Gnus uses rule variables to decide how to view a file. All these variables are of the form
(list '(regexp1 command2) '(regexp2 command2) ...)
gnus-uu-user-view-rules
sox
to convert an `.au' sound file, you could
say something like:
(setq gnus-uu-user-view-rules (list '("\\\\.au$" "sox %s -t .aiff > /dev/audio")))
gnus-uu-user-view-rules-end
gnus-uu-user-archive-rules
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