This synthesizer emulates male voice vowels in a unique way. Thanks to a set of powerful parameters you can make Jussi sing anything from soft and airy choir-like vowels to hard and angry shouting.
Formants are controlled by playing with different velocity, which makes it fun and easy to play using a MIDI keyboard.


• AUv3, works with AUv3 compatible hosts like Garageband, Cubasis, AUM etc.

• ADSR with ”Turn-in” and ”Turn-out” option (Turn-in and Turn-out affects the pitch and maps it to attack and release)

• Voice character XY pad (Intensity and Narrowness)

• Legato mode (glides between notes and velocity levels)

• Legato Hold mode (polyphonic legato when using a sustain controller, consult the documentation for more info)

• Throat emulation XY pad (Grain and Tonality)

• Built-in reverb

Note: Jussi in stand-alone mode does not support IAA, Audiobus or MIDI. You can play it using the keys at the bottom, but that’s it. We recommend using Jussi with AUv3 compatible hosts.

iPhone 6 or later is recommended.
iPad 4 or later is recommended.

Documentation is available at

Feedback or suggestions? Drop us a mail: support(at) or @klevgrand on Twitter

What’s New

Version 1.0.2

• New preset system allowing users to save presets in standalone mode. If you’ve saved presets in AUv3 mode, these will be synced after the first launch in AUv3 mode.
• Fixed a rare bug causing noise when playing notes some times.

Ratings and Reviews

3.3 out of 5
7 Ratings

7 Ratings

Mandi Muffins ,


so i wasn’t looking for this. it was basically a waste of my $7. but it’s still good to annoy my friends with high pitched drill-like noises!

Tenente ,

Does what it does

This is a vocal synth. It produces a synthesized voice. There are a few variables to control but this is not subtractive, modular, granular or FM synthesis. It’s a voice w/ some parameters to adjust but it’s still the same voice.
There’s not a way to control the vowels that the voice sings. In fact, it makes a sound that is like all vowels combined or perhaps, absent of any vowel sounds at all. It’s like a voice singing trying to sing “aahhhhhh” but it sounds more like “uyghhhhhhh”.
You can get a lot of weird sounds from it. It definitely sounds like a voice. It’s klevgrand so it’s good.
I think it’s great.
I read the reviews first.
I got exactly what I was expecting and hope this helps someone else to expect exactly what they’re getting.

Zaondo ,

Look up a video

Look up a video so you know what you are buying. I got what I wanted cause they don’t have other voice synth apps like this. Wish they had more voices though or more voice apps. Wish it was cheaper

App Privacy

The developer, Klevgränd produkter AB, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


Klevgrand Produkter AB
43.1 MB

Requires iOS 9.1 or later. Compatible with iPhone, iPad, and iPod touch.

Age Rating


  • Family Sharing

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

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