[sdiy] VCO Linear Voltage

[Jerry Gray-Eskue]

OK I am starting to see how it can be useful, if you want to control the
Modulation at a fixed frequency range as in the case of the beating you
would use the Linear input. Are there other uses beside beating? Is this
perhaps a useful input for "Robo Voice" effects?

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl]On Behalf Of John Mahoney
Sent: Tuesday, November 17, 2009 9:00 AM
To: Synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] VCO Linear Voltage



>How is the linear voltage control of frequency useful on a 1 volt per
octave
>VCO?
>...
>What am I missing here? Is this useful for modeling the timber of some
>certain instruments or perhaps other acoustical artifact?
>- Jerry

Patching a VCO's sine output to a linear FM input yields interesting
timbral changes. It needs to AC-coupled, though, or the pitch goes
wild. At least, that's what they tell me. To be honest, I've tried it
and the pitch has varied even when it's AC-coupled -- but I did like
the timbral change.

You can also use linear FM to generate voltage-controlled beating,
which sounds different than tremolo from a VCA. (I believe that JH is
a fan of this.) Oh, sure, you can use expo FM to induce beating, but
the beat frequency is not as controllable as with linear FM.

John

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