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Which file formats does recording text-to-speech in OS X support?

Speech using the say command can be recorded like this: say -o hello.aiff 'hello world' What other formats are supported besides aiff? I already tried wav and mp3, and they don't work.
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vote
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How to record text-to-speech in OS X?

When using the say command to speak text in OS X, how can the output be sent to a file so that it can be played back?