http://mark-dot-net.blogspot.com/2008/10/volume-metering-and-audio-waveform.html
http://mark-dot-net.blogspot.com/2009/07/audio-waveform-drawing-using-wpf.html
https://github.com/beschulz/wav2png
http://sox.sourceforge.net/sox.html to output to png
https://github.com/superjoe30/waveform