What's different between RC1..8 and 9..14?

I discovered that RC9…14 did not work for me.
tried a servo on RC9 , and RC9_Function=4 (aileron, for test) - the servo did not move.
tried a servo on RC8 , and RC8_Function=4 (aileron, for test) - the servo moved as expected.

For 9-14 you have to manually set the end points and center. Try 1000, 1500, 2000 to start with and adjust as required.

.