This device has found its way into many of Eddie Van Halen's recordings, adding a shimmery velocity to lead passages or a more dramatic swoosh to muted strumming. This phaser is not just designed for guitars; it works well with bass, keyboards and even vocals and appears in all of these guises on Dweezil Zappa's Z album, 'Music For Pets', which hints it is flexible and hip. Although the intensity is fixed, it is possible to vary the speed from a subtle, long cycle to a fast, watery warble and a miriad of vintage vibrations in between.