H949 Harmonizer® | Pitch, delay, and modulation plugin | Eventide
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H949 Harmonizer®

De-Glitched Pitch Shifting with Flange, Reverse & Random

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H949 Harmonizer®

De-Glitched Pitch Shifting with Unique Flange, Reverse & Random

Get Free 30-Day Demo
Instant Download

The World’s First Time Machine

Building on the legacy of the H910 Harmonizer, the H949 was Eventide’s first de-glitched pitch shifter. Produced from 1979–1984, it introduced MicroPitch which used a proprietary single sideband modulation technique for precise control of small pitch shifts. The H949 also offered unique flange, reverse, and randomized pitch effects.

Here’s how it was described when first introduced:

“…a combination digital delay line, pitch changer, and all-around special effects unit. The TIME REVERSAL feature is entirely new. When used as a variable-speed tape recorder, the Harmonizer® is capable of shortening or lengthening a piece of program material to fit a given time slot without altering the pitch.”

Popularized by Jimmy Page (as the only piece of digital gear to grace his rig) and cherished by Suzanne Ciani, the H949’s full feature set is recreated in this plug-in. From basic engineering and sound sculpting tasks to demonic space robot creations, the H949 is built to inspire.


  • Multi-effects Harmonizer with de-glitching
  • Randomized and reversed delays
  • MicroPitch for small pitch intervals
  • Reverse pitch shift
  • Combination digital delay, pitch changer, and all-around special effects unit
  • Includes H949 Dual for stereo widening, doubling, and reverse link pitch alteration

Multiple Uses

Create perfect harmonies, custom musical intervals, or outlandish effects. Fatten snares, de-tune synths, spread guitars, and create lush vocals that glue your mix. Spice up your guitar solos with delayed reverse sweeps, morph a solo vocalist into a group of backup singers or send synths down flanged-out dub-holes to another sonic dimension.

De-glitched Pitch Change

The H949 algorithm uses a proprietary auto-correlation algorithm to make intelligent splicing decisions. The user can “dumb down” the algorithm by choosing a simple cross-fade algorithm which results in characteristic glitching.

Twist the Knobs

“Old-school” UI — just twist some knobs to dial in the sound you’re going for.

Double Down

This native plug-in version also includes the H949 Dual, which recreates the popular technique of running two units in parallel. Lush doubling, stereo widening, and simultaneous shifting of pitch up and down.


Hard to beat.

This plug-in is hard to beat for authentic old-school double-tracking effects. The controls provided are unique… The signal flow and the way the various stages interact are extremely creative, flexible, and versatile.

Eli Krantzberg
Pro Tools Expert

Artists Using H949 Harmonizer®

Laurie Anderson
Roy Hendrickson
Joe Berger
Jon Hammond Band, BCTD, Cymbalic Encounters
Ken Sluiter
Heart, Weezer, Ok Go, Morrissey
Stewart Cararas
Billy Ray Cyrus, Joe Perry, Simple Plan

Want More?

Interested in more H949 history? Check out our Flashback blogs

System Requirements

We recommend you download a 30-day demo to check before buying.
Windows 8+
AAX 64-bit, VST2 64-bit, VST3 64-bit
macOS 10.9+, Intel and Apple Silicon
AAX 64-bit, AU 64-bit, VST2 64-bit, VST3 64-bit
iLok Account Required
No physical dongle necessary


Our plug-ins should work with any compatible DAW. We test against the following:
Pro Tools
Logic Pro
FL Studio
Buy Now For $199