The Electro-Harmonix Small Stone phase shifter pedal features a single knob for Rate and a Colour switch for stronger phasing. The Electro-Harmonix Nano Small Stone phase shifter is identical to the Electro-Harmonix Small Stone, only smaller, generating the Electro-Harmonix traditional thick, sweeping phase shifting with liquid transparency and tingling feedback control.
Powered by an internal 9-volt battery or external DC adapter, the Electro-Harmonix Nano Small Stone switches between a full and robust phase shift when the COLOUR switch is DOWN to a more pronounced phase shift with in the UP position with the Nano Stone carving into the frequency spectrum hollowing out the sound.
The RATE control adjusts the speed of the phasing sweep, clockwise rotation for a faster rate. COLOR switch up carves into the frequency spectrum, hollowing out the sound. Fundamentals and harmonics glide in and out for an extremely pronounced shifting effect. Return the COLOR switch to the down position and the fullness returns. In the non-color position, with the sweep speed at minimum, the effect is not as strong and if the slowest sweep is desired the COLOR switch should be in the up position.
Phase shifting works by taking the input signal and delaying it, and then mixing the delayed signal back with the original non-delayed signal so that certain frequencies of the audio are in or out of phase with each other. The time delay is modulated via the Rate control knob so the delay changes with time. As the delay changes, different frequencies of the audio waveform will move in and out of phase with each other in the mix of delayed and non-delayed signal. This creates the characteristic sweeping sound of phaser effects pedals.