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I recently upgraded from my trusty old Turnigy 9X to a shiny new Turnigy 9XR, and had to figure out the channel mixing for it to work with my APM.

There are a few resources on the internet on how to do this (including here on diydrones), but non specifically for the 9XR.

I managed to set my transmitter and APM up such that I have 3 separate switches.

1. The ELE D/R is now my Emergency RTL switch, which overrides all other switches. (This connects to CH7 on APM and is assigned the RTL function.)
2. The AIL D/R is my Auto mode ON/OFF switch, which overrides the 3-way switch.
3. The 3-way switch allows me to switch between flights modes Stabilize/Alt Hold/Loiter.

(Of course you can re-assign the modes to anything you like. But this arrangement works well for me!)

You then have to connect receiver CH6 to APM CH5 for arducopter (or APM CH8 for arduplane). And connect receiver CH7 to APM CH7 for arducopter (I don't believe arduplane has an assignable CH7 for RTL mode, although it ought to have).

Hope this helps someone!

-LPK, ConservationDrones.org