> Date: Wed, 01 Oct 1997 14:15:47 +1000 (EST)
> From: Leon Zadorin 
> Subject: what is "nlfilter" ?
>
> was just wondering if anyone has the actual code for "nlfilter" - csound
> version that I have (on a Mac non fpu 68k) doesn't seem to have such ugen.
> So I was thinking of actually doing it "line by line" (sort of code it
> within the instrumet)...

You'll find code for all of Csound at either of
   ftp://ftp.maths.bath.ac.uk/pub/dream/
   ftp://ftp.musique.umontreal.ca/pub/mirrors/dream
in file /newest/csound_new.zip
(this is v3.46 which is the current one, 3.47 is due Real Soon).
The current binary (with nlfilt opcode) is in directory
../platforms/mac/
There is also a mac version at Mills, but I'm not sure if they
have any 68k version, or are just doing PPC.

The nlfilt algo is given in docs as:

 	ar	nlfilt	ain, ka, kb, kd, kC, kL
 Implements the filter Y{n} = a Y{n-1} + b Y{n-2} + d Y^2{n-L} + X{n} - C

regards,

	re