Yamaha CS80

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]

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]
>
>

[Non-text portions of this message have been removed]

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]
>
>

[Non-text portions of this message have been removed]





[Non-text portions of this message have been removed]