It doesn't take much head movement to make the volume bounce
around. I record and edit my audio with SoundForge (producing WAV
files). Then I use GoldWave to batch process the files (Noise
Reduction: Clipboard noise print, Equalizer: Reduce mid [for my
voice], and Maximize Volume; Full dynamic range, in that order.
(GoldWave is inexpensiv and its batch processor great.)
The extra processing is well worth it, I think, unless your
projects are absolutely quick-and-dirty.