I use for test purposes the Spektrum AR637T receiver in connection to Spirit Pro. It's the same receiver like AR6610T but it got gyro too. (I will use this receiver in other model later.)
Spirit Firmware 3.1.0.

This receivers got 6/7 physical output channels and in SRXL2 connection they got internal 20 channels, which can all be used by Spirit.

When I connect the receiver to Spirit Pro, in Spirit Settings -> General -> Button Channels, I can use for basic controls like cyclic, colective, pitch just first 7 channels, although Spirit got access to rest 13 channels. It would be good to use higher channels 8-20 for these basic heli controls, because then I can use ON RECEIVER the first physical output channels for other physical accessories like gears, gear doors, lightning etc. Now are these channels reserved for basic controls.

Thanx.

Max