One Pedal to Rule them All

Every guitar pedal you need in one pedal, the H9 Harmonizer® is full of Eventide’s iconic reverb, chorus, delay, modulation and pitch-shifting effects. The award-winning design of the H9 Harmonizer 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 offers studio quality sound, stereo I/O and full MIDI compatibility. With the free H9 Control app for PC, Mac and iOS, you can purchase additional algorithms, create set lists, edit and manage presets wirelessly via Bluetooth or USB.
  • H9-Harmonizer-Top View


The H9 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


Compare H9 Models

H9 MaxH9 MAX

Preloaded with 49 effect algorithms and 99 presets. Over 500 presets available via the H9 Control app. H9 MAX includes all future algorithm releases at no additional cost.

H9 Exclusive:

  • UltraTap Delay
  • Resonator
  • EQ Compressor
  • CrushStation
  • SpaceTime
  • Sculpt

From Space:

  • Shimmer
  • Hall
  • Blackhole
  • Spring
  • Plate
  • Room
  • MangledVerb
  • Tremoloverb
  • ModEchoVerb
  • DualVerb
  • DynaVerb
  • Reverse Reverb

From PitchFactor:

  • Crystals
  • H910/H949
  • Diatonic
  • MicroPitch
  • Quadravox
  • PitchFlex
  • Octaver
  • Harpeggiator
  • Synthonizer
  • Harmodulator

From ModFactor:

  • Chorus
  • Tremolo
  • Phaser
  • Q-Wah
  • Flanger
  • ModFilter
  • Rotary
  • TremoloPan
  • Vibrato
  • Undulator
  • RingMod

From TimeFactor:

  • Tape Echo
  • Vintage Delay
  • Digital Delay
  • Mod Delay
  • Ducked Delay
  • Band Delay
  • Filter Pong
  • MultiTap
  • Reverse
  • Looper

H9H9 Harmonizer®

Preloaded with 9 effect algorithms and 99 presets. Additional effects available for purchase via the H9 Control app.

- Every H9 Harmonizer comes with a coupon for a free algorithm download.

- Every H9 Harmonizer can be MAX'd out at any time.

Learn About MAXOut Program

H9 Exclusive:

  • UltraTap Delay

From Space:

  • Shimmer
  • Hall

From PitchFactor:

  • Crystals
  • H910/H949

From ModFactor:

  • Chorus
  • Tremolo

From TimeFactor:

  • Tape Echo
  • Vintage Delay

H9 CoreH9 CORE

Preloaded with 25 presets from the original H910 / H949 Harmonizers. Additional effects available for purchase via the H9 Control app. 

- Every H9 CORE comes with a coupon for a free algorithm download.

- Every H9 CORE can be Max'd Out at any time.

Learn About MAXOut Program

From PitchFactor

  • H910/H949







There are 49 effect algorithms available for H9 that include reverbs, delays, pitch-shifting, chorus and distortion effects. While the H9 is capable of running bread-and-butter effects like Tape Echo or Spring, there are also numerous combination effects like Mod Delay (modulation and delay) and ModEchoVerb (modulation, echo and reverb). The combinations of these effects and parameters can used to create unique and original sounds that wouldn't otherwise be possible with single effects. 

Every H9 comes preloaded with presets to give you an idea of what is possible with each unique algorithm and of course you can create your own. An example would be Bridge of Sighs — a preset created using the Digital Delay algorithm that combines a stereo delay effect with modulation.  Another example is Fra Diavolo — a preset created using the CrushStation algorithm that combines overdrive, octave shift, noise gate, compressor and sag. 

Featured Algorithms


Sculpt Distortion Algorithm

Sculpt is a multi-band distortion algorithm that gives you a degree of control that would otherwise require 3 or 4 pedals or complex plug-ins. Sculpt does this by carving the audio signal into high and low frequency bands and then allowing different levels of gain and filtering for each. This multi-band approach has been used by professionals in the studio and on stage for many years. Now it's available to anyone with an H9.

  Spacetime Algorithm

SpaceTime is a multi-effects algorithm combining Modulation, two Delays, and Reverb into one, easy to use effect. The Delays are based on Eventide’s Vintage Delay algorithm from the TimeFactor pedal and the Reverb section draws from both the Plate algorithm in the SPACE pedal, as well as Eventide’s UltraReverb plug-in. Unique to SpaceTime is the ability to route the Delays and Reverb in series or parallel after modulation.

  CrushStation Distortion Algorithm

CrushStation turns the H9 into an overdrive command center with unprecedented control of the effect with results ranging from buttery saturation to crushing assault. Control features include the usual suspects: Drive, Sustain, multi-band EQ. Plus control over unique features like Sag, Octaves and Grit that take the overdrive effect beyond the norm.


Artists Using H9

Annie Clark
St. Vincent
Brad Whitford
Aerosmith, Whitford St. Holmes
Carl Broemel
My Morning Jacket
Dave Weiner
Steve Vai
Stephen Carpenter
Vernon Reid
Living Colour
Albert Hammond Jr.
The Strokes
Andee Blacksugar
Black Sugar Transmission, Peter Murphy
Daniel Donato
Eliot Sumner
Eliot Sumner
Julie Slick
Adrian Belew Power Trio
Kaitlyn Aurelia Smith
Martha Mooke
Roy "Futureman" Wooten
The Flecktones
Samuel Hällkvist
Jazz guitarist
Teddy Kumpel
Loopestra, "Temple Grandin"
Young the Giant
Young the Giant
Danny Gomez
Brian May (Queen), Toxic Productions
Pasku Frutos
Unrisen Queen
Tyler Morris
Vince Watson
Producer, DJ (Techno, House)

H9 Awards


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.
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
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 it effect that you’ll forget to eat.
David Bryce
Tom Quayle from Guitar Interactive magazine spends some time with the H9 Max. "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
Guitar World checks out the "revolutionary" H9 Max in this review by Chris Gill.
Chris Gill
Guitar World
Michael Ross of Guitar Moderne takes another look at the H9 after he gets his hands on an H9 Max.
Michael Ross
Guitar Moderne
Gabriel Tanaka of Best Guitar Effects takes a look at the Eventide H9.
Gabriel Tanaka
Best Guitar Effects
It is like having the power of Steve Vai, Eddie VanHalen, Jimmy Page and Vernon Reid in the palm of your hand.
Bruce G Owens Jr
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
...it 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

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
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
I have had my Eventide H9 for 30 days now, and I am so impressed that I feel compelled to give some feedback. Last year, I bought an Axe FX and hated it from the second I unboxed it. It’s probably fine for guys who can hire a tech just to program a guitar processor. I spent so much time fiddling with it, there was less time to rehearse. Trying to program a computer is not making music! The... Read more
—Rick Langford

H9 Control

H9 Control is the ultimate tool for optimizing your experience with all the Eventide stompboxes.  Use it to manage preset lists, update firmware, configure an auxilliary switch, listen to demos without hardware, backup your settings and more. H9 Control not only gives you incredible control over parameters and settings, but it encourages you to explore new sonic territory. Fold, spindle and even mutilate your sound and experience what it's like to be inspired by your gear.

H9 Control runs on Windows, Mac and iOS, connects wirelessly via Bluetooth to the H9 and using a USB cable to connect to the Space, PitchFactor, TimeFactor and Modfactor stompboxes and is available for free

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

Frequently Asked Questions


No. All preset selection and editing, along with system mode changes, can be done from the H9 itself. The H9 companion app, H9 Control, works on Windows, Mac, and iOS devices and will connect either via USB or wirelessly via Bluetooth.

Yes. If you're using H9 with a distortion pedal, we recommend that you connect it after the distortion pedal. In general, it's best to place delay effects after distortion effects. That writ, use whatever sequence works best for your sound.

Yes. You can see them in the H9 Control app. From the H9 Itself, Press and hold the X, Y, or Z button. Then pressing the big knob will reveal the saved value of that parameter.

Because there is no digital I/O the sample rate is optimized for maximum audio performance for each effect and is program dependent.

The same as it is for our other products, one year parts and labor.

Power Supply

We recommend the PowerFactor 2, which can run up to four Eventide Stompboxes plus up to 4 9VDC/100mA pedals. The PowerFactor 2 carries a 5 year warranty and includes the cables required to power 4 Eventide stompboxes and the special mounting plate for PedalTrain pedalboards. 
Users may try non-recommended third party power supplies at their own risk. Resultant damage is not covered under warranty. 

9VDC, 500 mA, center pin (+)


H9 Control does not run on Android at this time. While we believe Android support is important, we are a small company with limited resources. Qualified Android developers interested in helping in this effort are encouraged to contact us. H9 Control is available for WindowsMac, and iOS.  With exception of creating set lists and purchasing algorithms, everything you can do on the app can also be done via the front panel interface of the H9 pedal. Also available is the OX9 Aux Switch, which allows you to control most H9 functions (e.g., active/bypass, preset change, tap tempo, tuner, performance switch, parameter adjustments, bank up and bank down).

Expression Pedal

Absolutely. An expression pedal is a powerful creative controller when used with our stompbox effects. An expression pedal can be programmed to control any combination of the effect parameters. If you're playing live, it's like having 12 hands, 2 for the guitar and 10 for the stompbox's control knobs. To use an expression pedal you must select "EXP" under the System Mode/Utilities/Exp Tip Menu.

Our stompboxes will work with any expression pedal that is a simple resistive load (potentiometer) with a max value of 25k Ohms. For the best performance we recommend the Ernie Ball VP Jr. 25k. Connect the output to the Eventide stompbox expression pedal input. We have also have heard from users who had success with the M-Audio MGear EX-P, Line-6 EX-1, Mission Engineering SP1-LF, Source Audio Reflex Universal Expression Controller, Roland EV-5, and Boss FV500L.

New for H9:

Mission Engineering has released an expression pedal specifically designed to work with the H9. The SP-H9 has a potentiometer wired as a rheostat and an integrated momentary switch connected to the ring. This allows the customer to connect the expression pedal to the H9 with a single TRS cable and get both expression pedal and switch functionality in the one unit. There is also a parallel switch input so customers can connect an external TS switch just using a regular 1/4” instrument cable. Learn more at: http://missionengineering.com/?product=sp-h9-eventide

If your expression pedal has a trim pot control, try adjusting it to either end of its range. If your expression pedal causes parameter values to go from min to max and back down to min again as you move from toe to heel, try connecting it using a stereo phone cable rather than a mono cable. If the calibration seems wrong, try plugging the expression pedal in before powering up the stompbox.


Yes. Bypass via MIDI works through a MIDI continuous controller message (MIDI CC.) From the MIDI menu in system mode you can select RVC CTL and you will see a list of things that can be controlled by MIDI CC. The first item in the list is BYP, or bypass.

Yes. If you connect the two or more Eventide stompboxes together via MIDI, you can use the footswitches from one pedal to change presets on the other, and you can use the knobs on one pedal to change values on the other.

The stompbox automatically detects whether a USB connector is attached. If one is, USB is selected for MIDI source and destination and any activity on the DIN connectors is ignored. If a USB cable is not attached, the DIN connectors are used to send and receive MIDI messages. So, if you want to send or receive MIDI using the DIN connectors, unplug the USB cable.

Yes. MIDI Clock Receive and/or Transmit can be activated in the MIDI sub menu of system mode.

You can program MIDI to load presets, change parameter values, set tempo, bypass and more. MIDI programming is done in system mode. The unit can transmit MIDI program change via the footswitches, and MIDI continuous controller via the ten knobs.

Aux Switches

Yes. By using a stereo 1/4 inch y-cable, you can connect one aux switch to two Eventide stompboxes.

Yes. A single, mono aux switch will only work with the "T+R" (tip and ring) setting.

We've successfully used the DigiTech FS300.

You can connect up to three aux switches and use them to control things like preset loading, HotSwitch, and tap tempo.  To use an Aux switch you must select "switch" under the System Mode/Utilities/Exp Tip menu.

You may have to go through the aux switch assignments and make sure the switch is not assigned to multiple things.


A few things. First, the USB interface is MIDI class compliant for use with your computer sequencer or DAW. The USB interface can also be used to dump your presets and load new presets. Finally, the USB interface is used to load software upgrades as they become available. 


Yes. Presets can be stored to and retrieved via the H9 Control app.

To restore factory presets and all system settings, power up while simultaneously pressing the HotKnob button and the Tap footswitch until [INITIALIZING] scrolls across the billboard display. CAUTION: This function will overwrite any presets that you've saved. If you want to be able to restore one or more of your presets you must first save them to a computer.

Yes, but you can restore the factory presets at any time.

Audio I/O

When in relay bypass, the input signal is hardwired to the output signal through relays so that the signal is unprocessed and does not go through the converters. There is an alternate setting for DSP bypass whereby the signal goes through the A/D and D/A.

After extensive testing with an analog dry path vs. converting the signal and doing the wet/dry mix after the converter, we chose the latter due to the fact that it ultimately sounds better. By changing the wet/dry mix after the conversion we avoid comb filtering resulting from phase cancellation which occurs when mixing together a dry analog signal with a signal which has gone through A/D and D/A. This comb filtering effect can seriously degrade your tone depending on the frequency. We use very high quality A/D converters which are very transparent and do not affect your tone (we have been making effects processors used by guitar players for over 40 years and have a proven track record in this area). However, if you so desire, you can use a switcher or a analog pan pedal and run a completely dry analog signal path outside the Stompbox and run H9 at 100% wet. In fact, we have added a "Kill Dry" setting in the system menu if you are running your set up that way.

When used with some low impedance tube amps it may sound like H9 is adding brightness when Active because it is acting as a buffer. This is really letting you hear the highs that were lost from your signal without a buffer. Many amps have buffered effects loops to address this issue. In this case we recommend that you connect our Stompboxes through the effects loop of these amps. If your amp does not have an effects loop, or if you prefer to run our Stompboxes in front of the amp (after the guitar before the amp’s input,) a solution would be to always have a buffer pedal in the signal chain before H9 (if using relay Bypass) or simply always use DSP Bypass mode.

H9 Control App

You cannot connect multiple iOS devices to a single H9 at the same time. Once an iOS device is paired with an H9, another iOS device will be unable to pair to the H9.

One iOS device can connect to at most three H9's at a time. If you connect to a fourth device, your iOS device will drop the oldest connection so there are still only three connections. You cannot, however, connect to one H9 from multiple iOS devices at the same time. Once an iOS device is paired with an H9, another iOS device will be unable to pair to the H9.

Here are a few of the iPad clips we have used at Eventide and had good experiences with:

  • Talent iClaw Mic or Music Stand Holder for Apple iPad
  • IK Multimedia iKlip for iPad
  • Sonic Clamp (for iPhone 4S)

  • Castiv's Guitar Sidekick

H9 Control is not currently available on Android. We have been looking into adding Android support but are not currently actively working on an Android port.

Yes, the H9 Control app works with all our stompboxes via USB on a MAC or PC. To update TimeFactor, ModFactor, PitchFactor, or Space simply update to the latest software version.

H9 Control works on the following iOS devices that are capable of running iOS 6 or greater and support Bluetooth communication: iPhone 4 or higher and iPad 2 or higher.
H9 Control also works on Mac OS X 10.6 or greater or Windows XP or greater via USB or Bluetooth.

H9 Control App, Bluetooth

The 4 digit PIN for Bluetooth pairing is the same as the last 4 digits of your H9's serial number. There are several ways to find the serial number:

  1. The serial number is printed on a sticker on the bottom of the H9.
  2. If you have registered your H9, the serial number will also appear on the My Products tab of your account page (login required).
  3. Find the serial number by using the H9's System Mode, as follows
    1. Power on the H9
    2. Press and hold the HOTKNOB button and Right Footswitch simultaneously for a few seconds to enter System Mode (The Left and Right Footswitch LEDs will flash RED continuously to remind you that you’re in this special mode)
    3. Turn the HOTKNOB until you see UTILS
    4. Press the HOTKNOB
    5. Turn the HOTKNOB until you see SER#
    6. Press the HOTKNOB
    7. Your serial number will scroll by. It starts with "H9-"
    8. Your PIN is the last four digits
    9. Press and hold the HOTKNOB button and Right Footswitch simultaneously for a few seconds to exit System Mode.

The 4 digit PIN for Bluetooth pairing is the same as the last 4 digits of your H9's serial number. There are several ways to find the serial number:

  1. The serial number is printed on a sticker on the bottom of the H9.
  2. If you have registered your H9, the serial number will also appear on the My Products tab of your account page (login required).
  3. Find the serial number by using the H9's System Mode, as follows
    1. Power on the H9
    2. Press and hold the HOTKNOB button and Right Footswitch simultaneously for a few seconds to enter System Mode (The Left and Right Footswitch LEDs will flash RED continuously to remind you that you’re in this special mode)
    3. Turn the HOTKNOB until you see UTILS
    4. Press the HOTKNOB
    5. Turn the HOTKNOB until you see SER#
    6. Press the HOTKNOB
    7. Your serial number will scroll by. It starts with "H9-"
    8. Your PIN is the last four digits
    9. Press and hold the HOTKNOB button and Right Footswitch simultaneously for a few seconds to exit System Mode.

Buying Algorithms

Yes. You can purchase algorithms from the Mac or Windows desktop version of H9 Control using PayPal.

No. We are not currently offering algorithms at discounted prices to existing Factor stompbox owners.

The price of algorithms varies, but most are $19.99.

If you buy an algorithm for an H9 or use the coupon that comes with the H9 to buy an algorithm, it is unlocked on all the H9 stompboxes that are registered to your account. You can register at most five H9 stompboxes to your account.

No. Algorithm purchases are tied to your user account and not to the stompbox, and purchases are not transferable. Algorithm purchases are made through Apple’s in-app purchasing service, and Apple does not allow in-app purchases or other digital purchases to be transferred.

If you have not used the coupon that comes with the H9 to purchase an algorithm, the coupon will transfer to the new owner of the H9. If you have used the coupon to purchase an algorithm, that algorithm will remain tied to your user account.

H9 Max

Absolutely and it's easy to do. Just purchase enough algorithms to your account to reach the Max Status, use the Restore Purchases feature of H9 Control and your unit will be converted into an H9 Max. From that moment on, it's no different from any other H9 Max. If you own an H9 Core, you will need to have purchased a total of 30 algorithms. For a standard H9, 20 algorithms. 

It's easy to verify what version a particular H9 is by watching the LCD readout when the unit powers on. It will show one of three messages:

  • H9Max
  • H9 
  • H9Core

These version names cannot be set or changed except by Eventide. 

Your H9 core will not become an H9 Max, however that's not really necessary since you can share the algorithms from your H9 Max with up to 4 other H9s (for a total of 5 devices). Keep in mind that if you sell the H9 it will return to the factory default and would then use the algorithms of its new owner. 

Yes. The H9 Max status and algorithms are tied to the pedal, not to the account. This is different than a standard or H9 Core unit where the algorithms are tied to your account and stay with you rather than the device. 


The H9 communicates using the 2.1 version of the Bluetooth protocol, and theoretically, any Bluetooth chip supporting Bluetooth 2.1 should work. In particular we have tested and had success using these two:

StarTech USBBT1EDR2 Mini USB Bluetooth 2.1 Adapter, which can be ordered off of Amazon here:


Kensington (K33956AM) which can be ordered off Amazon here:


We have had mixed success with Bluetooth adapters using the Broadcom chipset, which is used in the BestBuy Bluetooth dongle products from Rocketfish and Insignia and the Inateck® USB Bluetooth 4.0 Low Energy Micro Adapter USB Wireless Bluetooth Dongle among other products. Some users have had trouble getting the Broadcom driver to install successfully. But other users have been able to install the drivers without problems, and those users that have been able to get their Windows computers to install the drivers have also been able to connect to the H9 using these Bluetooth dongles without any problems.

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