I just recently changed the crystal in my hitec reciever so i can fly my LT-40 with my Airtronics RD6000. I had to change the shift from a + to a - so it would work with the reciever. The only problem now is that my stepdad wants to see wut its like flying rc. Yesterday i was messin around after i changed the crystal and hooked up the buddy box. When i switched it over from the master to the buddy box, everything went crazy like before i switched the modulation. This has me stumped. I thought the buddy box runs off everything from the master ( ex. frequency, modulation etc). As soon as i let go of the trainer switch everything went back to normal and i could control everything with the master. Any help on this would be helpful. I emailed airtronics but havent gotten anything back yet.