One Pedal to Rule them All

A complete pedalboard in one stompbox, the H9 Max Harmonizer® effects pedal is full of Eventide’s iconic reverb, chorus, delay, modulation, pitch-shifting and distortion effects. With the H9 Max, you can evoke the sonic landscape of legendary albums and open the doors to the creation of new sounds never heard before. Faithfully recreate the iconic sounds used by top artists, engineers and producers such as Steve Vai, Jimmy Page, Frank Zappa, Eddie Van Halen, Richard Devine, Suzanne Ciani and many more.

The award-winning design of the H9 Max features a simple, one-knob user interface which allows easy effect editing and preset selection. Two onboard footswitches let you change presets, tap tempo, and bypass with your feet during live performance. The H9 Max offers studio quality sound, stereo I/O and full MIDI compatibility. With the free H9 Control app, you can purchase algorithms, create set lists, edit and manage presets wirelessly via Bluetooth or USB. The app is available for iOS, Android, Mac and PC.

  • Eventide H9 Max Multi Effects Pedal delay reverb modulation pitch shift distortion


The H9 Max can run all of the effect algorithms from our TimeFactor (delay), ModFactor (modulation), PitchFactor (pitch shifting), and Space (reverb) pedals as well as some created just for the H9.

  • True analog bypass
  • Real-time MIDI control
  • Power supply included
  • MIDI via DIN and USB
  • Fast accurate tuner included
  • Expression pedal and AUX footswitch input
  • Sync to the beat with tap tempo or MIDI


H9 Control

The H9 Control app provides remote control access of all Eventide effects pedals. With H9 Control, you can manage parameters, presets and settings with an easy to use interface. Get instant access to over 500 presets that push the boundaries of delay, reverb, pitch-shifting, modulation, distortion and more. H9 Control is available on Android, iOS, Mac and PC.  

H9 Control App for Android iOS Mac and PC

52 Effects Algorithms

There are 52 effect algorithms, and more than 500 presets available for H9 that include reverbs, delays, pitch shifting, chorus, distortion and everything in between.

H9 Exclusive Effects

Harmadillo - Univibe Harmonic Tremolo

Harmadillo is a harmonic tremolo offering a wide variety of LFO shapes, from traditional sine, triangle, and pulse shapes to newer shapes like ramp, lump, rump, and a continuously variable decaying slope.

  HotSawz Synth H9 Algorithm

HotSawz is a pitch-tracking, monophonic synth engine featuring six stackable sawtooth oscillators, three modulation sources, and four assignable destinations.

  Crushstation Overdrive / Distortion H9 Algorithm

CrushStation is a multi-band distortion algorithm that carves the audio signal into high and low frequency bands and then allows different levels of gain and filtering for each. 


Sculpt Distortion Algorithm

PitchFuzz is a multi-effect algorithm that combines fuzz, three pitch shifters and two delays for an amazing range of tonal shapes. It’s the equivalent of 3 high-quality effects pedals in a single stompbox. 

  Spacetime Algorithm

SpaceTime is a multi-effects algorithm combining Modulation, two Delays, and Reverb into one, easy to use effect. Unique to SpaceTime is the ability to route the Delays and Reverb in series or parallel after modulation.

  Sculpt Distortion Algorithm

Sculpt is a multi-band distortion algorithm that carves the audio signal into high and low frequency bands and then allows different levels of gain and filtering for each. 


H9 Standard & H9 Core Announcement

Please note that Eventide will no longer produces the standard H9 and H9 Core as of April 1, 2021. We will, however, offer a special Max Out Upgrade promotion for H9 and H9 Core owners indefinitely for the foreseeable future. Visit the H9 Max Out Upgrade Page to verify your discounted upgrade price. Any purchased algorithms will count toward the upgrade. Learn More

Artists Using H9 Max

Annie Clark
St. Vincent
Brad Whitford
Aerosmith, Whitford St. Holmes
Carl Broemel
My Morning Jacket
Chris Traynor
Bush, Blur, High Desert Fires
Dave Weiner
Steve Vai
Doug Wimbish
Living Colour
Dweezil Zappa
Dweezil Zappa Plays Frank Zappa
J.C. Losada
Carlos Santana, Jon Secada, Shakira, Ricky Martin
James "Munky" Shaffer
Jean Luc Ponty
Jon Anderson, Allan Holdsworth, Bela Fleck
Joel Hamilton
Tom Waits, The Black Keys
Laurie Spiegel
Mark Mangini
Mad Max Fury Road, Raiders of the Lost Ark
Nick Hexum
311, Nick Hexum Quintet
Nick Hook
Peter Frampton

H9 Max Awards


If inspiration strikes you, the remarkable versatility and processing power of the H9 can turn your dream into reality. It really is amazing what this little box can do.
Michael Pierce
The Eventide H9 Max is a guitarist's secret weapon. For a session player or hired gun, it means you’ll never have to make do without your desired tones and troubleshoot alternatives on the fly again.
Cassi Blum
She Shreds
I was surprised to see how many of the algorithms actually behave as multi-effect pedals ...the H9 equals one multi-effect, three to four standalone pedals, and a lot of less tap dancing between songs.
Philip Dodge
Distortion LTD
...wonderfully integrated effects that replace an entire pedalboard of individual stompboxes. PitchFuzz is a no-brainer for H9 owners, and a great reason to consider getting an H9 for your rig.
Mike Metlay
Recording Magazine
The reverb, delay, modulation, pitch shifting, and compression sounds are truly studio quality, and especially impressive in stereo....everything else is superb...It didn’t take long for me to see the beauty of the software and the control it offers over the pedal. 
Russ Loeffler
Harmony Central
For both gigging and studio guitarists, the H9 Max might be the only effects pedal you'll ever need. No more hauling around a bag or pedal board of effects and spaghetti mess of cords.
Dave Celentano
Guitar Tricks
Of all the new H9-specific algorithms, this SpaceTime is by far and away my favorite to date.  SpaceTime is essentially a little pedalboard of time-based effects crammed into one algorithm.
Fletcher Stewart
Tone Report
"CrushStation will take you from the depths of molten metal to smooth creamy slightly overdriven tube tones...applications for the H9 Max are unlimited. Being able to ditch my entire pedal board for a single stomp is amazing."
Bruce G Owens Jr
"With all of these new algorithms and more on the way, the H9 becomes a better and better value every day. With the H9 Max, your initial investment pays more and more dividends over time...
Mike Metlay, Paul Vnuk Jr., and Alex Hawley
Recording Magazine
Occasionally, a product comes along that can be referred to as ‘game changer’.
Rich Tozzoli
Ask Audio
[The H9] allows you to have almost any effect sound you can think of in the palm of your hand, accessibly easily and with incredible sonic clarity and tone.
Pedal of the Day
About the only thing the H9 max can’t do is cook dinner, but that’s okay, as you’ll be having so much fun exploring its effects that you’ll forget to eat.
David Bryce
All of the 45 algorithms sound stunning with ‘best in class’ sound quality and a pretty much unlimited range of creative options for sculpting unique sounds.
Tom Quayle
Guitar Interactive magazine
The fully loaded H9 Max is by far the best bargain in professional- and studio-quality effects ever offered by a stomp box-format effect unit, providing literally hundreds of effects with superb sound. Read more...
Chris Gill
Guitar World
Exploring things like Reverse delay, Pitch Undulator, Resonator, and the cool Looper, I realized there were many algorithms I might never have considered without the opportunity to spend some serious time with them.
Michael Ross
Guitar Moderne
One of the most ambitious and brilliantly executed musical instruments ever released. The H9 is more than a simple effects unit and will become an invaluable creative companion for guitarists, performers, producers, DJ’s, and anyone else who makes music… period.
Gabriel Tanaka
Best Guitar Effects
The latest addition to Eventide's stompbox range has the chameleon-like ability to emulate all of its siblings! The sound quality is impeccable... and the amount of care and thought that must have gone into developing the control app is impressive.
Paul White
Sound on Sound
If Hendrix were alive today, he’d toss his Fuzz Face and Octavia out the window and dive into this hip technology headfirst. Think of it as having Eddie Kramer right on your pedalboard.
Pete Brown
Vintage Guitar delivers superior delay, pitch, modulation and reverb sounds in a small package....Plugging in anything—my Tele, Les Paul, Strat, baritone, cigar box guitar, etc... delivers pure inspiration.
Pro Audio Review
The Eventide H9 produces glorious sounds that, until recently, required bulky processors costing thousands of dollars...You could twiddle its knobs for years and still find groundbreaking discoveries to take your music to the next dimension.
Joe Charupakorn
Premier Guitar

Customer Testimonials

I can honestly say that this pedal has actually caused me to be more enthusiastic about picking up my guitar and jamming and being creative with new riffs. This is the only guitar effects pedal that is ever done that for me.
The upgradeable part of the H9 is a big part of its appeal. But so is the absolutely awesome software functionality, which no other pedal or manufacturer can match these days.  
—Scott McGrath
You did it again. Amazing how you can put more than 40 years of exquisite audio technology into a single stompbox...Now you have the world best effect processor in the palm of your hand.
—Arnd Hendrickx

Get Started with H9

Adrienne Humblet provides instruction on getting up and running with the Eventide H9 Harmonizer stompbox.



Input 1 (mono) ¼ inch mono phone jack
Input 2 ¼ inch mono phone jack
Output 1 (mono) ¼ inch mono phone jack
Output 2 ¼ inch mono phone jack
Expression Pedal ¼ inch mono phone jack
Mini USB Use 2.0 cables only
MIDI In Five pin DIN (Female)
MIDI Out/Thru Five pin DIN (Female)
AC Adapter Jack Power supply included (see below)

Analog I/O

Input Impedance 600K ohms (mono or stereo)
Output Impedance 470 ohms
Recommended Load Impedance 10K ohms or greater


Power 9VDC, 500mA, center pin(+)
Dimensons English: 5.25" (H) x 4.65" (W) x 1.96" (D)
Metric: 133 (H) x 118 (W) x 50 (D) mm
Weight 1.53lbs, 0.7kg / Retail box 3 lbs, 1.36 kg
Scroll to top