If I understand the question right, all you do is swipe a section of your audio to hightlight it and then grab some point in between and drag it up or down. Four points will appear.
If you have two mikes working at the same time during a shoot, you can hightlight both tracks then slide one up and the other one down. I do that for interviews when one person talks and then the other.
Roger Bansemer – PaintingAndTravel.com