If you are looking for a manual for a radio that explains how it will be programmed to do the mixing, many radios are different. For an example go to www.horizonhobby.com and look at the manual for the JR 6102. There are also Futaba, Hitec, among others to look at.

http://www.horizonhobby.com/Shop/ByC...odID=JRP6644**

There's the link directly to the radio manual and programming guide. You can read about the setup and exactly how to program the mixing.