If the sound isa loud feedbak type, you probably have a short in the wires somewhere. Most likely the short will be a the connection point of the drivers connection to the bike. It is possible that the control module is where the bad connection is, but I doubt it, that is a stationary point and the drivers connection is the most used and most ofted wears quickest.If it is at the module, you will more than likely need to go in under the ferring to find it.
If it is a buzzing noise (kind of like a car radio without resistor type spakplugs) it is something you will have to live with. Mine does it and I just turn down the intercom to a point where it is acceptable and I can still hear my passenger. When you are riding, hit your brakes to the point where your brake lights come on and see if the noise stopps. If it does,you may be able to bypass your ignition switch and eliminate the engine noise.