Synthesizer PPG Wave e Waveterm

http://en.wikipedia.org/wiki/PPG_Wave
http://www.vintagesynth.com/misc/wave.php
http://www.youtube.com/watch?v=zu0EsapgHfA
http://www.youtube.com/watch?v=ULiqAACHl-U
http://www.retrosound.de/wave2.2.html
http://www.synthtopia.com/content/tag/ppg-wave
http://www.synthmuseum.com/ppg/ppgwave01.html