Hello
In June I will participate to a concert in which we all have to use Max/MSP. Therefore I am currently porting some of my Pd patches to MSP, and I have some problems with bandpass filtering.
In Pd, I use [vcf~]. I don't find any MSP filter that has a similar sound. With MSP filters like [svf~], [filtergraph] or [reson~], if you raise Q, you can still hear lots of frequencies that are only more or less attenuated. With [vcf~] some frequencies can disappear if you raise Q (actually, they are very much attenuated so you don't hear them). I prefer this sound.
The right solution sould be to use [biquad~]. MSP-[biquad~] looks like Pd- [biquad~] with some arguments inversed. Unfortunately, besides a paper from Harmony Central I didn't find much information on it. Do you know any documentation about biquad filters ?
How do you make the simplest (linear) bandpass filter using [biquad~] (parameters should be F and Q) ? I don't find any working conversion algorithm from (F,Q) to (bb1, bb2, ff1, ff2, ff3). I need something that resembles a '^' rather than a -90°rotated-'{', for any (Q,F) parameters :)
Thanks a lot
j