The sequencer is probably programmed to operate up at somewhere < 1520 resolution and operate down at somewhere > 1520 resolution or visa versa. Mid position is 1520 resolution. Other than reversing the channel, I am not sure if you can actually change the transmitters output on a switched channel. You would have to change the program in the sequencer to operate up and down in 1/2 of the normal resolution (e.g. Up at 1520 and down at ~1000). That would leave you > 1520 to ~2000 to do something else with.

But maybe someone else will chime in here.