OK This is my question,I have a u can do 46 it requires two servos for elevators,ok reading the manual it states i can set these up threw pmx1 or pmx2 programmable mixing, (this is what it states ( you can use both pmxs to create a custom dual elevator function,where you use two servos for your elevator control,one for each side), but dosent explain where two install the slave extension the only open slot is 5 for landing gear,please help me with this one im tearing my hair out , i tried to use channel 5 but i get no reaction what aim i doing wrong , i guess i could buy a servo reversing harness but im determined to figure this radio out if its even capable , IT SAYS IT IS . please help me ..... BILL