First off, a schematic would be very helpful in reviewing your circuit. As I see it, you have made a conceptual error with your circuit. If I am interpreting your diagram correctly, you haved moved the bass boost filter outside the feedback loop and connected it to the output. The bass boost filter must stay inside the feedback loop, in its original position, if it is to behave as you want it to. Unfortunately there is no easy way around that.
1/4/06 at 12:48pm