The Refractor Professional Overdrive is a clone of the Klon® Centaur Professional Overdrive and its successor, the KTR.

While the original Centaur was buffered bypass, the newer KTR added the option to switch between buffered bypass (called “Almost Always Better” by the designer) and true bypass (called “Almost Always Worse”). There were an overwhelming number of requests for this to be added to the Refractor, so this updated version implements the switch.

As of its release, the Refractor is the only DIY version of the Centaur or KTR that uses the correct true/buffer switch wiring from the original unit. Several other projects use a simpler wiring method that does not preserve the original circuit in buffered mode, which was one of the inventor's stipulations.
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