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Clearly no one announcer is gonna please everybody. Some people prefer a deep, baritone, high-fantasy narrator while others want a higher energy sportscast theme, soothing female voice, etc.
Just leave in the default sound files, but allow users to replace them with local sound clips, one for each announcement (double kill, triple kill, streak x1, x2, etc.).
Not only will users be able to port their favorite pre-existing sound files (UNREAL TOURNAMENT YEAAHHHH or perhaps the HoN sounds), but popular user created sound sets could even be distributed among the player base.