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Only one input line is active at a time. If the switch SA fails, the last line will become True, which may not
be the case if the Aile Hi and Elev Hi switch positions are set to SA↓.
7. Determine the interaction between the input and the channel:
For example, CH1 moves up and down.
CH2 right up and down.
8. Convert the interaction to a mix definition:
CH1, CH2 will have two mixing controls, the source is the "Ail" and "Ele" inputs.