[sdiy] SSM2164 expo VCO finished

[David G. Dixon]

To all who asked me for the files related to the 2164-based VCO (and there
are about 10 of you so far):

I have a couple of minor issues I want to work out before I send it.  I'm
picking up a stray voltage at the current-sourcing VCA's VC pin even when
the CV is grounded, which is making the 0V frequency significantly less than
the 500 Hz I designed for.  I want to make sure this isn't because of some
mistake I've made.  Also, I want to reconsider one of the trimmers which
doesn't seem to be having any effect, and also consider adding a trimmer for
the reference frequency (it might be nice to be able to adjust this to, say,
440 Hz, and then have a CV-grounding push-button on the panel which produces
this tone for tuning purposes).  I'm busy with Canadian Thanksgiving for the
next couple of days, but I'll try to get everything out by Tuesday evening,
Wednesday at the latest.