MUBS:
By the way, before my recent hiatus, back when we were talking about the Aphex Aural Exciter, you were mentioning some one-of-a-kind cassette tapes that you have, which contained some amount of noise / hiss as well as poor audio qualities.
I could process a cassette or two using my Aphex Aural Exciter unit -- gratis -- if you could send me about a CD's worth or so of cassette audio material and a couple of dollars for return postage.
The Aphex unit I have is not the one I pasted a picture of in that hijacked thread on MP3s. The one I use doesn't look as pretty as the new silvery "basic" Aphex Aural exciter (Model 204), so that's why I posted a picture of it instead of mine. Mine is the "older" Model 250 Aural Exciter Type III, which is the full-blown professional Aphex Aural Exciter.
Aural Exciter Model 204
Aural Exciter "Type III" Model 250
http://www.aphex.com/250.htm
I believe you were inquiring about its noise reduction capability. I really haven't done much with its noise reduction capabilities, but what I've found is that it's sort of hit'n'miss depending on what the noise actually is. If it's pure tape hiss, it can and will do a pretty good job with these sort of fixed source noises -- far better even than just using 1/3 octave equalising or notching approaches.
The Type III processes out noise before it fiddles around with adding zing to the dominant content. The bigger bolder zingy content will then further mask over the remaining noise. It's about the closest thing to a standalone "magic box" there is. T.C. Electronics' PowerCore would be the closest and only real competitor to the Aphex Aural Exciter Model 250.