Cockos JS resonant low pass

[mccrabney]

what does it mean when it says "low quality" in the js description? it doesn't really sound "low quality"

second, currently when learned, the cutoff increments in 100hz. how can i lower that value to something to prevent zippers?

third, when using this as a sweeping effect, would i be better off using something else?

thanks.

// This effect Copyright (C) 2004 and later Cockos Incorporated
// License: GPL - http://www.gnu.org/licenses/gpl.html

desc: Resonant Lowpass Filter
//tags: filter
//author: Cockos

slider1:1000<20,20000>Frequency (Hz)
slider2:0.8<0,1>Resonance

@slider
  cut_lp = slider1*2 / (srate); 
  //res_lp!=slider2 ? n3=n4=rn3=rn4=0;
  res_lp=slider2;
  fb_lp=res_lp+res_lp/(1-cut_lp);

@sample

n3=n3+cut_lp*(spl0-n3+fb_lp*(n3-n4));
n4=n4+cut_lp*(n3-n4);
spl0=n4;

rn3=rn3+cut_lp*(spl1-rn3+fb_lp*(rn3-rn4));
rn4=rn4+cut_lp*(rn3-rn4);
spl1=rn4;

[mccrabney]

found this thread which might help others if they search for this issue. it recommends the mooog 24 pole js filter which is awesome.

https://forum.cockos.com/showthread.php?t=139777

[Time Waster]

The filter module in ReaRack uses this filter. I added code for modulation and the ability to use it as a high pass filter. You can use it as a stand alone FX in the same way as the original Cockos version, or modulate it using other ReaRack modules (e.g. LFO). Get it from the stash. See my signature.