Source:  Press ENT in this field and over 100 possible input sources are available in the choice box using +/- to scroll, including all sticks, switches, sliders, trims,  telemetry, and other channels. Notice that this provides opportunity to use an otherwise idle channel to work up another combination that can become a switched input source for an active channel.  Truly a remarkable flexibility.  The default source for our IAil channel input line is the raw Ail stick.  That works fine for our purposes and will be same for all three input lines that we will set (3D, Hi, Lo).

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