Eventide H910 Harmonizer plug-in: features and spec-based rating

Eventide’s H910 Harmonizer is a pitch-shifting, delay and modulation plug-in that recreates the Eventide H910 Harmonizer, known for digital pitch shifting. You can make harmonies that follow a scale, and doubling with H910 Dual, which runs two units side by side.

A harmony and doubling plug-in makes harmonies from a single vocal, or gives it the thickness of several people singing.

In this article we compare H910 Harmonizer with 10 harmony and doubling plug-ins and rate how well it serves its purpose on three criteria. The basis is official manufacturer information.

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Summary

Among the 10 harmony and doubling plug-ins, H910 Harmonizer is rank B. The ranks run S, A, B and C, and B is third from the top. Averaging the scores for the three criteria (out of 5) gives 3.0.

Who it suits: people who want to try harmonies and detuning with the sound of vintage gear.

Main features of H910 Harmonizer

Harmonies that follow a scale

The manufacturer explains that you can change pitch by musical interval (diatonic) to make harmonies for vocals and instruments. You can also change pitch in real time using MIDI.

Doubling with H910 Dual

It comes with H910 Dual, which runs two H910s in parallel. The manufacturer explains that shifting the pitch in opposite directions can make an instrument thicker and fuller.

Delay and feedback

You can delay the pitch-shifted sound and make everything from slapback to unusual effects using feedback. You can also make it self-oscillate to create sound-effect-like sounds.

The glitches of the real unit, too

As an option, it recreates the “glitches” (rough joins in the sound) that the real H910 makes when it changes pitch.

Video: “H910 Harmonizer® Plug-in Preset Demo” (official Eventide Audio YouTube channel; narration in English) Watch on YouTube

Where it is useful

• Adding a short delay and detune to a vocal to thicken it
• Making a simple key-matched harmony
• Spreading a guitar or synth left and right with H910 Dual

Rating by criterion

Range of effects: 3 / 5

We check how many of harmonies, same-pitch voice layering (doubling), choir and stereo width it can make.

You can change pitch along a scale to make harmonies, and H910 Dual can make doubling with two units side by side.

Speed: 3 / 5

We check whether you can get an effect quickly, for example by choosing or automatic creation.

H910 and H910 Dual have several hundred presets. You set the pitches by hand.

Per-voice adjustment: 3 / 5

We check whether you can make the created voices sound natural (for example by shifting the timing or tone of each voice).

You can adjust the wobble of the whole effect with the output of the delay, Anti-Feedback, which wobbles the pitch, an envelope follower and more.

How we score (Harmony and doubling plug-ins)

Criterion	Basis	5 pt	4 pt	3 pt	2 pt	1 pt
Range of effects	Which of harmonies, same-pitch voice layering (doubling or choir) and stereo width are officially described	All three	—	Two of the three	One of the three	—
Speed	How quickly you can get an effect (automatic creation, just choosing, presets)	Parts can be created automatically (harmonies that follow the key or chord, or doubling from the original voice)	The effect is decided just by choosing the number or type of voices	Choose from presets	Detailed settings are needed	—
Per-voice adjustment	Features that make the created voices sound natural	Tone, vibrato, pan and more can be changed for each voice	Variation between voices, or per-voice volume and pan, can be adjusted	The tone and wobble of the whole effect can be adjusted	Volume and pan only	—

Each criterion is scored from 1 to 5 on how well the product serves one goal: adding harmonies, thickness and width to a vocal. Scores follow the conditions in the table above. So that products that make harmonies and products that double (layer the same pitch) can be compared by the same standard, there are three criteria: "Range of effects", "Speed" and "Per-voice adjustment". The basis is official manufacturer information. The naturalness of the sound has not been compared by ear, so it is not part of the score. Price is not part of the score. Features that cannot be confirmed from the manufacturer's or a retailer's description are scored as if absent. The "OBS (streaming)" column in the table shows whether the official page lists the VST2 format that the streaming software OBS Studio can use (○). OBS does not support the VST3 format. It is not part of the score.

H910 Harmonizer system requirements and getting started

Operating system	Windows 10 or later (x64) / Mac (macOS 10.14 or later, Intel and Apple silicon)
Plug-in formats	VST2, VST3, AU, AAX (64-bit). An iLok account is required (no physical key needed)
Trial	14-day trial available
OBS (streaming)	Works as it is (VST2 is listed)

Checked on the manufacturer’s official pages on October 17, 2026.

Compared with other harmony and doubling plug-ins

Click a heading to sort. On a phone, the table scrolls sideways.

Read next

• Quadravox: features and rating (rank B)
• MicroPitch: features and rating (rank B)
• Harmony Engine: features and rating (rank S)
• Choir: features and rating (rank A)