2 VCO's - 1 Log convertor (polysynth design)

[Paul Maddox]

Dear all,

  OK, crazy idea... Im trying to build my polysynth, it has 2 VCO's per 
voice, but what Im wondering is , does anyone know a way of driving 2 VCO's 
(usual ramp/square) from one log convertor, essentially they will play the 
same note, but one may be detuned from the other... I had though of messing 
with the reset level on the ramp generator, but this will affect the level 
of the 2nd VCO.

  If I cant it would mean Id need 16 Log convertors, which I really dont 
feel like trying to setup/tune..

  another idea I had, was to use 2 log convertors (one for each VCO) but 
multiplex the output of them into 2 8channel mux's.. This would involve 
sample and holds... but I fear that as the VCO needs a current input, NOT a 
voltage this would be a real pain to do... any suggestions? I should I buy a 
heap of Linear VCO's and use the mux idea? Id rather not, but....

  Any suggestions?

  Paul Maddox



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