ORIGINAL: Flying Geezer
BETO9, you can keep a trainer program in your transmitter that matches the 9C and go to that program to calibrate to a 9C.
There are no problems when I use the 12FG as a student box. I had that, one model that emulates the 9CAP.
The problem comes when you want to use an existing model in your 12FG as a master for a student holding the 9CAP. If the channels do not match with the 9CAP then you have to change the assignments in the 12FG and re-connect your receiver in the plane to the new channels.
Oh well.... at least I think the mixes remain the same... I think?!