Hey, moonchild, fellow dave here-
I just got my first macbook three months ago, I was a Sound Forge user on the PCs.
I freaking love Sound Studio 4.1.1.
I downloaded the trial version, processed one show with it, and went right back and paid for my full version immediately without using up my other 23 trials.
I just got home from taping four days of Wakarusa, and I got 18 sets tracked and processed lickety-split.
I can suggest a couple of things to try.
Simplest might be to simply highlight the low amplitude talking interludes, and under the filter menu use Amplify/Volume (^A).
I like how the scale reads out in both dB and percentage, so you are reminded that +6dB is +200% gain.
The undo is so quick and easy that you can experiment until you have it right.
I use compression on spots where a drunk thumped my mic stand or the stage had a uncontrolled sound spike.
I visually scan my tracks, and use the compressor to squash the spikes without being too harsh.
In this case i would typically use Threshold peak, -20 dB, 15:1 ratio, 0 attack, 0.2 s release, manual post-gain -1 dB.
I appreciate that you can do all the compression tweaking, and then set the post gain as high or low as you need to get it right.
One drawback to Sound Studio is that they don't have a bunch of canned compressor presets that many other programs do, so you have to understand what you are trying to do or experiment.
If you have Garage Band 11, the compressor presets in there might give you some ideas.
Good luck.