[RE: LFO voltage?]

[Harry Bissell]

Harry Bissell writes:

Watch out.... "string" players get vibrato by wiggling their fingers both
perpendicular to the string (positive only) and parallel to the string.
Parallel will give (on a non-fretted instrument, violin etc) true plus and
minus pitch variation. And in practice, even on a guitar wiggling your finger
this direction will "tighten" and "loosen" the string, causing the same
effect....

I'd say that for Triangle and Sine modulations, bipolar signals are correct
(+-volts) and that Sawtooth and Square waves should be unipolar positive.
There are few exceptions to this rule of thumb.

:-) Harry



"Jeremy Brookes" <jbrookes at bluebear.freeserve.co.uk> wrote:
> BUT... when using square wave I find that I like a
> unipolar positive only output on the vco and vcf. This means as you turn
> up the modulation, the pitch always goes up from your pressed note,
> trills are more natural this way.

This is very true. If you think how pitch modulation is applied to stringed
instruments in the real world, the pitch is only modulated up from its
non-modulated pitch. I'd imagine that a rectified sine wave as the modulator
would sound most "familiar" in terms of real-world pitch modulation. So
positive uni-polar modulation makes sense here. But then we don't always
want sense...


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   jezz at bluebear.freeserve.co.uk
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