freq. mult.

[WeAreAs1 at aol.com]

In a message dated 11/28/00 7:25:27 AM, blacet at monitor.net writes:

<< The standard method of using a PLL such as a 4046 and a binary counter
works well if you get the filter right. See "The CMOS Cookbook" by Don
Lancaster. >>

This has got me thinking...  Do you guys remember the old EML "Poly Box"?  It 
had a little one-octave keyboard and an input for a monophonic VCO, and it 
would allow you to play polyphonic chords that you could then send to your 
monophonic synth's VCF and VCA.  Obviously, it had some kind of top-octave 
divider in it.  But what I would like to know is:  Did it require the input 
of a very high frequency VCO (in order to put the top-octave divider's output 
in a useful octave range), or did it have some kind of frequency multiplier 
(PLL?) inside that allowed you to keep your monosynth VCO in a more "normal" 
octave range?  Have any of you guys ever owned or looked inside one of those 
Poly Boxes?

Michael Bacich