Here are a couple more tasks you may or may not know about.
977 - Clear (more than 980, less than 981)
980 - Clear
981 - Clear all (full manufacturer reset)
990 - Code blink out for current device
994 - Key move
996 - Fav scan setup
997 - Modem download
All clears are actually different levels of the Manufacturer resets.
And No, the WAV file has to be for the remote is was created for.