Yamaha CS80

Hi David
You should look at a previous step than the SH, which is KAS 
itself:  basically you should look at the processing of pitch CV as 
serial and monophonic; the polyphony is helped by the gates straight 
into the SH, while the KAS internally makes possible to distinguish 
between the busy and the avaliable voices; this lets you have polyphony 
and mono unison according to the avaliable notes while in S-2...
truncating notes...well it is a myth: you actually don't truncate 
anything but if you set long release for the envelope and at the same 
time you have *all* the gates in the SH open, you will definitely 
"hear" the monophonic allocation of the pitch, because the envelopes 
are still running...
Basic explaination but I guess it's what you need.
M

----Messaggio originale----
Da: david@...
Data: 7-feb-
2011 7.07 AM
A: <yamahacs80@yahoogroups.com>
Ogg: Re: [yamahacs80] 
Unique keyboard features

>
> 	
>
>
> I just put in a couple of 
comments there, including about the (as far 
> as I know) unique 
Sustain I/II modes. Does anyone know of any other 
> keyboards, besides 
the CS50/60/80 that have this ability to have a 
> long release time 
but have new notes cut off old ones? I think it's an 
> amazing feature 
of the CS80 and have never seen it anywhere else.
>
I realized a little 
bit ago that I didn't know how the CS80 did the 
Sustain I/II trick. 
So, I've been looking through the schematics - and 
I'm still 
confused!  I only see the Sus I/II switch going to the SH 
board.  This 
explains the Sus I/II behavior of glide continuing after 
letting go of 
keys in Sus I but freezing pitch in the middle of a glide 
in Sus II 
(or is it the other way around??).  However, it doesn't 
explain how 
notes get cut off.  I thought I was onto something, but it 
was just 
the mixing of the Sustain slider on the left-hand panel (PN3) 
with the 
programed VCA and VCF release voltage going to the M cards.  
This 
circuit is on the Sub board.  Where did I get lost (which is easy 
to 
do on the giant schematic)?  I don't see the Sus I/II switch 
connecting anywhere else.

By the way, I wish the CS80 didn't freeze 
the glide in Sus II mode.  I 
think I might temporarily disconnect that 
wire to hear how it sounds 
with glides finishing in that mode.

  
David


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