One person tells me not to use Y connectors to the reciever but to put one connector in the elevator terminal and the other elevator connector in the Aux terminal and the same for the alerions and to mix them in my radio which me and know one else can figure out
h9 instructs for US120 quad flaps using JRXp8103 (9 pages) show using the GLID pre programmed for your model.
Shows rt ail to ail chan
' left ail to gear chan.
(US has flaps and they show using Aux 1 Chan for rt flap and Aux Chan 2 for left flap) This may be an option for your elevators if your have split elevator.
I'm working backwards from the dual servos with Y harness to allow incorporating FMA Co-Pilot which has only one input plug for the ails. Lose some options but hope the Co-Pilot will help keep me out of trouble.
Hope this helps