Yamaha CS80

Laurie
Well, the waveform generator has 8*2 of them into the cs80 so it 
is likely that there is one waveform generator per note...I believe 
that this behaviour takes advantage of:

1. the keyboard mechanics ( 
close relates to the CP-30 electric piano ) which feature long legs 
making it even more sensible , even if I don't remember where the 
velocity sensors are

2. the exponential CV of the aftertouch which 
allows dramatic changes with low aftertouch force on the fingers

Therefore it happens that you are playing an aftertouch only keyboard 
really, a very good one for the truth and the velocity acts there along 
with the aftertouch: low velocity= low aftertouch, meaning low level 
sampling and then no initial transient,high velocity=high aftertouch, 
where the circuit samples the level you reach at the maximum speed , 
then , according to the velocity sensitivity, it lowers the amplitude 
of the cv to the level set with the "initial" sliders, therefore , 
through this "muting" you get both the initial transient and the 
velocity level...it's like a fusion of velocity and aftertouch 
together!

BTW, I'll follow your advice abotu the girl, even if I can 
always activate  the wah-wah but without the chorus active, otherwise I 
could wake up the neighborhood!!!
M

----Messaggio originale----
Da: 
laurie@...
Data: 19-mag-2006 3.49 PM
A: <yamahacs80@yahoogroups.
com>
Ogg: Re: [yamahacs80] CS80 touch reponse: mistery solved!!!

When 
you say this ,it makes sence to sample/hold the top most pressure
with 
one key......I find you can apply more pressure on a single key
than on 
a key within a chord as your strength gets more evenly
distributed 
across the hand with a  chord....If the hold time didnt
exist, playing 
a loud melody and then adding notes in the same hand
would cause a drop 
in effect of the AT you are trying to maintain on
that note....Pretty 
clever  but...
 Is it possible to hit that "hard" velocity without 
causing some AT
happening......I thought when I pounded down to cause a 
high velocity
occurrence my inertia would add aftertouch briefly to the 
note causing
an extra amplification around the attack time....would 
this slight hold
of my initial AT be in play as the decay portion 
commences??? thus
causing the bump or is this circuit actually 
modifying the attack time
which is set with the envelope?????

BTW if 
you try to use too much single fingering on the G.F while in
irresponsive mode.......you end up with a lot of time for intimate full
hand clusters.....:o

Max Fazio wrote:

>  Yeah, Laurie, a kind of!
> 
You were right about your statement, actually, the implementations of
> 
the
> touch response which came after the patents I mentioned ( mostly 
uspns
>
> 4018125 , 3816636 and 3626075 ) , reported a touch response 
as a
> derivative
> function of the aftertouch , with FETs and OTAs 
combined to "sample"
> the
> higest AT value you play on an estimated 
basis then keeping it and
> lowering
> it to the velocity level value 
you set then havng the double advantage
> of a
> sharp attack at high 
levels ( then also the "bump" when the waveform
> starts
> to output ) 
which focuses also on the filters giving the piano or
> pluck
> 
effect....
>
> PS: My ex girlfriend loved aftertouch and varied pitch 
by sliding a
> finger
> or two on her, you could start from 0Hz to high 
pitch.....happily she
> didn't
> love velocity at all..... ;-)
>
> M
> 
----- Original Message -----
> From: "laurie" <laurie@...>
> 
To: <yamahacs80@yahoogroups.com>
> Sent: Friday, May 19, 2006 1:41 AM
> 
Subject: Re: [yamahacs80] CS80 touch reponse: mistery solved!!!
>
>
> > 
Do you think this is there so you could overwrite a slow attack with
>
> > aftertouch prior to the decay sequence and is this vector based as
> in
> > +Change of CV is touch responsive and -Change of CV is touch
> 
> irresponsive.......
> >
> > BTW....My girlfriend is exactly like 
this....When I touch her, her
> > response is to peak at a high 
amplitude before I get cutoff and then
> she
> > is in touch 
irrisponsive mode...with sharp punchy
> control....releasing
> > me to 
hang with the transients.... thats why I still hang on to the
> ol
> > 
eighty.....lol
> >
> > Max Fazio wrote:
> >
> > >  Hi guys
> > > Just 
to share with you this fantastic discovery: I had a new look
> > > 
among the patents related to the GX1 and CS synthesizers and found
>
> 
> > u.s.pn 3636232 and u.s.pn 3784718 relating to the touch response
> 
cv
> > > circuit : the circuit acts as a double signal which encodes 
two
> types
> > > of signals going into the same output:
> > >
> > > 1. 
a so-called "touch responsive" signal which provides a cv on a
> > > 
level which could be both on amplitude and cutoff: the level isn't
>
> 
> > just flat but has a decay of 1.5 seconds and a peak slightly
> 
higher
> > > than the actual sustain level which becomes hearable when 
the
> level of
> > > the touch responsive signal surpasses the sustain-
cutoff level.
> > >
> > > 2. a so-called "touch irresponsive" signal 
which provides a sharp
> AR
> > > envelope waveform which has a peak 
which is independent from the
> > > velocity and relates to the first , 
attack transient, providing a
> > > sharp , punchy amplitude cv to the 
controlled signal. Even though
> this
> > > AR envelope is able o raise 
its amplitude peak along with
> velocity
> > >
> > > The combination of 
the two produces a combined cv that acts to
> give
> > > the long 
sought after "natural" touch response: the AR of the t.i.
>
> > > 
signal stays quiet under the touch responsive signal under
> acertain
> 
> > velocity value, then , with high velocities it can raise up to a
> 
level
> > > higher than the touch responsive signal then decaying down 
to the
> > > touch responsive signal ( for itself the t.i. signal 
decays to 0
> but
> > > the combination of the two allows a kind of ADS
(R) as the
> velocity's
> > > CV
> > >
> > > This solves the mistery 
about my long debated "plucked" response
> on
> > > certain presets.
> 
> > What do youthink of this discovery? could it be recreated as an
> > 
> encoder into a whatever keyboard??
> > > M
> > >
> > > [Non-text 
portions of this message have been removed]
> > >
> > >
> 
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