Strymon's description of the Strymon Zelzah multidimensional phaser
Way Back Machine.
Step on Zelzah, play one chord, and you’re instantly taken back to a world of classic phaser tones as they were always meant to sound, perfectly voiced, with tons of vibe. Vintage 4-stage and 6-stage phasing with controls that allow seamless transitions to vibrato, gorgeous flanging and chorus, and new sounds never heard before—all instantly musical with great tone all the way across every dial.
Two Effects At Once.
Zelzah is actually two different phasers, side by side in one pedal. Zelzah’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.
Choose Your 4-Stage Phaser Sweep
The first Sweep mode is labeled “Classic” because this is the classic four stage phaser sweep we all know. In this Sweep mode, a single LFO with a warped triangle shape creates that familiar vintage sound.
Similar to the visual effect of a barber pole, the Barber sweep is a continuously rising or falling effect that is traditionally done with frequency shifters. In Zelzah we have used an arrangement of synchronized four stage phasers to produce the effect while maintaining the four stage sound.
Set the Sweep switch to Env and you’ve got a whole new pedal under your feet. Now the phaser responds to your picking like an envelope filter/auto-wah would, with the phaser sweep being dynamically controlled by your input signal, creating harmonically complex and very funky sounds.
Six Stage Voice: Groundbreaking New Phaser Algorithm
The Voice knob on the six stage side simultaneously controls over 30 different parameters, all working in harmony for an inspiring musical experience.
Not only do you get thick, juicy, phasing with pure vintage vibe, but as you turn the Voice knob clockwise, our groundbreaking new modified all-pass structure expands the time response of the cascading all-pass filters seamlessly and continuously, adding spaciousness and airiness to the sound.
Explore a range of fresh musical tones that are not a mix of phasing and flanging, but actually something entirely new. Turn the Voice knob to the right for luxurious true flanger effects, and continue to the far end of the range for lush vintage chorus sounds. There are inspiring musical sounds at every point along the dial, and so many ways to make a sound that is truly yours.
Vintage Phasing, Even Better Than You Remember.
Our goal was to capture the rich phasing sounds that were introduced in the 1970s that work so beautifully with electric guitar and electric piano.
In addition to providing the best possible version of the vintage phaser sounds we grew up with, we also wanted to expand the sonic possibilities in a way that was unique and unexpected for a phaser.
To do that, we developed an architecture that contains a modified all-pass filter as the basis for the 6-stage phaser.
A phaser is a filtering effect made up of cascading all-pass filters. There are no delay lines. But with our modified all-pass structure, we are able to expand the time response of the all-pass seamlessly and continuously.
On the four stage side, we wanted to provide the classic sounds you expect from a premium four stage phaser, while adding barber sweep and envelope controlled sweep, and a Depth control that is tuned to deliver great phasing sounds even at very shallow settings.
Mix And match.
The four stage Mix control can be used to dial in a surprisingly wide variety of sounds. With Sweep set to Classic, the Mix control gives you a range from subtle phasing to full-on classic phasing sounds, and then onward to some quite pleasing phase vibrato effects.
With Sweep set to Barber, higher Mix settings with lower Depth settings can get into harmonic tremolo territory.
When Sweep is set to Envelope, higher Mix settings result in attack induced pitch modulation.
The 4-Stage Depth control is designed to respond musically and intuitively across its full range, and varies in its effect depending on which Sweep mode is selected.
In both Classic and Barber modes, behind the scenes as you turn the Depth knob, the center frequency of the Sweep is internally adjusted to keep the frequency range in the sweet spot, producing a wide palette of beautifully voiced sounds across the entire range of the control. Additionally in Barber mode, feedback is added for increased intensity as the Depth is turned up.
With Sweep set to Envelope, the Depth knob sets input sensitivity, while the Speed knob sets the sweep range. Experiment with those two controls for a wide variety of envelope phaser tones including some very vocal-sounding timbres.
Tuned To Perfection.