Eventide H90 Harmonizer Multi-Effects Pedal, Dual Algorithm, 66 FX

Eventide H90 Harmonizer: The Flagship Dual-Effect Pedal

The Eventide H90 Harmonizer is a flagship stereo multi-effects pedal that runs 66 algorithms, including 14 all-new effects, through a dual-algorithm architecture that plays two at once. It is the most powerful stompbox Eventide has built, combining the entire H9 Max library with a new generation of algorithms and a routing engine deep enough to replace much of a pedalboard. Two effects running simultaneously per Program means a player can pair a pitch shifter with a reverb, or a distortion with a delay, and shape how they interact. For the guitarist or producer who wants studio-grade effects and serious routing in one box, the H90 is the top of the range.

Dual-Algorithm Architecture

The defining capability of the H90 is that each Program runs two complete algorithms at the same time rather than a single effect. Those two algorithms can be chained in series so one feeds the other, split into parallel paths, or configured with independent routing, so combinations that once required two separate pedals happen inside one unit with full control over their order and blend. This is a genuine architectural step beyond the single-algorithm H9, and it changes what a player can build, from a harmonizer into a reverb to a compressor into a modulated delay. The pedal manages the signal flow between the two effects internally, keeping the routing musical and coherent. Running two effects at once is the feature that makes the H90 feel less like a pedal and more like a compact processor.

66 Algorithms, 14 All-New

The H90 carries all 52 algorithms from the H9 Max and adds 14 that are new to the platform, including Polyphony, PolyFlex, PolySynth, Prism Shift, and SP2016 Reverb. The new algorithms lean heavily into polyphonic pitch and synthesis, letting the pedal harmonize full chords, generate synth voices from an instrument, and produce shimmering pitched textures with a realism earlier hardware could not manage. SP2016 Reverb brings a version of Eventide's classic studio reverb into the pedal, prized for its natural, musical decay. Combined with the inherited H9 library, this gives the H90 the deepest and most current algorithm set in any Eventide stompbox. It is a toolbox that spans everyday sounds and effects available nowhere else.

SIFT Polyphonic Pitch Shifting

Several of the H90's standout effects rely on SIFT, Spectral Instantaneous Frequency Tracking, Eventide's low-latency polyphonic pitch-detection technology. SIFT analyzes the incoming signal's frequency content in real time to track multiple notes at once, so the pedal can pitch-shift and harmonize full chords rather than being limited to single notes like most trackers. Doing this with low latency means the shifted or harmonized voices arrive tightly with the original, keeping playing feel natural rather than laggy. This is genuinely difficult processing, and it is what allows the polyphonic algorithms to sound musical instead of glitchy. For players who harmonize chords or build synth-like textures from a guitar, SIFT is the engine that makes it convincing.

Flexible 4-In, 4-Out Routing

The H90 offers four 1/4-inch inputs and four 1/4-inch outputs, giving it the connectivity to sit at the center of a complex rig rather than in a single loop. This lets a player run stereo in and out, insert the two algorithms at different points in a signal chain, or handle two instruments and multiple amps at once. Expression and control inputs on TRS jacks add real-time foot control over parameters, while the routing works hand in hand with the dual-algorithm engine to place each effect exactly where it belongs. Such flexible I/O is what turns the H90 into a routing hub, not just an effects box. It rewards a thoughtful rig with configurations no simpler pedal can achieve.

OLED Display and Hands-On Control

The H90 presents a high-resolution OLED display alongside five push knobs, seven LED buttons, and three footswitches for immediate, detailed control. The bright OLED shows both algorithms, their parameters, and routing clearly enough to edit on a dark stage without an app, while the push knobs give direct access to the sounds a player adjusts most. Three footswitches allow preset stepping, bypass, and performance functions to be handled entirely by foot during a set. This depth of on-pedal control means the H90's power is usable in the moment, not locked behind a screen. It is a professional interface built for a pedal this capable.

App Integration and Connectivity

Connectivity on the H90 spans USB-C and full 5-pin MIDI In and Out/Thru, tying the pedal to a computer and a wider rig. USB-C links to the Eventide Control app for deep editing, preset organization, and firmware updates that keep the pedal current as new features arrive. Full MIDI lets the H90 sync tempo, recall presets remotely, and integrate into a programmed pedalboard or studio environment. Together these make the pedal as manageable as it is powerful, whether a player edits by hand or from software. That balance of onboard control and deep external editing is central to living with an instrument this deep.

Who the H90 Is For

The H90 is for serious guitarists, bassists, and producers who want the deepest Eventide effects and the routing to use them, in a single flagship pedal. Its dual-algorithm engine, 66 algorithms, SIFT pitch shifting, and 4-in/4-out routing suit complex parallel and series signal chains, studio-grade pitch, reverb and modulation, and ambient and experimental sound design. The pedal rewards players willing to explore its depth, offering a learning curve that pays off in sounds and configurations nothing simpler can match. For anyone building a rig around one powerful centerpiece, the H90 is Eventide's most capable stompbox.