Sandra-4 is an easy to use dynamics processor specially aimed at setting vocal tracks levels. Just set the "T" fader to the desired level and Sandra-4 will try VERY HARD to keep your tracks around that level. If, as a result of Sandra-4´s job, you start getting too much breath/background noise, just use the included noise gate to keep it under control.
As a visual aid, Sandra-4 includes a handy waveform viewer. There you can quickly compare the original audio waveform versus the processed one.
And of course, if you think the processed audio sound too.... "processed", you can use the "FX" and "Dry" knobs to get the perfect balance for your tracks.
By the way, Sandra-4 also works wonderfully with bass tracks.