Here's an ode to a piece of gadgetry rarely covered on GuitarWorld.com, something that has brought a whole new world of sounds to guitarists' fingertips: the guitar synthesizer, aka the guitar synth. First of all, exactly what is a guitar synth? To quote Norm Leet, who wrote an authoratative feature on the topic for Roland's UK website, "a guitar synth is a synth module whose input device is a guitar instead of a keyboard."