I remember some years ago, a tv network in the uk showed two of the guys from 10cc, with their new invention, it was a device strapped to the neck of a guitar, that gave a haunting violin sound, they called it a "gizmo" at the time. i should think this "sweetwater" is the modern electronic version of that device, albeight, their device was very mechanical, and i would imagine detrimental to the strings of any guitar, it was used on