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

3.2 out of 5
5 Ratings
5 Ratings


Ben Efitofadoubt

Driving this with SP Pro and getting some beautiful
Here Come The Warm Jets sounds.
What a great app!


Groovy Rob

If you're looking for an app to sing on your recordings, forget this app. It has one voice and one sound, regardless the handful of settings.



I cant believe I paid $4.99 for this. (With the claim/sales pitch that it was "on sale 37.5% off for a limited time") If I'd paid $0.99, I'd feel more comfortable about paying anything at all to have this gimmicky male voice generator to play around with, albeit it an Neanderthal man's voice "moaning and groaning" generator. It's a good app idea that sadly feels like it hasn't been finished, and not seen through to the final product. No midi support, so the velocity sensitive iPad screen, to get different sounding vowels as you tap the virtual keyboard keys, is pretty lack luster, and random...sometimes not changing at all. MIDI support would be a huge difference! If you do get an interesting sound out of it, that you could possibly use in a musical composition, which I admit, I have created an interesting sound that I falls short, once again, as there is no function to save that "interesting sound" as a user preset, to call up again to use later in a recording of your composition. After continuing to mess around, changing the parameters, to get a different sound....results in losing the exact setting for the tone/sound you liked. Good luck getting the exact configuration on the given parameters, as the UI is lacking in any exact measurement, for may get close to it...but, not exactly. Bottom line...I was excited about this app, and what I could do with it, musically, in my music compositions. I thought i was getting more for my money. I could have walked out into the street, and asked any random guy passing by to give me his best caveman impersonation, recorded it with my iPad, and I'd be $4.99 richer than what I am now! Well done, the people that created, and sold me this app. You've got my money, and now you've got my review. The sounds I'm making now, kicking my own butt...I need to sample that! "OoooohAhhhhhhHmmmmm"...sounds familiar!


Klevgrand Produkter AB
43.1 MB
Requires iOS 9.1 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© Klevgränd Produkter AB


  • Family Sharing

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

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