Jean-Michel DARRIMONT wrote:
> 
> Hi,
> 
> Does any one knows how to simulate a spectral enhancer(Aphex type) in CSound.
> Are there orc&sco on this subject around there or, more generally, is there
> any documentation on the subject (books,web, usenet,lists etc...).
> 
I read an article many years ago in Electronic Musician describing a circuit
that emulated it quite well. The basic concept is to highpass filter the
input signal and then soft clip this signal (distortion). This resulting signal
is then mixed with the original signal.

The original article was by Jules Ryckebusch (mailto:ryckebusch@aol.com). I 
believe there was recently a discussion about it on the synth-diy mailing list. I
think he redrew the original schematic and may have the original article
posted somewhere. This issue of EM was still in the days when EM was associated
w/ PAiA (http://www.paia.com), you may find something at their site.

I remember that the original circuit was good enought to elicit a response from
Aphex stating that the design was patented. Thus the IBM patent server may
be another good place to look.