RE: 9CAP forgets trainer settings
Off only means that the switch is off. Watch the screen and transfer the trainer switch.
What is wrong with line 2?? Even if you are mixing channels, IE flaperons or dual servos on ailerons, the four basic functions are all that are active, unless you are using a second 9C as the trainer and then you could map flaps and such. Basic buddy box use gives you just the four channels.
Don