You will have to keep the output volume of the CB down low because the AUX input is designed for a low level (headset type) input. CB will go through into the headsets and the intercom will still work and should mute the CB sound. However, you will not be able to listen to the radio or CD while switched on AUX. Other than the intercom in the headset, the AUX source will be the only sound at the headset or speakers when it is selected. You may want to use an external speaker with the CB so that you can have music on at the same time.