Bass Guitar help Circuit help

I Built the circuit for Guitar Control (https://redcircuits.com/Page69.htm)

i Wanna use it for my Bass Guitar.

and it works fine... but there lots of clipping...(the breaking and cracking noise, thunder noise ) mostly in the beginning... I checked all the connections and all the POT's but still the Clipping occurs....

and when i turn it off there's a buzz and then Be comes silent...

other wise the sound is awesome... it rocks...

Can you tell me how to stop the clippings... is there's any solutions for the same...

https://redcircuits.com/Page69.htm



spec:


P1,P2_________100K Linear Potentiometers
P3____________470K Linear Potentiometer
P4_____________10K Log. Potentiometer

R1____________150K 1/4W Resistor
R2____________220K 1/4W Resistor
R3_____________56K 1/4W Resistor
R4____________470K 1/4W Resistor
R5,R6,R7_______12K 1/4W Resistors
R8,R9___________3K9 1/4W Resistors
R10,R11_________1K8 1/4W Resistors
R12,R13________22K 1/4W Resistors

C1____________220nF 63V Polyester Capacitor
C2,C8___________4;7 63V Electrolytic Capacitors
C3_____________47nF 63V Polyester Capacitor
C4,C6___________4n7 63V Polyester Capacitors
C5_____________22nF 63V Polyester Capacitor
C7,C9_________100µF 25V Electrolytic Capacitors

IC1___________TL062 Low current BIFET Dual Op-Amp

J1,J2__________6.3mm. Mono Jack sockets

SW1______________1 pole 3 ways rotary or slider switch
SW2______________SPST Switch

B1_______________9V PP3 Battery

Try to add a bandwidth-limiting capacitor in parallel with R4 ..
Perhaps somthing like 47pF ..

Regards,
IanP