Mark Certain is definitely bold when he boasts that his CertainBass Varitone is the very best varitone on the planet, but when examining the range of tones that the unit is capable of producing, it doesn’t seem all too outlandish. There are six positions available; the first position is a flat signal, while 2-4 provide the classic tones of premiere bassists Jaco Pastorious and James Jamerson. The fifth position provides a scoop of the midrange that brings the tone over into Stanley Clarke territory, and the final position emulates a P-bass or any other type of single pickup bass. The CertainBass is passive and requires no battery. To top it all off, the unit comes with a lifetime warranty.