Snobird,
I finally gave up on the sequencer, and did just as you suggested...tied the gear and an aux channel to the flight mode switch (on the JR12X just in front of the retract switch). Spent quite a while trying to figure out how to make that 3 position switch work and a call to my brother. Finally got it so when I flip the switch to position 1 the gear retract, position 2 the doors close. On the reverse, position 1 opens the doors and position 0 extends the gear. I'm not sure at this point if the electrics are worth all this trouble. Seems much easier to do gear door sequencing with air operated retracts... :-)
I suppose I should just do as my brother suggested, get rid of the 12X and get a DX18...the door sequencing programming on that guy is much better...go figure....