Type in the % I want for an audio level. Currently I have to drag the little audio button up or down on the time line and it is very difficult to get to a precise number.
Actually the visuals may be better than a precise number. What you see in the audio amplitude is a running average which means you don't see the minima nor maxima values - ever. I don't think I've ever stretched the time line long enough to have 1 second of audio represented by 1 second of time line, but I have done that in "Cool Edit Pro". There are other programs, like EAC, and LAME that can make sure you never over-modulate. (which can turn superb audio into a static mess very quickly)