On Fri, 09 Jul 2004 15:42:27 GMT, Ron Hardin
wrote:

My intuition is that it's a ground loop in the audio path. Try
unplugging audio from the other computers and see what happens.

If the crosstalk goes away, I'd try a radio shack audio isolation
transformer ($15) in the audio lines to the computers.

Ground Loop Isolator 270-054

Thanks all, the problem was a ground loop. Radio Shack's ground loop
isolators did the trick, all of the crosstalk is gone!

Thanks,
Gordon