MOTM

On Sun, 10 Mar 2002, edibennardo wrote:

> A question for the list and maybe for the old crow... Any thoughts about
> how to emulate a true CS80 using our MOTM modules?  Filter 480 will be a
> must of course but, what else? I don't have in mind a full 8 voice (16
> vcos) but the possibility of two or three voices at least would be
> necessary, I'm talking of CS80 but what I really have in mind is the
> incredible expressiveness of the Yamaha GX1 that is so strictly related
> to CS80... yet does anybody have enough information about the third
> monophonic keyboard on top of the GX1? I heard it has peculiar features
> not related to any other existing Yamaha synth. Sorry for the slight OT
> Enrico Italy

  I patched up a CS voice in MOTM modules while working on the '480
prototype.  Note: it is not an exact voice setup, in that the actual CS
filter EG is bipolar and I used an '800 biased down through the '830.  I
am making a CS filter EG for my own use--more on that when my prototype is
working.  It uses a PIC (naturally).

  My single CS voice patch used: one '110, one '300, one '480 prototype, 
two '800s, one ,820, one '830.  Both 'halves' of the '830 are used: one to 
mix the '300 sine and '480 HP->LP out, one to bias the output of an '800 
down a few volts to fudge a bipolar ADSR (lacking the initial 
level/attack level controls of a CS filter EG, but allright for general 
CS enveloping).  The '820 I used to lag the filter frequency CV behind the 
VCO pitch CV a little to obtain a bit more CS-like brass attack.  I'll 
draw the patch sketch later.

  Gordon Reid describes the solo manual in his GX1 articles in a couple of
Sound on Sound magazine issues.  There is a link from www.cs80.com to 
them.

Crow
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