AW: Duophonic Keyboard

[Ullrich Peter]

	Hallo Gene!

	>As you point out, the CV's are not independent and there is no second trigger.  
	>This could be added by differentiating the change in the second control voltage.  
	>In other words, this has its limitations, but it's practically free.  
	>My name is on the patent.  I think it was about '71.

	Your name is on the patent? Interesting. 
	I built such a circuit in the 80s. I think it was called new pitch detector.
	It was built as you said with a differentiator and rectifier and schmitt trigger or pulse shaper.
	I don't have this circuit any longer so maybe you could give us a circuit!

	Ciao
	Peter

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                   Ing. Peter Ullrich         mailto:ullrich at kapsch.net
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                   Hardware & Software Developer /  Electronic Musician
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