In regards to David's request for some samples of my VCO, 1)
I'm flattered, thanks for asking and 2) here ya go:

A) Sine on Sine FM:

http://www.buzzclick-music.com/266_sample1.mp3

B) More FM:

http://www.buzzclick-music.com/vco2.mp3

C) Still more FM (kind of boring...):

VCO_test1.mpg

D) Sample of its transcient response to 'chiffs':

http://www.buzzclick-music.com/wowzuh.mp3

E) FM'd by its own squarewave output (sounds lame at first, but
gets interesting once the FM kicks in:

http://www.buzzclick-music.com/vco_fun.mp3

F) Saw out thru lowpass filter :

http://www.buzzclick-music.com/pitch_sample.mp3

G) The infamous PWM sample (it kicks in midway - this is one
VCO you're hearing):

http://www.buzzclick-music.com/PWM_sample.mp3

enjoy (or not),

Peter