No Audio from the headphone plugin

I've tried plugging my ipod into three different types of speakers. I'm not getting any sound coming through any of the speakers.

Do you have a link to any documentation on that
functionality?
I don't believe the standard headphones are equipped
with a built-in microphone, so I don't see how any
iPod could pass that portion of your test.
http://www.tech-recipes.com/rx/1339/ipodhack_use_the_ipod_headphones_as_amicrophone

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