Skype can actually sound pretty decent. Esp if you skype them, to their land line. But I
guess that's moot if they are insistant on using a 'puter on their end. At the risk of
stating the obvious, I'm assuming you simultaneously track your end with a nice condensor
mic. Then if you two manage not to talk over each other you can edit out the skype track
in favor of yours during your parts.
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Gear list: If you can't find it, grind it