Ernie Ball VPJR Tuner Enjoy the same rugged construction and time-tested performance as Ernie Ball's traditional volume pedal PLUS an enhanced definition digital tuner pedal. Save space and simplify your pedalboard with this unique 2-in-1 pedal for guitar or bass. In the heel down position (volume off), the display automatically enters tuner mode, offering a smooth, accurate, and visually pleasing tuning experience. As foot sweeps forward, the vibrant screen conveniently displays your volume level. Display can also be set to volume only or tuning only. Simply double tap the touchscreen to select between modes. The mono input jack can accept both passive and active mono audio signals with 9 to 18 volts of headroom (depending on the power supply), making it an ideal tuner pedal for both bass and guitar. Pedals are set to the standard 440 Hz, but reference pitches from 432 Hz to 447 Hz are readily available via the touchscreen.