The Electro-Harmonix OD Glove provides a rich, overtone-laden sound that doesn’t get muddy. Responsive controls that take you from sparkling, clean boost through brown crunch and to thick, saturated hi-gain. It has advanced features like Tone Shift and selectable 9 or 18V internal voltage for surgical sound sculpting. Controls The GAIN Knob controls the amount of input gain and overdrive. As you turn this knob clockwise, the OD Glove ranges from sweet cleans to full-power distortion. The TONE knob on the OD Glove filters out high frequencies. When fully clockwise, the full tonal range of the overdrive comes through. As the knob is turned counter-clockwise, high frequencies are rolled off. Use this to achieve a smoother tone or to reduce any high-frequency harshness. VOL knob sets the output level of the OD Glove. The TONE SHIFT Switch controls the mid-frequency emphasis of the TONE knob. Setting this switch to OFF creates a flatter EQ, with some emphasis on low mids. Setting the SHIFT switch to ON emphasizes mids and high mids. There is also a small increase in volume when the switch is set to ON. The Footswitch selects whether the OD Glove is engaged or in true bypass mode. When the effect is engaged, the LED is lit. The OD Glove includes an internal slide switch to change its internal power supply voltage from 9V to 18V. Operation at 18V results in a less compressed, more open tone that may work better for some guitar and amplifier combinations. Operation at 9V results in a tighter sound, and reduces the current draw to 5mA. Experiment with the voltage setting at full volume to find the best sound for your playing style. Please remember to not exceed 10VDC at the 9V Power Jack. The OD Glove generates the 18V internally.