jsfx writing - crossfeed for headphones (error?)

[drsamjoseph]

what's the error in following lines

desc:Crossfeed for Headphones

slider1:1000<20,20000>Low Pass Cutoff (Hz)
slider2:0<-60,60,0.1>Make-Up Gain (dB)

in_pin:left input
in_pin:right input
out_pin:left output
out_pin:right output

@init
ext_tail_size = -1;
log2db = 8.6858896380650365530225783783321; // 20 / ln(10)
db2log = 0.11512925464970228420089957273422; // ln(10) / 20
delay = 0.17;
fc = 0;
q = 1;
gain = 1;

@slider
lowpasscutoff = slider1;
gain = exp(slider2 * db2log);
fc = 2 * sin(lowpasscutoff / (2 * srate));

@sample
left = left_input;
right = right_input;
crossfeedl = spl1 * fc;
crossfeedr = spl0 * fc;
spl0 = left + (delay * crossfeedl);
spl1 = right + (delay * crossfeedr);
spl0 *= gain;
spl1 *= gain;

[souk21]

left_input and right_input are never defined and always equal 0

[Steviekeys]

Left=spl0;
Right=spl1;

?

[ErBird]

That's not how you do a lowpass or a delay.

[Steviekeys]

I assumed it wasn't finished.

I have some code for oversampled state variable filter, which would work up to about 14Khz, 12dB per octave I think.
I couldn't get my head around biquads.

Is the delay coefficient in mS?
It will need to be converted to number of samples, then used in some buffer code.
Borrow some from another plugin. There will probably be redundant code in it that may need removing.

[mschnell]

I don't get the slightest idea about what this is supposed to do...
Moreover there are lots of filter and volume control JSFXes, that might be combined to do this (whatever it is). Either by using instances of those or be copying the appropriate code snippets (with reference notes) .
-Michael

[Steviekeys]

If this is for sending a delayed lowpass to the opposite channel, I think readelay will do this. Set the width to -100 and delay time and lowpass to taste. Then save as preset.