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I've been studying the diagram I posted of my installation and a question came to me. The signal from channel 6 goes directly to the auxiliary module, but the auxiliary module does not have any wires connecting either to the audio module or the recoil module, so when I activate channel 6, how do the instructions for the sound and recoil reach the modules in question? Is there something missing here?

You have channel 5 connected to RC INPUT 3 on the Audio Module, so that is the channel which will control the sound.

Adrian.