http://www.premiumbeat.com/blog/audio-keyframing-tips-in-avid-media-composer/

When editing audio in Avid Media Composer, you adjust the audio gain within segments in the Timeline by adding and adjusting keyframes—a process called rubber banding. This process is often a meticulous task, so it’s useful to be able to use as many streamlined techniques as possible, since accurate audio editing is such an essential part of the post production process.

To Remove Effects on a certain area, you can’t Mark In and Out, you have to enter Segment Mode and do it. Easiest way is to ALT + “lasso” (left to right) over the area you want to remove effects from which automatically puts you in Segment Mode and selects those clips), and hit the Remove effect button (note: this will only Remove the top most layer of effects, so if you have nested effects, you may well need to do this a number of times to be safe).

Now, to remove Dissolves is a little trickier.
Weirdly, you have to be in Effects Mode. Select a Transition, then “lasso” (left to right) over the area BUT MAKE SURE THAT YOU START LASSOING ABOVE THE TIMELINE, NOT ON IT. This selects all the transitions for tracks selected. And hit the Remove effect button.

You can copy it to the source window by marking it with in/out and hit alt + c. this creates a virtual subsequence that can be edited onto other tracks. Works with several tracks at once, also …

http://community.avid.com/forums/p/88217/500838.aspx

select track(s) with clips you want to change, mark in to out covering all the clips you want to change, park on a clip , change audio level as needed go to the fast menu in audio mixer and set level on track – in -out.

without an in to out the option it’s the same but global, or mark just in or out and it will change from or to that mark

http://community.avid.com/forums/p/90355/513393.aspx

http://www.steves-digicams.com/knowledge-center/how-tos/video-software/about-avid-media-composer-keyframe-audio.html