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Blast your tone over the edge and back. The Treble control can take your tone from cutting attack at one extreme to smooth and liquidy at the other, while the Bass control adds low-end girth at higher settings and a warm round smoothness at lower settings.
The OTTB even comes with a Cut control to add or remove higher frequencies at the turn of a knob. Vary the overall gain of the pedal from bluesy and mellow to fat and saturated. Or use the Standard/Custom switch to either make the EQ very interactive in Standard mode, or have it behave more like a traditional AC30 Hand Wired in Custom mode. You can use the Vox OTTB as a booster pedal to drive the input of your amp by setting the Gain low and the Volume high. Conversely, set the Gain high and the Volume low for an overdrive from the pedal itself. Normally, tubes are used at high voltages and this restricts their use in battery-powered devices such as guitar effects pedals.
Historically, attempts have been made to use tubes at low voltages in what has been dubbed starvation mode, but these circuits don't allow the tube to function in an acceptable manner. The COOLTRON circuit basically operates by using two very special signal paths. The first is the servo circuit, which provides the right conditions between the plate of the tube and the grid. This achieves controllable, stable parameters for the tube and provides the correct operating conditions for the tube to function as it would if it ran at a higher voltage.
The second circuit is a patented power supply that provides a low voltage, low current supply to the heater elements in the tube. Since the tube is now running at such a reduced supply level, the anode current is much smaller than normal. This means that the amount of heat required at the cathode to achieve sufficient cathode current emission is much smaller hence the ability to run the heaters at a lower level and for COOLTRON guitar pedals to run for 16 hours on 4 x AA batteries!