delay.js

// This effect Copyright (C) 2004 and later Cockos Incorporated
// License: GPL - http://www.gnu.org/licenses/gpl.html
desc: simple delay
slider1:300<0,4000,20>delay (ms)
slider2:-5<-120,6,1>feedback (dB)
slider3:0<-120,6,1>mix in (dB)
slider4:-6<-120,6,1>output wet (dB)
slider5:0<-120,6,1>output dry (dB)
slider6:0<0,1,1{off,on}>resample on length change

@init
delaypos=0;

@slider
odelay=delaylen;
delaylen=min(slider1 * srate / 1000,500000);
odelay != delaylen ? (
  slider6 && odelay > delaylen ? (
      // resample down delay buffer, heh
      rspos=0; rspos2=0;
      drspos=odelay/delaylen;
      loop(delaylen,
         
         tpos = ((rspos)|0)*2;
         rspos2[0]=tpos[0];
         rspos2[1]=tpos[1];

         rspos2+=2;
         rspos+=drspos;
      );
      delaypos /= drspos;
      delaypos|=0;
      delaypos<0?delaypos=0;
  ) : (
    slider6 && odelay < delaylen ? (
        // resample up delay buffer, heh
        drspos=odelay/delaylen;
        rspos=odelay; 
        rspos2=delaylen*2;
        loop(delaylen,
           rspos-=drspos;
           rspos2-=2;
         
           tpos = ((rspos)|0)*2;
           rspos2[0]=tpos[0];
           rspos2[1]=tpos[1];

        );
        delaypos /= drspos;
        delaypos|=0;
        delaypos<0?delaypos=0;
    ) : (!slider6 && delaypos >= delaylen ? delaypos = 0);
  );
  freembuf(delaylen*2);
);
wetmix = 2 ^(slider2/6);
drymix = 2 ^(slider3/6);
wetmix2 = 2 ^(slider4/6);
drymix2 = 2 ^(slider5/6);

@sample
dpint = delaypos*2;
os1=dpint[0];
os2=dpint[1];

dpint[0]=min(max(spl0*drymix + os1*wetmix,-4),4);
dpint[1]=min(max(spl1*drymix + os2*wetmix,-4),4);

(delaypos+=1) >= delaylen ? delaypos=0;

spl0=spl0*drymix2 + os1*wetmix2;
spl1=spl1*drymix2 + os2*wetmix2;