[sdiy] Cry Baby, was: Unique sounding modules that can't have voltage control?

[Mattias Rickardsson]

 <rburnett at richieburnett.co.uk> skrev:

> ...
> It's also interesting how the Q factor is larger at the low frequency
> end of the range, and lower when the resonant frequency is at the high
> end.  This is a bit unusual.
>

Still, there are some EQ designs with similar variations. Not to mention
those with different Q for different peak/notch heights.

We usually try to make synth filters behave "better" than that, but odd
behavior can be useful. I once had to design a 2-pole bandpass VCF with
only one VCA available. Having only one of the two filter poles
voltage-controllable gave a VCF that increased or decreased its Q as the
cutoff was changed (depending on which pole was the voltage-controlled
one). Since the audio material was already quite skewed in its spectrum,
one of these two skewed filter behaviours gave a more consistent output
level than a normal filter would.

/mr

>
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