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G.S. Wyllie Xylo

The G.S. Wyllie Xylo isn't mentioned at G.S. Wyllie's web site.  The only thing I know about it is that a user review at the Harmony Central user review database called it a "two-knob proto Wylo Deluxe."  The reviewer called the knobs volume and fuzz, and said in the absence of the tone control the Wylo has, the Xylo sounded great with a Strat but got muddy with humbuckers.  The reviewer wrote that the Xylo had already been discontinued in 2002 when the review was written.