Got this from the Turnigy discussion site which may help:

"You need to adjust the travel speed in both directions with the adjustment pots. The pots do not correspond with each output channel, they adjust the speed for all three channels and reverse channel 3 only. SW1 and SW2 control speed and SW3 reverses travel direction on Ch3 outuput. Just keep dialing in the #1 & #2 pots until you get the desired speed in both directions. One landing gear servo will need to go into Ch3 and be reversed, unless you have a reversed servo."