Yamaha CS80

When i looked at the waveshaper chip on the CS80 M boards, it appears
to also have a pin for triangle wave..... I believe I have a blown up
picture of that chip circuitry in the photos section....

Has anyone tried adding the triangle option???


-----Original message-----
From: "David Rogoff" david@...
Date: Wed, 21 Nov 2007 15:15:46 -0700
To: yamahacs80@yahoogroups.com
Subject: [yamahacs80] CS80 vs. GX1 - Re: Total # of voices in a GX1?

--- In yamahacs80@yahoogroups.com, "neriks2003" wrote:
> > > Yes, it's true. I think that the polyphonic aftertouch 
> > > is one of the few drawbacks of the GX-1 compared to the 
> > > CS-80.
> > > 
> > Huh. I never realized that. Bummer! Do the two manuals have
velocity?
> No velocity

Wow. So the solo/mono keyboard is the only one with any touch
sensitivity.

> > Very cool! So to have the real-time programming of a CS80, 
> > I'd need to get six of these boxes, mount them in a giant 
> > frame and connect them in place of a tone card for each 
> > voice section!
> 
> You would in fact need seven tone-boards. One for each section and 
> row! ;-)
> 
> I'm planning to build at least two additional tone-boards to the
GX-1 that I'm working on.

Definitely send us pictures! I love how they mount the EG level
sliders vertically and the EG time sliders horizontally.

Following up on this, I looked at the voice-card parameters from the
tone board and compared it to the CS80. I put a picture here:

http://launch.ph.groups.yahoo.com/group/yamahacs80/photos/browse/e183

It looks like the GX1 adds a triangle wave and static filtered
versions of the square and sawtooth waves. There's also a polarity
switch on the VCF EG output. It looks like it's missing the sine wave
bypassing the VCFs (which I think is really useful). It also looks
like the touch response settings are missing, which make sense given
the previous info from Niklas. I'm also not sure if each voice has
it's own PWM oscillator.

How do people who have used both instruments think these differences
affect the sound? I also remember Crow's analysis and recreation of
the VCFs in both and that they sounded different from each other. How
close can a CS80 come to sounding like a GX1? What about stuff other
than the voice cards? Ring-mod? Sub Oscillators? Other controls?

David





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