i'm looking for a set of good sounding but cpu wise resonat lo-, hi- and bandpass filters with a signal inlet for cutoff frequency. could someone give me a hint, wich would be the best to use? since there's a whole lot of filter objects, i don't know where to begin.
and just another question: is it correct, that i have to use filters and amp envelope for each voice in a synth?
thanks in advance.

@toxonic said:

is it correct, that i have to use filters and amp envelope for each voice in a synth?

Well, you don't have to, but if your aim is creating a "true" polyphonic synth then the answer is yes. Each voice has it's own envelopes and filters. I'm also working on my main synth (12 voices max) and there's only 1 resonant filter, because I'm afraid 12 vcf's would not be friendly for my cpu But then I find it's ok to have the filter after the actual voices. It would be certainly nice to have each voice have it's own filter but I can live with the limitation.

thanks domien! well, i guessed it...

nevertheless, still i have to ask for hints for nice filter objects with signal controlles cut frequency (bandpass, lowpass, highpass) . vcf~ is a bandpass, afaik. btw, could sobody tell me, what the second outlet is for? another filter quality?

The second outlet is the imaginary part of the signal. You could use [svf~]. There are actually two versions in Pd: one from bsaylor and one from cyclone. I don't really use them, but looking at the help files, the cyclone one looks like a better choice to me.

I wrote an audio rate version of [biquad~] not that long ago and an abstraction to calculate coefficients for various filters with audio rate control. It's not the most cpu friendly implementation, but I can post it later if you like.

thanks!
would be great, if you could post that stuff!

http://puredata.hurleur.com/sujet-5342-signal-controlled-filters