Yamaha CS80

Hi Juergen
I answered to the question by myself: the VCOs receive a "KV" voltage ; the "K" voltage, from KAS, is assigned to VCOs  and VCFs so , given that the same CV is shared by Assigner, Porta-Gliss, Ribbon and Sustain, this behaviour occurs in each of these situations: that means that the VCF are costantly driven and therefore there's a continuous tracking of the filters according to the pitch; this differs also from the "V" voltage which is responsible for the Keyboard Control (tracking ) and velocity signal; this occurs onto CS50 too, the design is basically the same.
Thx anyway.
M
  ----- Original Message ----- 
  From: dark_november2000 
  To: yamahacs80@yahoogroups.com 
  Sent: Tuesday, January 02, 2007 4:58 PM
  Subject: [yamahacs80] Re: Given that Crow and Kent....


  Don't know if this answers your question:

  On my CS50, the filters track the keyboard, but they don't track the
  octave switching. That's because the keyboard tracking is done with a
  control voltage, while the octave switching is directly done in the
  oscillators, where a number of FETs select different resistors.

  So the presets only sound "right" in the "Normal" transposition
  setting. I normally play in the -1 Octave setting, and actually
  changed some of the presets on my CS50, changing some resistor values.
  But that was _before_ I recognized that it's all just a matter of
  octave switching.

  JH.

  --- In yamahacs80@yahoogroups.com, "Max Fazio" <faxiomas@...> wrote:
  >
  > ....are really too busy because of their service job so they have no
  time to reply to anyone, could anybody give any answer to me about the
  pitch tracking on the filters? SInce I see no CVs or followers but I
  plainly hear a continuous tracking which is tied to the pitch ( simply
  switch octaves up-down and you'll realise it ) , can anybody explain
  me how this happens?
  > I talked some days ago with synth expert Rob Lebar from Alpha-Entek
  service repair in London UK and he explained me that
  > 
  > «This behaviour will occur on many analogue synths, with a resonant 
  > filter setting. If the filter is not controlled by the bend, or is 
  > controlled less than the VCO pitch.
  > 
  > As the pitch changes down, below the resonance it will be attenuated, 
  > relative to the level when going through the peak.
  > 
  > It will happen, more distinctly, if a fixed high pass (or band pass) 
  > filter is in use, the pitch will go below the pass band of the filter 
  > and be attenuated or cut off.
  > 
  > So it is probably the action of the filters rather than the expression 
  > circuit. »
  > 
  > As I told in the past, Juergen is right when he tells that the
  Expression circuit is not responsible for this behaviour, anyway if
  you play with any sound or select a preset like Organ1 (which has
  neither involving of velocity nor aftertouch) you can notice this
  effect, more if you raise the resonance to high levels.
  > If nobody has an answer, can you give me advices on how to contact
  an expert in order to understand this thing??
  > M
  > 
  > [Non-text portions of this message have been removed]
  >



   

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