The Strymon Zelzah is a multidimensional phaser pedal that combines two independent phaser circuits—a 4-stage and a 6-stage—each offering distinct modulation effects. The 4-stage side provides three sweep modes: Classic, Barber, and Envelope, delivering a range from vintage phasing to envelope-controlled effects. The 6-stage side features a Voice control that transitions from traditional phasing to flanging and chorus-like textures, enhanced by a Resonance switch with Off, Mild, and Strong settings. Zelzah supports stereo input and output, with routing options including series, parallel, and split configurations, allowing for versatile soundscapes. Additional features include MIDI integration, expression pedal support, and high-quality 24-bit/96kHz audio processing, making it a powerful tool for both live performance and studio applications. ​