[sdiy] Roland System 100 - Circuit details.

[TooManySynths]

First, the schematics are here:

http://home.camelot.de/fa/diy/

> Well, fwiw, there are really only 3 basic things
> that make up the sound of
> an osc:
> 
> 1) linearity of response of the freq/cv

In what way does this manifest itself in the sound?  I
would hazard that less than perfectly linear response
would cause the osc to be out of tune, so to speak,
which would translate to a "phat" sound.  Or,
something other than a sterile sound.

> 2) waveshaper

Yes, this I'm aware of.

> 3) stability

So motion in the detuning?  I suppose by this that
perfect stability is probably good for some things but
not necessarily a "good" sound.  The matrix 6, for
example, is quite stable, and hence somewhat
uninteresting.  I don't perceive the 102s to be
particularly stable, and, I have read here that, in
part, UA726 designs are inherently flawed in the
stability department. Perhaps this is why it sounds
good?

> So, you need to figure out what makes this osc
> particularly different.. In
> the case of say a 303, its the timing pulse being
> fed into a integrator, and
> then into a wierd discrete saw to sqr waveshaper
> which has a very sloppy
> response and basically turns into a sine wave as
> freq increases. 

Is this the main reason for the hollow sound of the
303 square wave?  If so, I think I would like to put
that circuit in my FR-777, at the very least I will
experiment.

> If you have a schematic, it would be fairly easy to
> pick out..

See above, I would appreciate it if you might take a
look.

Thanks
Daryl



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