Audio Types and pleasing EPUBCHECK

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Started with WAV files. Converted to MP3; declared as type audio/mpeg; epubcheck-3.0b4.jar pronounces those references "non-standard media-type" or "non-standard resource" although EPUB Publications 3.0 appears to approve audio/mpeg.

Converted same to M4A; declared as type audio/mp4; epubcheck-3.0b4.jar again is unhappy.

How to please epubcheck-3.0b4.jar with an audio file?

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