Good question and one that is often overlooked. The radio was on model 3 and is displayed as SSE. I had two great flights and was on the 3rd. The first thing I did after it went in (well maybe the second thing ) is look at the display to see SSE. To change models on this Tx you have to hold in the Mode and Select buttons for 2 seconds. One thing coming to mind as I type is an odd occurrence while setting up the model the day before. While looking at how to enable the flaperons I noticed that the radio defaults to the On mode. The aileron control rods were set up and adjusted for neutral a week before. When I inhibited the flaperons the left aileron, ch. 6, went to the extreme up and the right moved some which is opposite the roll that creamed the aircraft. I re-enabled the flaperon mode but made sure that all settings for movement were set to zero as I didn't want to use flaps until I was well practiced with the model weeks later. Any of you 6EX guys out there ever see the same thing?