I wrote an enhancer some time ago ... maybe I can find it somewhere.
Basically I
splitted a signal in a high-pass and a low-pass part. The lowpassed part
is
waveshaped to generate some amount of 2nd and 3rd harmonic and mixed
with the
highpassed (not waveshaped) signal. This way you add some extra harmonic
energy
to the sound. Notice the freq.cutoff of the lowpass filter should be
sr/6 or lower to prevent aliasing.

Jean-Michel DARRÉMONT 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...).