FCX & Compressor 4 - output audio is hiss for older video/audio files

Hello - I'm using FCPX and Compressor 4. I'm compiling video files that go back to thirteen years old. FCX has been handling the files very well. They all look and sound as expected in the viewer and project playback. I've mixed the audio with an additional soundtrack and am happy with the results. However, when I move the project to Compressor (or even if I export it using FCX) the older files look as expected, but have a terrible hiss. All other audio is filtered out or overwhelmed. All the newer files sound just fine. The file types are a mix that were captured using over a dozen different digital cameras.
Can anyone recommend an appropriate audio output setting that might alleviate my problem with hiss? I've searched all over, but don't see any similar question.
thanks!
Alex

Below are screenshots the Quicktime Inspector and FCP HUD for two of the troublesome clips. They play and sound fine when previewing in FCP, it's just the saved files that sound terrible!
I removed the soundtrack and exported to Compressor. The resulting file had hiss for all of the same offending clips.
Thanks for your help with this frustrating issue.

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FCX & Compressor 4 - output audio is hiss for older video/audio files

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