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You didn't say which audio compression you used, so I assume MP3 (maybe VBR). You can open your AVI in NanDub, then File / Save WAV to get the MP3 file (having a WAV header, and a .WAV extension, if you didn't change it).
Use a tool capable of changing the volume in your MP3 file without re-encoding (I think there are tools like "MP3 normalize" or similar).
Then open your AVI again (if you closed it in the meantime), and mux the files again using NanDub. Choose the MP3 file under the audio options. Make sure you selected "Direct stream copy" under both, Video and Audio. Then File / Save AVI.
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