band-pass filter

[Julle]

I hav build the Hornet fuzz face pedal.

And now i want to add a bandpass filter i have found a circuits on this page:
http://www.allaboutcircuits.com/vol_2/chpt_8/4.html
It seems to work but not perfect the way i want it to do...

Im not shure how big my Capacitor and my resistor shud be...
I have tryed a 1,5 mF and a 2,2 mF and tow 10 k linear pot witch worked like shit, i have also tryed with som smaller witch gave a better result.
But still not good...

Anyone have a way to calculate it, or somthing?
Sorry for my bad english..

[Paul Perry (Frostwave)]

I can't calculate it, but if anyone can, they will want to know what your desired lower and upper frequencies are.

[slacker]

There's a filter calculator here
http://www.muzique.com/schem/filter.htm where you can play around with cap and resistor values to see how they affect the frequency.