Built to serve as the centerpiece of a modern pedalboard, the Eventide H90 Harmonizer is a flagship multi-effects pedal that combines studio-grade processing with performance-ready control. At its core are 74 professional algorithms spanning reverb, delay, modulation, pitch shifting and advanced sound design, giving players access to the signature Eventide effects heard on countless recordings. The H90’s dual-algorithm architecture allows two effects to run simultaneously within a single Program, enabling layered textures, complex signal chains and creative combinations that would typically require multiple pedals. Hundreds of curated factory Programs provide instant access to polished sounds, while flexible routing, MIDI integration and an intuitive front-panel interface make the pedal equally at home on stage or in the studio. Whether building expansive ambient soundscapes, crafting precision pitch harmonies or shaping detailed modulation chains, the H90—available here as a limited-edition Dark variant—delivers the flexibility and sonic depth that have defined Eventide’s Harmonizer legacy.

74 Algorithms and Dual-Effect Processing

The H90 provides an extensive collection of 74 algorithms that cover the full spectrum of professional effects processing. Classic delays, lush reverbs, modulation textures and Eventide’s renowned pitch-based effects sit alongside new processors designed for modern sound design and experimental processing. Each Program can run two algorithms simultaneously, allowing players to combine effects in series or parallel for sophisticated signal chains. This architecture makes it easy to pair harmonized pitch shifting with delay, layer modulation with ambient reverb or construct multi-stage effects that remain clear and controlled within a single pedal. Exclusive algorithms such as PolyFlex, Polyphony and Prism Shift expand the pedal’s capabilities further with advanced polyphonic pitch processing powered by Eventide’s SIFT tracking technology for fast, accurate and natural pitch response.

Vocal Harmonizer and Synth-Based Programs

Borrowing technology from Eventide’s flagship H9000 processor, the H90 also introduces the Harmonizer+ vocal algorithm suite for shaping and transforming vocals live or in the studio. Algorithms including VocalTune, VocalShift, VocalShiftMIDI and Quadravox+ provide tools for pitch correction, harmonization and MIDI-controlled vocal processing. In addition to vocal processing, the pedal’s synth-focused programs—such as PolySynth and other pitch-driven algorithms—can transform a standard instrument signal into layered electronic textures ranging from analog-style warmth to crystalline digital tones. These tools expand the H90 well beyond traditional guitar effects, opening creative possibilities for producers, sound designers and performers working across multiple instruments.

Granular Algorithms and Expansive Sound Design

Eventide continues to expand the H90 platform with four granular-based algorithms available as a free firmware update. Cosmic Web blends reverse-pitched grains with Eventide-style reverb to generate deep, evolving delay textures and spacious pad-like ambience. Glitch slices and reconstructs audio using multiple glitch engines capable of aliasing artifacts, granular burst patterns and pitch-shifted sample-rate effects. GrainMod introduces three independent LFOs that modulate grain parameters such as trigger rate, duration and filtering, allowing textures to evolve continuously rather than repeat. Completing the set, Stutter creates rhythmic burst patterns ranging from tight rolls to scattered glitch textures with probability-based triggering and footswitch control. Together these processors push the H90 Harmonizer beyond traditional multi-effects processing into a powerful environment for immersive soundscapes and experimental audio manipulation.

Perform Mode Control for Live Performance

The H90 is engineered for real-world stage use, with a dedicated Perform mode that places essential controls directly underfoot. Six programmable footswitches can be assigned to functions such as tap tempo, preset navigation, effect bypass or momentary performance actions like delay repeats, pitch flex and reverb freeze. The Perform HotKnob and Quick Knobs allow multiple parameters to be adjusted simultaneously, making it possible to reshape sounds dynamically during a performance without interrupting the flow of a song. Combined with the pedal’s high-resolution OLED display, five push-turn knobs and seven LED buttons, the interface provides immediate tactile control while still supporting deep editing.

Flexible Routing And Deep System Integration

To accommodate modern pedalboard and studio setups, the H90 offers extensive routing and connectivity options that allow effects to run in series or parallel within the signal chain. Two mono inserts—or a single stereo insert—enable external pedals or outboard processors to be placed anywhere in the signal path. Dual Mode allows the pedal to process two independent stereo instruments simultaneously or integrate seamlessly into four-cable method amplifier rigs. Instrument- or line-level operation, MIDI connectivity, expression control and USB integration further expand the pedal’s flexibility. For deeper editing and preset management, Eventide’s H90 Control software allows users to organize Programs, update firmware and design complex signal chains from a computer. With its extensive algorithm library, dual-engine processing architecture and powerful routing options, the Eventide H90 Harmonizer remains a flagship multi-effects pedal for musicians seeking studio-quality sound design and expressive real-time control.

Eventide H90 Harmonizer: FAQ

What does the Eventide H90 Harmonizer do?
The Eventide H90 Harmonizer is a professional multi-effects pedal with 74 algorithms covering reverb, delay, modulation, pitch shifting, distortion and advanced sound design. Its dual-algorithm architecture allows two effects to run simultaneously, enabling complex signal chains and layered textures from a single pedal.

Is the Eventide H90 difficult to use?
The H90 is designed for both deep editing and quick stage control. Dedicated knobs, Perform mode and an OLED display allow fast adjustments, while the H90 Control software provides detailed preset editing and organization.

Does the Eventide H90 include distortion or overdrive effects?
Yes. The H90 includes distortion and drive algorithms such as WeedWacker and Aggravate, allowing players to add saturation alongside delay, modulation or pitch effects within the same Program.

Can the Eventide H90 run two effects at the same time?
Yes. The H90’s dual-algorithm design allows two effects to run simultaneously in series or parallel within a single Program, making it possible to create layered ambient textures, harmonized delays and complex multi-stage effects.

What types of effects are included in the Eventide H90?
The H90 includes a wide range of effects including reverb, delay, modulation, pitch shifting, distortion, synth-style processing and vocal harmonizer algorithms. Many effects are derived from Eventide’s flagship H9000 processor and expanded with new capabilities.

Does the Eventide H90 support MIDI and external control?
Yes. The pedal supports MIDI in/out/thru, expression pedals and auxiliary switches for expanded control. These options allow the H90 to integrate easily with pedalboards, MIDI rigs and studio setups.

Can the Eventide H90 be used with instruments other than guitar?
Yes. The H90 supports both instrument- and line-level operation, making it suitable for guitar, bass, keyboards, synthesizers and studio processing. Its flexible routing and stereo processing also work well in complex recording or live performance setups.