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direction field specifies a 3-D vector indicating the aim direction for the sound emitter.
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intensity field controls the volume of sound emitter. Value 1.0 sets te volume to maximum and 0.0 reduces the volume to zero( turn off the sound emitter).
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source field specifies the sound source for the sound node.
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priority field gives the author some control over which sounds the browser will choose to play when there are more sounds active than sound channels available.
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Browsers should support spatial localization of sound as well as their underlying sound libraries will allow. The spatialize field is used to indicate to browsers that they should try to locate this sound.
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minFront and minBack determine the extent of the full intensity region in front of and behind the sound.
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