On radios equipped with the three position flap switch, using it instead of the default gear switch is a nice improvement you can make when flying the Carbon Cub. I struggled to figure out how to program this, and had to contact Horizon to get the exact instructions. In my Carbon Cub post I did mention this, but here are the exact instructions.
Select wing type DUAL AILE / SINGLE FLAP (the AUX1 channel is simply ignored by the receiver) (***Do Not! change the receiver programming to AUX1 for dual aile/flaperon).
This will force the FLAP system to the GEAR channel.
Then set the NORM position to -100% (yes, that minus 100%)
The MID position can be set to a position of your choosing for take off flaps
The LAND position can then be set to 100% … *** Do Not! exceed 100% (actually never do this on any linear servo)