Check the listing for details. Warm Audio Mutation Phasor II Effects Pedal Metal. Condition: New. Listed at 149.00 USD. The Warm Audio Mutation Phasor II effects pedal accurately recreates the deep phase-shifting psychedelic modulation of the original phaser made famous in studios during the 1970s. Add depth, wobble, swirl, or “instant funk” to guitar, keys, bass, or anything you can dream of. For ultra-rich swirly phase-shifting, the “Depth” control allows you to vary the width of the sweep range—delivering deep modulation expected from a vintage all-analog pedal. Increasing the depth control adds width to the frequency range of the effect, impacting higher highs and lower lows. Easily change the speed (or rate) of the phase-shifting effect to create more or less “wobble” in your tone—from 1/10th sweeps per second (slowest) to 18 sweeps per second (fastest).