[sdiy] tonal tilt

[JH.]

>Sounds like a response one would get by simultaneously turning the bass
>down, and the treble up.
>It could be implemented as simple as using a classic tone control
>circuit with a dual ganged pot. One gang for the bass, one for the
>treble, wired so that turning the pot turns the bass down and the treble
>up or vise-versa.

I'd build two fixed networks, one emulating a baxandall network with 
bass -1dB / treble +1dB, the second emulating the same network with bass 
+1dB / treble -1dB, and use a sinle potentiometer to crossfade between the 
two outputs.
I bet this can be all passive, with less than 10 resistors and capacitors.

JH.