First thing to make sure is that you need to restart the game when adding sounds (they get pre-loaded).
The next thing is to check the volume. Another big hint is that if you add, say, a new cheer sound, do you get cases in game where you expect to hear a cheer but don't? That's a clue as to whether the new sounds are tried to be played but simply too quiet and cannot.
Finally, if you enable the trace debugging in settings, when you start up the program and go to play a game, we list in the log file all the sounds that are loaded. That will say if we actually found your new sound files or not.
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