Hi Y'all-
Here's a link to something similar--
It looks like something which might be fun to build and use on its own,
though it really doesn't cover the whole harmonic series, just octaves
and fifths.
Someone with an electronics background might be better equipped to
comment on whether or not this could be modified to cover more/other
pitches or harmonics.
http://www.idg.se/personal/bergfors/bergfotron/vco.htm-head for the "octave quantizer" section
and a schematic at
http://www.idg.se/personal/bergfors/bergfotron/Oct%20quantizer.gifI might actually try this out of curiosity, eventually....!
Frank Vanaman
Baltimore, MD