Yamaha CS80

Juergen? Still no time?
Thx for your reply.
Max
By the way: I looked back into some lists including the AH board but found
nothing about the Chorus : does the ON/OFF switch arm the chorus without the
LFOs modulation?
M
----- Original Message -----
From: "Max Fazio" <faxiomas@...>
To: <yamahacs80@yahoogroups.com>
Sent: Sunday, January 22, 2006 1:16 AM
Subject: [yamahacs80] Speed Modulation


> Hi all
> This is especially for Juergen.
> I've been happy to read a nice discovery you made about the differences
between amount and speed modulation in the CS80, I refer to your message on
the Analogue Heaven board of October 16th, 2003;
> Quoting
> > You never stop learning - last night I read a CS-80 review at
> > www.amazona.de , and suddenly learned that the smaller CS-synths
> > are missing another fine detail of the CS-80: Sub Osc (LFO) speed
> > modulation via aftertouch!
> >
> > Surprised that I never had noticed this before, a question
> > was immediatly arising: The CS-80 has polyphonic aftertouch, but
> > there is only one Sub Oscillator. So the CS-80 must also emulate
> > monophonic aftertouch internally. I consulted the schematics, and
> > found that there is in fact a set of diodes which creates the
> > *maximum* of all individual pressure sensors, and uses this to
> > control the LFO speed. As expected.
> >
> > But there's more, and this is where it may become interesting:
> > The diodes cause a voltage drop of approx. 0.5V, and there is
> > no compensation circuit for this. So I expect the LFO speed
> > modulation to come *later* (at a higher threshold) than VCF / VCA
> > modulation when you gradually increase the pressure on a key.
> > This would allow some brilliance and volume modulation by
> > aftertouch without LFO speed modulation at low pressure
> > values, and LFO speed modulation joining in at higher pressure
> > values. Which would be another very sensible choice for a great
> > performance-type instrument.
> >
> > Can anybody confirm (or correct) this behavior?
> >
> > Now I know another mod I have to do for my CS-50 (;->)
> >
> > JH.
>
>
> End of quote.
> So what do you mean when you talk about the maximum number of pressure
sensors involved with the Speed trigger of S-O? and what about the % of
pressure that allows the trigger of the speed?
> Thx fr your reply
> M
>
> [Non-text portions of this message have been removed]
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