How do I repair a broken M4A audio file?

I used the program Audio hijack Pro to capture some audio of a Skype conversation. But in the middle of the conversation AHP crashed, and I'm left with an incomplete and corrupt m4a audio file. It is 6,7MB big, which indicates to me that the audio is still there, but not accessible. No program I tried can open the file or repair it.
I tried vlc, quicktime, soundtrack pro, windows media player, fission, audacity and some smaller tools like BeSliced...
Please help, I don't want to loose 30 minutes of speech recording!

If your presentation is such that you want to recover it rather than reconstruct it, you could consult the Apple documentation on the Keynote document structure. That said, I have never had much luck directly editing the XML file, and I have grave doubts about the efficiency of such an endeavour. If you do go about it, I would first try deleting all but one slide from the XML file, and see if you can get the presentation to open at all, then build up the file from there. (Obviously you should first make a copy of the presentation and keep that separate before editing the XML files.)

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http://help.apple.com/garageband/mac/10.0/#gbndfb96a96f
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<E-mail Edited by Host>

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the code
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How do I repair a broken M4A audio file?

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