Developer website:
Apple, Inc.
Mac Pro Audio Update 1.1... This update addresses an audio anomaly that some customers may hear coming from inside their Mac Pro computer when using FireWire audio devices. This update is for Mac Pro (Early 2009) computers running Mac OS X 10.6.3.
Requirements
Mac OS X 10.6.3 or laterSimilar Software
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Apple Mac Pro Audio Update User Discussion
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