Using the line outs from my ipod and feeding to a sure electronics 2*8W @ 8ohm/4ohm MP7720 D-Class Audio amplifier. Amp feeds the 4ohm stereo speakers in my ford ranger. Sound is great but volume is fixed and i cannot control. discovered that i need a pot, (dummy=me). using car voltage=12v. amp can deliver 8W into 2-4ohm/8/ohm at 24V max. can anyone suggest a brief spec for a stereo pot that i should get. they are listed at the radio shack site with associated resistance ranges. i don't have the actual amp circuit but a suggested circuit for the MP7720 indicates athe audio input feeding a 1uf capacitor in series with a 10kohm resistor. any help would be greatly appreciated.