Another way to add more control if the volume goes all over the map is to drop in a volume envelope. From Tool Bar Insert/audio envelope/volume. That will add a thin blue line across your audio track.

As you move your cursor over the line it will change to a hand cursor. While holding down your left mouse button move the blue line up or down and note the readout.

Now right click on the blue line just before where you want to effect the volume. Select add point and a little blue square will get added to the line. Add another right next to it. The first will serve as a marker at the current volume, the second you can drag up or down to lower/raise the volume. Add as many additional points as you need. The squares can be dragged to more preciously locate them. To make it easier click on the maximize track height button at the extreme left of the track, just left of and under the track number.

In addition to the compressor, you can right click on the audio track, under switches, select normalize. For best effect you should isolate the area by splitting the timelines into events, applying normalize only where needed. Also, try clicking on the green track FX button (start of track) and adjust the track equalization. Its covered in more detail in the manual. Should be in online help too.