

Hey, thanks for the tips. But... I don't think I'm making myself clear here.
I don't want to spend ANY time in post with these tutorial screencasts that I'm making. If I did, I'd just whip out my Sennheiser and my mixer and take the whole shebang into FCP and cut it and sweeten audio there.
What I'm doing is using Snapz to capture screen actions that I'm recording as tutorials for my students. I'm using either a Blue Snowball USB mic or my Logitech 250 USB headset with mic to record my voice as I demo apps on the Mac. Snapz is using the Apple animation codec to make the movies. But, what Snapz is not doing and cannot do is help me boost the audio a bit. If it did, then I'd have a finished movie right there. As it is, I have to wait a long time for Snapz to finalize the flick. What I don't want to do is load the film up in FCP (takes time) and then export it (also takes time) and be done. I want to package these things up fast. All I need to do is boost the audio a little and everything would be great. If Quicktime Pro allowed me to do that, that would be great because it would not have to re-encode the movie again.
Maybe there is no way to do what I'm asking without doing it in FCP. If that's the case then that's what I'll do.
THe whole point of this is that I want to keep it as simple and as past as possible because I am not making any money doing this (but I am teaching for money). I offer it to my students as a value added addition to their classes.
Thanks,
Antonio

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