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I find the wing flaps of the Celestial Steed flying mount annoying. They sound like someone waving a piece of cardboard around in the wind, and I was disappointed that I haven't cared to ride it much since I got it. This tiny sound mod addon will make your Celestial Steed's irritating wing flaps sound like the whisper wings of Gryphons and Windriders.

To Install: Extract the "Data" folder contained in this zip file into your World of Warcraft folder. This will create a folder called "Sound" under (inside) the game's "Data" folder. When the game runs it will substitute any sounds it finds there for equivalent sounds in the game. (See screenshot images for illustration.) Do not use the Curse Client Auto-installer. It is a known problem that it does not handle sound mod addons properly.

To Uninstall: Rename or delete the "Sound" folder under (inside) your game's "Data" folder.

Notes on Installation: Zip/Unzip programs vary in how they work. The end result must be that a folder called "Sound" is created under (inside) your game's "Data" folder. Restart game after installation. (If your Unzip program is confusing you, try unzipping to your Desktop and then simply copying the "Sound" folder to your WoW "Data" folder.)

Other addons by Skulhamr of Trollbane:
-Evil Enters Azeroth - Announces to Azeroth that Evil Has Arrived with a Beat You Can Dance To
-Evil Enters Fight - Announces to Azeroth that Evil Has Arrived and warns "Prepare to Fight!"
-Evil Enters Whips & Hugs - Announces to Azeroth that Evil Has Arrived with Whips & Chains
-Welcome to Azeroth - Welcomes you to Azeroth with a driving beat & dead people
-Dead People - Visual & audio sightings of dead people on player death
-Resurrection - Welcomes you back to life with a rousing cheer & a cool movie reference
-ScreenShot - Confirms when your screenshots are successful (visual & audio)
-XP Gain - Cheers you on XP gain with a rousing cheer and print to scree
-Core Hound Lava Sound Quieter - Changes the roar of the lava seam on his back to a gentle crackle
-Core Hound Pup Silencer - Silences the barking of the Core Hound Pup
-Core Hound Pup Quieter - Keeps the antics but quiets the strange barking of by 20db
-Core Hound Puppy Sounds - Replaces the strange barking with playful puppy sounds
-Spectral Tiger Sounds - Makes all your tigers sound like they're Spectral
-Loque'Nahak Roars - Gives all your tigers the roar of Loque'Nahak
-Hush Up That Yawning - Silences the irritating yawning and slobbering of your tigers
-Yawn Roar - Replaces the yawn & slobber of tigers with the yawn-roar of the Swift Spectral Tiger Mount
-DeathWing Yawns - Your tigers will sound like Deathwing yawning
-No CardBoard Wing Sounds - Replaces cardboard sounds of Celestial Steed & Flameward Hippogryph
-Gondria Finds Her Voice - Gives Gondria the roars of Spectral Tigers
-Worgen Howls - Substitutes Eerie Wolfen Howls for Sniffs & Snorts
-Worgen Sniff Eliminator - Eliminates the Sniffs & Snorts of Worgen
-Snake Trap Death Screams - Replaces pitiful death sounds of snakes with a more lighthearted demise
-X-53 Rocket Quieter - Reduces the rocket roar while flying and she purrs while idling
-Deep Throat Shotgun - Gives a deep, throaty sound to your gunfire (Remington 12 gauge full-choke)
-Tiger Cub Roars - Changes your tiny tiger cub's slobber-yawn into the roar of the Swift Spectral Tiger
-Tiger Cub Silencer - Silences your tiny tiger cub's slobber-yawn
-Pandaren Vow of Silence - Reminds your Pandaren Monk Pet of his Vow of Silence
-Pandaren Vow of Quiet - Reduces the volume of your Pandaren Monk Pet by 20db
-Water Elemental Silencer - Silences the bubbling water sounds of Water Elemental Pets
-Fox Howls - Adds some foxy howls to your fox pet's attack growls
-Fox Wolf-Howls - Adds some wolf-howls to your fox pet's attack growls
-Pug Muzzle - Muzzles the yips and yaps of those frisky little Perky Pugs
-GyroCopter Quieter - Takes the volume of the GyroCopter sounds down by 20db
-GyroCopter Silencer - Silences the sounds of the GyroCopter completely
-Flameward Hippogryph Wing Whisper - Whisper wings for your Hippogryph
-Celestial Steed Wing Whisper - Whisper wings for your Celestial Steed
-Naga Quieter - Reduces Naga hisses by 20db
-Singing Sunflower Silencer - Silences the songs of the Singing Sunflower
-Singing Sunflower Quieter - Quiets the songs of the Singing Sunflower by 20db
-Pebble Silencer - Silences the rock-grinding sound of little Pebble
-Pebble Quieter - Quiets the rock-grinding sound of little Pebble by 20db
-Enchanted Broom Silencer - Silences the brushing sounds of the Enchanted Broom
-Enchanted Broom Quieter - Quiets the brushing sounds of the Enchanted Broom by 20db
-Frigid Frostling Silencer - Silences the grinding sounds of the Frigid Frostling
-Frigid Frostling Quieter - Quiets the grinding sounds of the Frigid Frostling by 20db
-Argent Gruntling Humanizer - Replaces the weird grunts with human child laughter
-Argent Gruntling Silencer - Silences the strange grunts of the Argent Gruntling Companion
-Mechano-Hog Quieter - Quiets the roar of the Mechano-Hog motorcycle by 15 decibels
-Mechano-Hog Silencer - Silences the roar of the Mechano-Hog motorcycle completely
-Loque'Nahak Quieter - Quiets Loque's roars by 5 decibels

Note: That's the first 50 ... but on Curse.com, you can see the rest of my addons (arranged alphabetically) by doing a search for Skulhamr or by simply clicking my name.