“They're not accessories, they're tools”: thus said J. R. Boisclair, principal owner of WAM Engineering, politely but firmly, when I asked him if I might include the WallySkater and WallyTractor analog set-up devices in a piece I was writing about accessories. I believe his distinction far from factitious. My Meriam-Webster defines accessory as “an object or device that is not essential in itself but adds to the beauty, convenience, or effectiveness of something else.” This definition surely applies to the Wally, Hagerman, and Riverstone Audio devices under consideration here, but they obscure an important difference. What we commonly think of as audiophile accessories are things that play an active (by active, I don't mean electronically active only) role in the reproduction of sound, whether they're tips, spikes, pods, stands, pads,…