[sdiy] active fluctuating treble boost

[anthony]

Oh I forgot to mention: I think he's right about the Aphex Exiter. There's a 
schematic for one online somewhere. If you can't find it I can mail it to 
you.

> (Actually, I would assume that Aphex exciters and such already work in a 
> program-dependent way -- adding highs only when they are missing -- and 
> I'd bet that it's more sophisticated than a simple sidechain thing.)