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Electro-Harmonix B9 Organ Machine Guitar Effects Pedal  

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  • Transform the tone of a guitar or keyboard into that of a convincing full body, electric organ
  • Nine presets that were finely tuned to emulate some of the most popular and classic electric organ tones
  • Control over percussive attack level, modulation speed, organ and dry volume
Description & Specs
  • MSRP:
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    - $73.43
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Reserve Today! Expected to Ship 08-19-2014

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See All Electro-Harmonix Harmonizer, Pitch Shifter, Octave & Ring Modulator Effects Pedals

Transforms the tone of a guitar and/or keyboard into that of a convincing full-body electric organ.

With nine presets that were finely tuned to emulate the most legendary organs from the ‘60s and beyond, the B9 Organ Machine will transform your guitar or keyboard. Control the instrument’s signature percussive click and sweet modulation. Blend your dry signal to create lush layers. Enough tonewheel and combo organ inspiration to light your fire and cook up some green onions.

Preset Descriptions
Fat & Full: This sound adds an extra octave below and above to make your guitar sound twice as big. Fills out any band in an instant. MOD Type: Chorus.
Jazz: This preset has the cool, smooth jazz tone reminiscent of the late great organist Jimmy Smith. MOD Type: Chorus.
Gospel: This preset has the upper octave drawbars added to capture that great soulful organ tone. MOD Type: Chorus.
Classic Rock: This preset captures the classic rock sound of songs like Procal Harum’s “Whiter Shade of Pale.” Add a touch of distortion for a classic dirty organ. MOD Type: Chorus.
Bottom End: This preset has the lower draw bar sound. Perfect for adding bottom to your guitar or playing B3 bass sounds. With the CLICK control up you can lay down a bass line like the one on Sugarloaf’s “Green Eyed Lady.” MOD Type: Chorus.
Octaves: This preset uses the fundamental tone plus one octave above. This sound is great for songs like Led Zeppelin’s “Your Time is Going to Come.” MOD Type: Chorus. CLICK control adds not only key click, but higher harmonics.
Cathedral: Turn up the reverb and you are at the seat of a giant cathedral organ! Psychedelic rock tones easily pour out. MOD Type: Tremolo. CLICK adjusts the tremolo depth.
Continental: This is the classic combo organ sound similar to classic songs “96 Tears,” “Woolly Bully” and “House of the Rising Sun.” MOD Type: Vibrato. CLICK controls vibrato depth.
Bell Organ: If you crossed an electric piano with an organ this is it. MOD Type: Tremolo. CLICK adjusts the amount of bell or chime added to the sound.


  • Transform the tone of a guitar or keyboard into that of a convincing full body, electric organ
  • Nine presets that were finely tuned to emulate some of the most popular and classic electric organ tones
  • Control over percussive attack level, modulation speed, organ and dry volume
  • Rugged and easy to use
  • Bypass Footswitch
  • Dy Output Jack
  • Organ Output Jack
  • EHX 9.6DC-200 PSU included

B inspired. Order this pedal today!

Customer Reviews

Review Snapshot®

by PowerReviews
Electro-HarmonixB9 Organ Machine Guitar Effects Pedal

(based on 3 reviews)

Ratings Distribution

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  • 1 Stars




of respondents would recommend this to a friend.

Reviewed by 3 customers

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(5 of 5 customers found this review helpful)


has bugs - wait for updated version

By negative-nancy

from USA

About Me Experienced


  • Great Company
  • Great For Chordal Work
  • Great Organ Tones
  • Great Variety Of Tones


  • 'click' Sound Unstability
  • Picking-dynamic Problems
  • Poor Rotary Speaker Tone
  • Volume Unstability

Best Uses

  • For practice

Comments about Electro-Harmonix B9 Organ Machine Guitar Effects Pedal:

volume is unstable. its great for chordal work, but lets be honest. alot of people want to do the funky organ riffs/runs and solos. to do this, you have to play very,very hard to keep the organ tone when playing solo. any slight change in picking dynamics causes the drop/gain in volume and thus will cause you to sound like you are missing notes if not picked very hard. its like riding a wave, and its hard to keep consistent in volume when playing solo. compressor helps, but doesnt cure it.
EHX website acknowledges this volume problem but actually blames the amps, and players picking dynamics as fault. EHX website and company quote "some guitar amps have an uneven peak frequency response that may cause sounds to be over accentuated". i own a 1976 fender super reverb, a fender blues deluxe, a fender deluxe reverb, a marshall SLP100 plexi stack, a marshall 50watt blues breaker, a vox ac-4 and ac-30 to name a few. to say the amps are at fault i simply dont believe that. as far as the players dynamics are involved, they quote using a compressor to "help for the guitar player whos playing is less than desirable in the dynamics department" - EXH website. little low blow to their customers, but truth told to them, this pedal makes you have to play very hard and actually long term may cause one to have a less than 'desirable in the dynamics department' style. last, the modulation is 'thin' in sound and not a true rotary speaker sound. the organ tone is 'there' but the rotary backbone of the organ is not. i actually turn off the pedals modulation and combat this with the use of an old univibe, and the difference is night and day in a better, deeper and more true rotary sound, plus the univibe adds the expression pedal to get the slow to fast warbles that organs are known for. i have to use an EQ pedal to smooth highs/lows/mids. i have to use a compressor to help with the volume, etc. BOTTOM LINE - EHX made a GREAT product. its tone is great! but simply put it has bugs. its not perfect. and thats inevitable with a game changing pedal like this, but they are blaming our gear and ability not their product. i would like to see EHX take it back to the boards admit its 'okay' and listen to our complaints and improve for us! last, i would wait, for them to come out with an improved and updated model and buy that one. you may find yourself having to use a lot of other pedals to make this one useful live, as i am.

Comment on this review


Very good,just missing one thing.

By Michael Hundley

from West Palm Bch,Fl

About Me Professional Musician


  • Very Convincing Illusion


  • No Dedicated Leslie

Best Uses

  • Performances

Comments about Electro-Harmonix B9 Organ Machine Guitar Effects Pedal:

This certainly delivers. All the patches are very usable. Only missing item would be a dedicated slow,fast Leslie effect and an extra on off foot switch. I realize that this probably would have made the pedal a little pricey for some.Sounds extremely convincing with a Ventilator pedal in the chain.

Comment on this review

(23 of 23 customers found this review helpful)


Amazing, but not without quirks


from San Diego, CA

About Me Experienced

Ask me a question

Verified Reviewer


  • FUN
  • Good Selection Of Effects
  • Its A Organ Synth Pedal


  • See Description

Best Uses

  • Getting A Thick Organ

Comments about Electro-Harmonix B9 Organ Machine Guitar Effects Pedal:

EHX continues its legacy of producing amazing, innovative and unique effects. I had been using multiple pedals over the years to approximate an organ sound for my guitar with ok results. Then the B9 was released. I found one through a small retailer that had them in stock while everyone else waited. I'm reviewing on MF because its my go-to for research and main retailer for 20 years. Although there is a similar product available, this one is far better at its mission. The 9 presets are all very usable and sound very convincing. If you are even thinking about buying this, do it. It's a blast.

For as much as I love it, I must forewarn; it's bright. The lack of EQ is a bit frustrating. If you are running the effect out to another amp while the dry signal goes to your primary amp, you'll be fine. But using the wet/dry Organ out, you will encounter a lot of harsh top end. I ended up buying a cheap EQ to tame and my old ABY to switch between "off and on". This is a long way around what should have been a simple add-on feature or in leu of the click knob. My other gripe is the Planet Waves patch cables I use constantly slip out of the in/outs. This has me using cheaper blue end cables that actually stay secure. I do not have that problem with other EHX pedals.

All in all, I love it. But I'm fortunate to have a few extra cables and some money to throw at the shortcomings. I hope that EHX listens to concerns and issues an update down the road. For now, I will be having a lot of fun on stage and on record.

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