from “Output module settings”:
“Note: Before rendering, check the Audio Output settings in the Output Module Settings dialog box to ensure that they are correct. To render audio, Audio Output must be selected.”
regarding audio in previews:
Are you using RAM preview? See “Preview video and audio”
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Todd Kopriva, Adobe Systems Incorporated
putting the ‘T’ back in ‘RTFM’ : After Effects Help on the Web
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