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

Ground loops produce hum, not usually cross-talk audio.

Try the cheap radio shack isolator first. If that doesn't work try
the Royal PAD.

Royal DB-25 attenuation boxes with ground lift solve most of the audio
problems I've had.

www.guitarcenter.com