Two Effects At Once.Zelzah is actually two different phasers side by side in one pedal. Zelzahâ??s 4-stage side gives you a wide array of classic tones ranging from phasing to vibrato and more while the 6-stage side provides phasing flanging chorus and all points in between. Dial in a chorus on one side and barber pole phaser on other or a phaser on one side and tremolo on the other. Use the two sides independently or together in a variety of configurations. Zelzah may become the only modulation pedal you keep on your board. Please note that the power supply is not included and can be purchased separately.