[sdiy] SSM2164 base for Doepfer sdiy synth kit.

[David G. Dixon]

> > Now how do I work a 2164 into an LFO?
> 
> Neil Johnson's got an example on his site:
> 
> 	http://www.milton.arachsys.com/nj71/index.php?menu=2&submenu=0&subsu
> bmenu=2
> 
> Actually, it's two examples really. See the schematic for details.

OK!  I wasn't thinking of a VC LFO, but what the heck? 

> I think that covers it. We've got SSM2164-based VCOs, VCFs, VCAs,
> envelopes, and LFOs. I'm sure we could do voltage-controlled lag or
> portamento too. Anything else unmissable I've forgotten?

Yes.  The "2164 Multiplying Modulator", my fancy variable-quadrant ring
modulator -- although, whether it is "unmissable" is debatable.

And, of course, a stereo mixer/panner (something the chip was actually
intended to be used for by its inventors).

We should have a little contest to come up with as many 2164-based module
ideas as we can, and then I can write about them.

One thing I'd definitely like to write about is how to convert filter
designs based on other circuit elements to 2164-based filters -- that's a
favorite topic of mine at the moment, and very useful to know.