fatsky, It not my wish to contradict you, but while I was buddy boxing, we used the Tower 4 ch that came with the Tower RTF as the instructor radio & my Futaba 6DA or 6EDA whichever it's called as the student box. We assumed the dual rates on the Futaba didn't work either since for one, it wasn't turned on & for 2 the main 4 channel radio didn't even have dual rates, but they did work! As long as he held that trainer swtch down all the features on the Futaba worked. Don't ask me how because I don't understand it, it just did.[sm=spinnyeyes.gif]