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Attenuator needed to switch speaker with earbud?

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My question here does not match the title of this post because I changed my question.

Do I need an attenuator to communicate a headphone jack with a microphone jack on separate devices? I'm trying to communicate a pair of LBC6K - Laser Beam Audio Communicators (described at http://www.ramseyelectronics.com/cgi...tion&key=LBC6K) with - if a Razor USB Pointed Earbud has a microphone, a pair of Razor USB Pointed Earbuds (described at http://www.target.com/Razor-USB-Poin...766731-7489462) - so that I can allow two hosts to communicate with a laser beam.
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