Stereo Talking Machine Vocal Formant Filter

The programmable Stereo Talking Machine, Vocal Formant Filter, presents creative vowel shaping that is controlled by the player’s dynamics. Nine selectable Voices deliver vowel sounds such as AH-OO and OW-EE, as well as Bassballs and wah-type dynamic filters.

The Voices can be shaped with individual Attack and Decay controls while Sensitivity adjusts the envelope response. The resulting effects mimic characteristics of human speech and create sounds that are both organic and harmonically rich.

As its name implies, the Stereo Talking Machine possesses true stereo outputs as well as an Effects Loop. An Expression Pedal Input provides real time control over filter sweeps, while nine preset locations let you store and instantly recall favorite programs. The Stereo Talking Machine delivers compelling sound shaping capability with advanced control.

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From the Blog
Posted 7/23/2013

Great demo of the 8 Step Program Analog Expression/CV Sequencer by “JJ Likes Guitar.”

The 8 Step Program plugs into the expression pedal or CV input of other effects pedals and synthesizers delivering rhythmic sequencer control. It can turn an ordinary auto-wah into a step filter, a tremolo into a syncopated pulse effect and a pitch-shifter into an arpeggiator. Here JJ shows what it can do with the Stereo Talking Machine Vocal Formant Filter and the Ring Thing Single Sideband Modulator.

Thanks to JJ for the great video, visit JJ here:

Posted 5/20/2013

Videosongster, Bayu Ardianto, checks in from Indonesia with his latest offering.  The band’s (Lola Bangs the Drum)  message is that love isn’t logical. Bayu says he used a lot of EHX effects in this production, as follows:

HOG Harmonic Octave Generator: pianica, synthesizer
Stereo Electric Mistress Flanger: synthesizer
44 Magnum Power Amp: bass, Rhodes, guitar cabinet
Stereo Talking Machine Vocal Formant Filter: electric guitar
Deluxe Memory Man Echo/Chorus/Vibrato: electric guitar
Ring Thing Single Sidebande Modulator: electric guitar
LPB-1 Linear Power Booster: electric guitar
LPB-1 electric guitar
Big Muff Pi: electric guitar

Posted 4/29/2013

Guitarist, Nadav Bachar, and his bandmates put down a groove using the EHX Stereo Talking Machine. No translation needed.

Posted 12/28/2012

Rob Schwimmer shows off the amazing vocalizing power of the EHX Stereo Talking Machine

Posted 12/3/2012

Theremin + EHX equals an amazing, most human like, vocal presentation.

AlKhwarizmi performs “Ave Maria” on his Moog theremin. A Stereo Talking Machine Vocal Formant Filter adds the voice and a Holy Grail Plus Reverb provides the ambience.


Posted 8/15/2012

ZibbyBone Demonstrates the cool Electro effects possible when using the Stereo Talking Machine with a sequencer. Party on!

Posted 7/23/2012

The EHX Stereo Talking Machine Vocal Formant Filter turns a theremin into an opera star… this is pretty amazing!

Posted 6/8/2012

Keyboard wizard, Jordan Rudess, creates a singing synth with the Stereo Talking Machine Vocal Formant Filter.

For more on Jordan, check him out at

Posted 6/1/2012

Jordan Rudess, plays the Geo Synth through the EHX Stereo Talking Machine Vocal Formant Filter. With chops to spare, Jordan’s day job is as keyboardist for prog rock juggernaut, Dream Theatre. The Stereo Talking Machine mimics the characteristics of human speech to create sounds that are organic and harmonically rich.

Posted 5/24/2012

Theremin + EHX Stereo Talking Machine set to “AH” sound = astonishingly human vocal effect!

Posted 5/1/2012

Rodrigo Lanceloti rocks out from Brazil with the EHX Stereo Talking Machine.


Posted 2/21/2012

steveneudy plays bass guitar through the Stereo Talking Machine.

Posted 2/7/2012

Vintage Guitar checks out the EHX Ravish Sitar Pedal and Stereo Talking Machine. See it here.

Posted 12/6/2011

The Young Guitar Upstart strikes again! This time, young Tommy plays through the EHX Stereo Talking Machine!

Posted 11/30/2011

The prestigious music business magazine, Music Inc., has awarded the new Stereo Talking Machine with a Best Product Award for 2011!

Click here to read the article

Posted 11/17/2011

Bayu Ardianto checks in with EHX from Indonesia. This latest VideoSong from his group, Lola Bangs The Drums, is entitled Kamu, Kamu, Kamu (English translation: You, You, You).

Bayu told Mike Matthews that he used the following Electro-Harmonix gear while producing this VideoSong:

1. Voice Box [pianica]
2. Stereo Talking Machine [wah, electric guitar]
3. Small Stone [electric guitar]
4. Stereo Memory Man with Hazarai [electric guitar]
5. Deluxe Memory Man [rhodes]
6. Neo Mistress [keyboard synthesizer, organ emulation]
7. HOG [keyboard synthesizer, organ emulation]

Previous Bayu videos:

Stay tuned, more Bayu videos coming soon!

Posted 11/1/2011

Legendary Guitarist Rodrigo Lanceloti checks in from Brazil with a video showcasing the POG2 Polyphonic Octave Generator, Stereo Talking Machine and Ring Thing.

Posted 9/6/2011

Britain’s Guitar & Bass magazine takes a look at the EHX Neo Mistress Flanger and Stereo Talking Machine.

Click here to read both reviews

Posted 8/22/2011

Premier Guitar Magazine says, “Electro-Harmonix’s Stereo Talking Machine does an impressive job of getting those legendary talk-box tones and much more.”

Click here to read the review

Posted 8/9/2011

Music Toyz is very articulate on the subject of the new Stereo Talking Machine!

Posted 7/19/2011

Total Guitar says, “perfect for nailing talk box style sounds.”

Click here to read the review

Posted 6/28/2011

Posted 6/15/2011

Gelb Music explores the new EHX Stereo Talking Machine.

Posted 6/6/2011

Studio guitarist Bill Ruppert explores the organic and harmonically rich sound of the Electro-Harmonix Stereo Talking Machine.

Click here to see the settings on the EHX forum

Posted 5/31/2011

Gearmandude demos the EHX Stereo Talking Machine Vocal Formant FIlter.

Posted 4/13/2011

Felipe Sousa demos the soon-to-be-released Stereo Talking Machine, Vocal Formant Filter at the Musik MESSE trade show in Frankfurt, Germany.

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Quick Specs
Vocal Vowel Filter w/ 7 vowel modes
Wah and Baseballs modes
Adjustable Sensitivity control allows both up and down filter sweeps
Attack and Decay knobs control the speed of the envelope follower while it sweeps the filters
External effects loop capability allows effects to be placed on the filters without changing the envelope follower's dynamics.
9 Presets
9 Volt power supply provided
Dimensions in inches: 4.75 (w) x 5.75 (l) x 2.5 (h)
Dimensions in mm: 146 (w) x 121 (l) x 64 (h)
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