iPhone Screenshots


Electro-Harmonix, a pioneer since 1968 in the field of sound effects pedals for musicians, has produced an app which is a faithful digital re-creation of their circa 1980 analog cult-classic, The MINI-SYNTHESIZER.

Available for iPad and iPhone (IOS version 8.0 or later), the EHX MINI-SYNTHESIZER accurately delivers all the vintage synth sounds of the original plus modern updates.

EHX President and Founder, Mike Matthews stated: “Fans of vintage synths will appreciate the apps ability to recreate the original’s warm analog sounds and deep funky bass, but because it’s so affordable ($2.99 for phone, $4.99 for tablet) and user-friendly, parents, educators and non-musicians will love it, too.”

The MINI-SYNTHESIZER app comes with 25 presets and the ability to store an almost unlimited number of user presets programs. Audiobus and inter-app audio capabilities are included as well as Aftertouch for iPhone 6s, 6s Plus.

Intuitive, flexible and powerful control are provided by the MINI-SYNTHESIZER’s 12 sliders and nine switches. Here’s a breakdown of the user interface:

OSC Section
- PITCH slider lets the player raise or lower the pitch of the note by +/- 1 octave
- SUB-OCTAVE slider introduces a note one octave below what’s being played for extra bottom
- OCTAVE UP switch causes the note being played to jump up one octave.
- TUNE knob lets the player tune the MINI-SYNTHESIZER to other instruments and sound sources over a +/- 50 cents range.

- PHASE RATE slider adjusts the speed of the phase shifter
- FILTER START sets the start frequency of the filter sweep
- FILTER STOP sets the stop frequency of the filter sweep
- SWEEP RATE controls the speed of the filter sweep
- PHASE switch turns the effect on/off
- 2X FILTER switch changes how the audio passes through the filters (either in parallel or in series)
- Q switch sets the amount of resonance on the filter sweep
- RETRIGGER switch turns the filter retrigger on/off

DELAY Section
- TIME slider adjusts the delay time up to two seconds
- FEEDBACK controls the number of echo repeats
- BLEND adjusts the mix of the original signal and the echo repeats
- DELAY switch turns the effect on/off

REVERB Section
- AMOUNT slider adjusts the reverb effect level
- BLEND slider controls the mix of the wet and dry signals
- REVERB switch turns reverb on/off
- REVERB>DELAY switch lets the user place either Delay or Reverb first in the effects chain for a variety of cool sound effects.

- VOL (Volume) slider adjusts the MINI-SYNTHESIZER’s overall sound output level
- POLY/MONO switch toggles between polyphonic (four notes can be played simultaneously) or monophonic (only one note can be played at a time) modes
- PRESETS pop-down menu displays the presets available and allows the user to instantly select one
- HORIZONTAL slider lets the player adjust the keyboards sounding range over an expansive eight-octave range.
- RIBBON Interface lets the player perform portamento (glide up or down to pitch), vibrato and other expressive playing.

The easy-to-use Electro-Harmonix MINI-SYNTHESIZER App is loaded with great sounds and features and is sure to appeal to serious musicians and non-musicians alike.

- There is a known issue with old iPad and iPhone devices (pre-2012) and the emulation will cause a CPU overload.
- For iPad 2nd gen, iPad 3rd gen, iPad 4th gen, iPad mini 1, mini 2, mini 3, and iPad Air, polyphonic mode limits to 3 voices instead of 4 voices for Holy Grail REVERSE reverb.

- The iPhone version is not meant to perform optimally on the iPad. Be aware that if you download the iPhone version on the iPad you are more prone to glitches and crashes than having the iPad version on the iPad.

What's New

Version 1.1.0

- MIDI Input and Output Functionality Implemented/Improved
- MIDI Aftertouch Issues Fixed
- Preset File Sharing
- MIDI Mapping File Sharing
- Older Devices Optimized - Full functionality implemented except for Reverse Reverb (limited to 3 voices)

Ratings and Reviews

I expected better...


I wanted to like this, I really did. Unfortunately the audio quality is just ok and the level seems low. The biggest issue though is the fact that there is very audible constant crackling the whole time I'm playing the synth. It's even crashed a couple times on my iPhone 7 Plus already and I've only had it not even a full day. Not what I have come to expect from anything carrying the Electro-Harmonix name.

Crackling sound


I really want to like this app, but there are some audio engine issues on my iPhone 6s - lots of high frequency crackles on all of the presets make it unusable for anything serious, and unpleasant for anything playful.

amazing, all encompassing synth app


everything I've been looking for in a synth app! includes all necessary features to be an effective, essentially professional grade synth.. all accessible on a portable app.
meticulous sound design and tone, unique ribbon feature, and flawless implementation of the after touch effect. easy to use and comprehensible without sacrificing quality and complex features. lots of unique features and capabilities that can be utilized by musicians of all levels.


New Sensor Corp.
56.1 MB
Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© New Sensor Corp.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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