In the past few years, sound has become an increasingly important element in games. As game sound effects have become more advanced, designers have started using sound as a key element. It's now more important than ever that games feature a wide variety of diverse, realistic sound effects, as well as high-quality, professionally recorded speech and dialogue. Here is the winner of Best Sound of 2001:
Clive Barker's Undying

Publisher: EA Games
Developer: EALA
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One of the year's first big surprises, Clive Barker's Undying is an occult-themed first-person shooter with a truly creepy atmosphere made possible in large part by the game's superlative audio. All of the game's sound effects are original and distinct. Though the game's visuals are impressive, the detail found in its audio is simply extraordinary. As a typical example, you can clearly hear subtle effects, like how one deadly bullet at a time is loaded into the chamber of your trusty revolver until the chamber flips shut with a well-rehearsed, satisfying "clack." Undying's sound really helps bring the game's memorable setting to life--a haunted mansion in Ireland, filled with innumerable horrors lurking in the darkness.
Other Nominees:

Black & White
Return to Castle Wolfenstein
The Sims: Hot Date
Soul Reaver 2