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http://www.whirlwindusa.com/selec.html Whirlwind Music Dist., Inc. 99 Ling Road Rochester NY 14612 585 663-8820 888-733-4396 (toll free - U.S.) 585 865-8930 (fax) From: http://www.zzounds.com/item--WHRSELECTOR Whirlwind Selector A/B Box $89.95 Thanks to our patented, state-of-the-art optical switching, there's no added noise, pops, or crackles. [[ Not cheap, but it seems to be the only a/b box out there that's silent. RC ]]