> Cool, i like filter design and this stuff, though i'm still at FIR-filters
> and haven't played with z-transforms yet.
> How does it sound? :)

With a fixed cutoff frequency... almost inaudable. But if you *sweep* 
the cutoff frequency, it sounds mostly like a phaser.

FIR filters are much easier to design, and can give a more exact 
frequency responce.

IIR filters are harder to design, and don't give quite such exact 
frequency characteristics... but they run *much* faster! (For example, 
the above filter requires 5 multiplies and 4 additions per sample to 
filter a signal. A 5-point FIR couldn't possibly produce such a narrow 
reject band.)

Anyway, I learned everything I know here:
http://www.dspguide.com/

Enjoy. ;-)

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