Garbled audio after compression

I'm fairly new to Final Cut Studio, so forgive my ignorance if the answer to this problem is obvious. When I send a project to Compressor for Quicktime formatting, the final product audio sounds garbled. AC3 dolby codec sounds fine, but Quicktime files are a mess. Any insight would be greatly appreciated.

What are your
• sequence settings in FCP,
• settings of your video and audio.
Select your footage in the timeline, hit command-9. Post the info.

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