filter waveform question

[Ingo Debus]

Toni Jovanovski wrote:
> Filter design.There is a lot of analogue filters , like Butterworth ,
> Chebyshev I & II ... But in a synth design with simple waveforms ( saw ,
> pulse , triangle ) it's a question of luxury.

On a second-order filter (12dB/oct) it is the Q parameter that
determines whether the filter is a Butterworth or Chebysheff or
whatever.

> I think , in synth-design , that fourth-order VCF ( four poles in same
> place ) is fairly enough.

But the poles move when Q is changed, don't they?

Ingo