Hi Dave Commercial systems exist - QSC's RAVE system (Routing Audio Via = Ethernet) was the first http://www.qscaudio.com/products/amps/rave/rave.htm Now a standards body has been established called CobraNet see their page = at http://www.peakaudio.com/cobranet/ I tried this a few years ago, but gave up when I saw the prices of the = QSC boxes Cheers Mark ------------------------------------------------------------------- Mark Hull Engineering/Technical EMS (Africa) (Pty) Ltd PO Box 1026, Melville, 2109, South Africa Ph +27 11 482 4470 Fax +27 11 726 2552 -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu