Dayton Audio APA-102 Schematic, Anyone?

I jut picked up one of these and would like to modify the "bass/treble" control portion. It looks to be op-amp based, so I imagine it'd be easy to tweze-off the surface mount components - or piggyback - and change the filter frequency to what I need.

Anyone have access to the schematic set for one of these APA-102s?

It's not so simple to find on line... If just the board with the tone controls on it, of course that'd be great.

Thanks!