I am working with some video originally recorded in 1972. The footage is now on Digi-beta, and the audio sounds pretty horrible. It is over modulated and its peaks are floating around -12db. Of course when I boost the levels it really sounds bad. When I don't boost the levels, it sounds okay, but the problem is that it is still quiet. I am pretty sure I know the answer, but if I am boosting the levels, am I adding any additional noise or causing it to overmodulate anymore then it already is? I think that it was transfered overmodulted at some point and now I am working with some evil stuff.
any insight is appreciated.
As long as you don't clip the signal you won't add more distorsion. As you raise the overall level of the signal you'll also raise the level of any noise that's in the program. You can use Soundtrack Pro or SoundSoap (there are other noise reduction programs, too) to remove certain noise like hum, rumble and broadband hiss. However, you are stuck with any distortion that's in the signal. You can try rolling off the high end a little bit to de-emphasize the distortion, but that will also affect the "brightness" of the program.