capacitor value in Audio Delay BBD device.

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Joined Jul 15, 2008
Hi, I have a comercial circuit for Audio Delay (BBD device), it have two filters LPB at input BBD and one filter LPB at output (all LPB about 2.7KHz). Filters sure cut high audio frecuency and clock frecuencies . I ´m modifyng the circuit in order to increase audio frecuency (also I must increase clock frequency at twice), is simple for me to change the cut off frequency for filters, but after filter-output there is a Op Amp used like a inverter amplifier, it have a capacitor in paralell to resistor feedback, I guess it must be for filter something, but I do not remember how calculate their value (maybe so simple like 1/2PiRC).
Please Can someone help me ?