I have been flying for a good while now. I have never used the expo option in my radio, and I really don't even know what exactly it does. I can't find my manual to read up on it so I thought I might as well ask. I have been trying to get into 3D but I do not think My set up is correct to do the maneuvers. Could the expo be why I can't do the maneuvers correctly? I just want to know what it does, and how do I know when to use it. Thanks for any information. Justin.