How do you wire atrb-x2 echo board in a cobra 29 cb i was told the white wire inside the radio is the audio wire mine does not have awhite wire on the mic con. on the inside

Don't worry about wire colors. pin 1 is ground. some mic's need two wires for ground depending on the PTT switch used. pin 2 audio. pin 3 TX pin 4 RX.. thats all there is too it. once you know the pins all radios are easy. galaxy/connex/genlee same pin outs except pin4 isnt' needed for RX but can be used for 9v dc to power micropohnes.