Yamaha CS80

Laurie

No, it's my usual doubt with the EXP pedal...
Anyway I should have understood something, let'see if I got it....

-Among the exp circuit the Vactrol tube has a big importance , not just because it is driven by the pedal but because it seemingly has a relationship with the general volume or the fundamental frequency of the VCOs
-This relationship can justify why with lower notes the sound seems more "filtered" : the Vactrol 
has a less emission of light when the volume is low, therefore being the low notes perceived at a lower volume than high notes , the filter network would be driven by the Vactrol even with no pedal CV going on, to get that kind of Loudness compensation. 
-So the filter network in the exp circuit are definitely NOT fixed and they track the keyboard , although with regards to the volume...

Hope I was right...
PS: sorry Juergen , you were right but I had to realize these things myself.....
M
  ----- Original Message ----- 
  From: laurie 
  To: yamahacs80@yahoogroups.com 
  Sent: Saturday, September 02, 2006 5:06 AM
  Subject: Re: [yamahacs80] Please, anybody HELP!!!


  Im not sure what you are asking Max ...are you talking about the
  "Wah"pedal circuit???

  Max Fazio wrote:

  > Hi guys....how can it be possible that nobody here can speculate
  > anything about this expression circuit??
  >
  > OK, there is this famous 3rd filter into the EXP circuit, it's made of
  > a couple of 3dB lopass filters forming a 1pole lowpass for a gentle
  > filtering; I don't know why the low notes sound filtered and the high
  > notes have not this impression, why if you slide down with the ribbon
  > you plainly get an effect of tracking even if you aren't applying any
  > key tracking, why if you put in some resonance into the master
  > fitlers, this effect retains part of this resonance.....
  > Guys, anybody can give me a little hand or address me wherever I can
  > get these infos??
  > Please help!!!
  > Max
  >
  > [Non-text portions of this message have been removed]
  >
  > 

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