> > For getting the pitch itself, you use a pair of oscillators, like
> > 700kHz-ish.  They sit maybe 200 Hz apart at idle more or less. So
the
> > mix products would be 700200, and 200 hz.
> 
> Uhh, shouldn't that be 1400200Hz, and 200Hz?
> Sum and difference. 200Hz apart means 700khz and 700.2kHz as f1 & f2.

Sorry, yes.  Makes no difference in real life, the ckt is only
interested in the low product.

> You could even cheat and have the PIC 'fix' your bad pitch just
> as modern DSPs do for today's not so good singers.

This is a little bit interesting, but you also want the slow glissando
and vibrato, and I'm not sure how you could handle that, without some
sort of "fix me" input to tell it when to let the natural pitch through.



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