FlySky FS-I6X - Blend for Max Forward Speed

[frizzen]

I don't know programming on the fs-i6x, but the original fs-i6 lets you set up a switch for Normal and Sport modes. So once that's enabled and set on a switch, in Normal you can set your throttle channel epa to like 20%, then throw that switch to Sport and have it at like 100% epa. I don't remember seeing anybody doing something like a live epa off a VR knob.

What are you trying to do with the master / slave channels?

http://runamok.tech/RunAmok/flysky_i6.html
Go down to Dual Rates

Elevon-mixing might work well for the master slave setting you were wanting?