After much research and education I resolved my issue for the enormous cost of $7.69 and some old fashioned ingenuity. Thanks to some enlightening information on the web and here I combined this to make my own. Since I already had an old Adcom speaker selector box I used it and modified it for my purpose by disconnecting the existing wiring from the binding posts, removing the common ground and adding a 4ptd switch and wiring it up to 3 of the existing binding post sets. Naturally the original function of speaker selection is non existent but easily restored by reconnecting the left in place (stored) original wiring and common ground and disconnect of the modification. Best of both world with minimal effort. Works like a charm. Looks good in my rack too. :)