Both circuits work independently and together only when the kicker is boosting the mule. If the mule is set to boost the kicker then there no sound from the kicker and a high pitched squeal from the mule. Also there is no sound from either circuit in by pass mode.
The power supply is 9v and capable of much higher than 30mA. There were no part substitutions. I have 7 RC4558D and RC4558P chips, tried both but still no change.