The left part of the circuit is an ordinary bass and treble tone control. 
The right is the parametric bandpass filter. The potentiometer P is a double 
ganged linear type and controls the middle frequency. The Q value (frequency 
peak bandwidth) can be adjusted with the logarithmic type pot. You should 
connect it so that if the pot is turned full right (max) you get the maximum 
Q (narrow peak). The damping or boosting grade can be controlled with the pot 
down in the middle.
                                                     
When to choose OP-amps I suggest one TL 072 and one TL 074 (equals six OP-amps), 
or two LF 351/LF 356 and one LM 4136 or a combination of them.

                                                                       
The parametric bandpass filter is based on one by Craig Anderton.
                                                    
The circuit can be supplied with +-9 to +-15 V to get the distortion limit high 
enough. I use this circuit for example after a dist box or as a electric bass 
equalizer to add or eliminate some frequencies.