Got this recently, and used it a few times. Never gigged it out, active just isn't my jam.
It's a very clean sounding preamp, very versatile.
I chose this setup on the tone knobs:
high mid (top), treble (bottom)
low mid (top), bass (bottom)
That setup per knob made much more sense to me. I liked having the options on this configuration.
The knobs are all black. http://www.audereaudio.com/Classic4B.htm