The Aphex Aural Exciter processes esp. vocals on some recordings, I
think.  I'd read references to it for a while, some deprecating, but
never knew much about it.  Other rec.audio messages have compared its
effect to tube amplifiers' second harmonic distortion spectra.
A transistor may generate higher order odd harmonics the ear abhors. 
A valve or vacuum tube makes more harmonics that are even multiples.
I haven't experimented much with this!
 Sounds like an education, tho.
Thanks again to -Zeitgeist- for the excerpt, tho I gave the wrong area
code in the last message, it's 972. 
-----------------------------
(cut)
The essence of the ACOH even order distortion generator is a precision
half wave rectifier. We just fed variable amounts of precision half
wave rectivied signal back into the main feed.
(cut)
 
> I realise such a device can be built using a handful of cheap
> components, but having limited time and equipment, and no access to
> the AES journals you are referring to, I might consider buying one if
> the price is reasonable.
You might want to call David Clark at 1 810 305 5534 - he is the one
who introduced me to the device, and he runs an audio engineering shop
that custom builds items.
-----------------------------  
...
 * ATP/qwk 1.42 * TV advertising is the rattling inside a swill bucket.
---
 * KMail 3.10m  1996:  The year of the BBS!
--- QScan/PCB v1.19b / 01-0530
---------------