I am guessing that the three wires are wired toan XLR plug, which is the
standard mic coneecetion in profesional audio. Take a look at some of the amps ( I
have a CA12 from Crest) lookat their website for the connections to the am
and it will show how the XLR is connected. I Do not think the diode is
nexcessary. If it has a stereo mini plug on it, you may just want to wire it up as
left, right and ground.  I have a Sure SM-58 on my puter, but I also have it going
through a mixer and Lexicon  effects genereator so all the wiring is already
done.  Hope this helps.

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