Cornerstone Centurio A Centurio was a legendary officer of the Roman Army. But in the guitar world, that name sounds remarkably close to a different kind of legend: a mythical being that is half man, half horse. The brand-new Cornerstone Centurio takes inspiration from that mythical beast, but takes the concept a step further. Engineered with two fully independent Gain and Volume stages that are switchable on the fly, it delivers unprecedented control over your drive layers. It will push your amp harder and fatter, while leaving your core guitar tone completely intact.