//sliders have midi resolution

desc:  Simple 2-pole LP (Mono)

slider1:127<0,127,1>frequency
slider2:0<0,127,1>resonance
slider3:63<0,127,1>smooth res
slider4:0<-24,24,1>gain

@slider
q = slider3/(5+1/3);
c = pow(0.5, (128-slider1) / 16.0);
r = pow(0.5, (slider2+q) / 16.0); // q=slider3=24
gain=10^(slider4/20);

@sample
input=(spl0+spl1)*0.5;

v0 = (1-r*c)*v0 - (c)*v1 + (c)*input;
v1 = (1-r*c)*v1 + (c)*v0;

spl0 = v1*gain;
spl1 = v1*gain;
