I have both the VolumeMeter and WaveformPainter being utilized. I'm also using a BufferedWaveProvider to feed audio over the network. I'm also using WaveIn for capturing microphone audio along with showing its samples in a WaveformPainter also so you can see your TX modulation...anyway to give you a better idea of what i'm doing here is a youtube video, the client in the video is actually outdated and it looks a lot different but you can see the waveform and volume meters in action @ about 15 seconds...
http://www.youtube.com/watch?v=T1GMfsIAlIU
NO, i'm not trying to detect voice with the volume meter.