Roadie Bass has more torque than any musician could ever need when tuning a geared machine head. 300:1 gearing provides ultra-precise tuning adjustments and its vibration sensing allows Roadie Bass to tune completely automatically and stand alone. Roadie Bass' advanced audio algorithms and machine precision consistently deliver perfectly accurate tuning for acoustic, electric, classical and steel guitars, 7 and 12-string guitars, ukuleles, mandolins, banjos, dulcimers, basses, and much more. Choose from over 40 preset alternate and open tunings. The Roadie Tuner app also gives you the ability to create your own custom tunings and temperaments. Re-string quickly and easily with the automatic winding feature. The motor rotates at three speeds, the fastest of which is 40 RPM.