I know nothing about your radio but normal operation is 1ail. 2 ele, 3, throttle and 4 rudder so you have the rest to assign and mix. Futaba has a FAQ site and a support to ask questions, EVO? I only recall one person using it so what type of mixing it has is a mystery to most people. I almost bought one when I saw it advertised but I went with the Futaba.
I have seen someone here post in the last week using one, perhaps he will come on. Unless it was you? That could be a problem!