Honestly never really used regular computer synths much, but started doing some daily eartraining with Syntorial and got to trying to remake some of the synth sounds in PD. Two questions:

How are low-pass filters constructed in a standard computer synth? They have a 0-1 value in Syntorial (and presumably other synths). To reproduce that in PD I'm multiplying 0-1 by 30 (arbitrary value so that the sound stays pretty bright when the lop value is at 1) by the frequency of the pitch being filtered and putting it into a chain of [lop~]...

Syntorial's sawtooth and pulse(square) sound pretty clean, but in PD they have a lot of frequencies below the ground tone that make the sound very noisy. Are these filtered out with [hip~]s?

Also, anyone know any nice PD patches that regulate a standard synth setup? Might be interesting to analyze them.

edit: just noticed the thread two lines below this one, so I'll check that out...

@s.elliot.perez Never noticed by forum users, the pdpatchrepo site has other pages.....
There are a couple of synth patches to be found there.
http://www.pdpatchrepo.info/patches/patch/153 .....
Maybe a slightly newer version of miniwoog here...... https://app.box.com/s/kwtd5cagw5orw26d6vk3

And a sub/add/fm/am synth too...... http://www.pdpatchrepo.info/patches/patch/154
David.

@s.elliot.perez "They have a 0-1 value in Syntorial (and presumably other synths)."

"presumably other synths" not necessarily.

Standard lowpass filter parameters are cutoff frequency (in Hz) and Q.

hjh

@ddw_music I was wondering about this specifically since I figured the cutoff frequency would be relative to the pitch being played (whence the 0-1) and you don't want to have to be changing the cutoff while playing your melody, heh.

@whale-av Thanks! I'll check that page out.