Btw, when learning to fly, don't set up duel rates if you're going to use a buddy box.

When using a buddy box, the instructor uses your TX, and you hold the buddy box. The duel rates ARE NOT passed to the buddy box, it's always going to be 100% throw. So if the instrutor is on low rates, they wind up with less throw than the student.

Exceptions:
If you set low rates to 100% and high rates to a higher %, then the instrutor can have more control than the student. Or, if your buddy box has duel rates, you can set the rates up on the buddy box instead. (I often use an old JR x-347 as a buddy box, so I can set up lower rates for the student's plane).