RE: Maneuver Caller/Recorder
If you fly Futaba 14Mz or 18 MZ, you can do it easily by loading a sound file into it and assign a switch to pause, play. (I m not near my radios right now so I don't remember the exact sequence of doing it, perhaps others will chime in on it)
I have seen others do it with iPod type players but am not sure of if or how they switched them.