Flying mode 4 today only requires plugging in your rudder servo into the aileron Rx channel and vice versa. Programming of switches on Futaba (although I'm not a user) should allow you to set things like dual rate switches, mixing and so forth. The only hassle may be that you have to think rudder everywhere it says aileron and vice versa.

It should be a simple fix for Futaba to supply you with an M4 Tx. It's a software variable swap, recompile and firmware zap.

I learned on M1 and made the switch to M2. M4 for an M1 flyer is akin to flying standing on your head... [&:] Can't quite fathom it...

David

PS Welcome back!