[sdiy] Polymoog Resonator virtual ground

[David G Dixon]

> Link to schematics may provide insight.

D'Oh!  Go to the bottom of this page:

http://www.jhaible.com/resonator/resonator.html

The schematics are broken up into five sheets.  The power supply (with the
reference voltage follower) are on Sheet 1, and this voltage is used on the
other four sheets.

I think that Don is probably right -- they shifted the audio to put it
within the range of the CMOS switch, and this was the easiest/cheapest way
to do it.  (However, use a DG4XX switch and this problem disappears.)  I was
just wondering if it was for some magical Moogy reason that I didn't
understand, but probably not.  It wouldn't change the sound at all (except
perhaps to encourage excessive clipping against the top rail).