ACM is similar to MP3. Its a technology used to compress audio. Whenever you run audio through virtualdub using the "full processing mode" you are basically trying to "uncompress" the audio, that way you can run it through filters or in your case just save it to an uncompressed wave file. The problem is, VirtualDub doesn't handle ACM very well at all. There are a few patches and rebuilds that work okay, but its just easier to copy the compressed audio out and let some other software decompress it. So try doing a direct stream copy, renaming the extension to acm or ac3 and running it through and audio program, like besweet or headac3, and let that program convert it to mp2.
Hope this help..
-BC
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