Screenshot iPad

iPad with new LFO section

LFO Update 1.2

Update 1.2 brings the long-awaited LFO support to Elastic OSC, a sophisticated LFO engine, which is further enhancing the modular character of Elastic OSC.
With the possibility to record automation for almost every parameter, Elastic OSC was already a modulation monster. But with the new LFO feature, you can now create super-fast and super-slow modulations for the six most important synth parameters, either synced or unsynced to the clock.

LFO 1 is for free, allowing you to try everything, while three additional LFOs can be unlocked via In-App Purchase (US: $3.99, EU: €3.99, UK: £3.99).

Staying true to the Plaits / Elastic OSC philosophy — “Keep it simple, with the greatest impact” — the LFO section focuses on six carefully chosen modulation targets, avoiding complex target-parameter lists and unnecessary scrolling.
All Amount knobs can also be automated/modulated, allowing for dynamic changes in modulation depth over time.

Press & User Feedback

CDM:
„Elastic OSC becomes a must on iOS. It’s fun to use as an instrument in your iPad DAW of choice.“

SYNTH ANATOMY:
„Takes the Mutable Instruments (Plaits) algorithms on a wild trip. A nearly perfect app.“

AMAZONA.DE:
“ Trotz minimalistischem UI bietet die App beeindruckenden Sound und Flexibilität für iOS-Musikmacher.“

User reviews:
„Interesting, useful, and playful synth. I love the XY pads that hide complexity and invite you to just play around and explore.“
„My new favorite ios synth!“
„I’ve been making music for 30 years, and this is absolutely the best sounding iOS synth I have ever had the privilege to experience. I am blown away, the UI, the automation, and it sounds so bubbly and warm. I have pretty much every iOS synth, and on my momma… this is the best sounding.„

Robert Lippok:
„Elastic OSC is incredibly fun to work with from the very first minute. The GUI is really well thought out and has 24 integrated synthesis models, as well as the ability to load DX7 sound banks. Omg, so good.“

Elastic OSC made it into several Best of 2025 lists:

Description

Elastic OSC – A Playful Synthesizer with Multiple Oscillator Modes!
Elastic OSC is a synthesizer app based on the DSP code of the Mutable Instruments Plaits hardware oscillator module (generously made open-source by MI mastermind Émilie Gillet), one of the most beloved and cloned oscillator modules in the Eurorack modular scene!
Like the original, Elastic OSC comes with a wide variety of possible sounds, from analog-style, FM, and additive sounds to physical modeling, percussive, to even drum sounds.
While Plaits is monophonic, Elastic OSC can also be used in 8-voice polyphonic mode. This means you can use it either as a sophisticated, experimental monophonic sound source, like the original, or as a regular polyphonic keyboard with a wide variety of great sounds. Of course, you can also combine both approaches!

You can play the app using the on-screen keyboard, or via an external keyboard / sequencer — whether it’s a DAW like AUM, Cubasis, Logic (using Elastic OSC as an AUv3 plugin), or external hardware.

The first release of Elastic OSC is for the iOS platform, available as a standalone iOS app or an AUv3 plugin. Desktop versions for Windows and Mac (Audio Unit & VST3) will come at a later time.

Elastic OSC is designed for playability and simplicity – much like the Plaits hardware, which uses just four main knobs to control all essential synth parameters. In Elastic OSC, these four core parameters are mapped to an XY pad, allowing for quick and intuitive sound tweaking, while a second XY pad offers direct control over the built-in effects.
Elastic OSC is essentially a one-screen app with no menu diving. Despite its clean and minimal interface, the sonic possibilities are vast: under the surface lie 24 different oscillator models and full parameter automation – as you know from other Elastic apps.

A versatile Arpeggiator makes it easy to start with simple ideas or can already create entire sonic worlds.

Elastic OSC includes an integrated help system (tap “?”) to provide explanations for nearly every GUI element, the underlying DSP model, and most of the app’s functionality.

Price: $12.99 (US) / €14.99 (EU) / £12.99 (UK)

Features


SYNTHESIZER
– 24 Different Sound Engines from MI Plaits DSP code
– 4 Main parameters per synth engine (Frequency, Harmonics, Morph, Harmo)
– Recordable Modulations/Automations for almost all Parameters with a length of 1, 2 or 4 beats.
– ADSR Envelope for Amplifier
– LPG Envelope for Modulations of Timbre, FM, Harmonics
– Adjustable Velocity effect on Volume and/or LPG Modulation

ARPEGGIATOR
– With different Arp Modes, Rates, Octave Ranges and Skip Notes functionality

MASTER FX
– 5 Effects (5 different Overdrive/Distortions, Hi-Low-Filter, Chorus/Flanger, Delay, Reverb)
– Automations for all effects parameters
– Master Gain and switchable Limiter effect

Screenshots iPhone

  • 1.90.5-LLYAWNP52U3EMD2SGMQZZNKIWM.0.1-2
  • 1.90.5-DEIR44UX7R6BR5J5WAB6OWIN64.0.1-4
  • 1.90.5-GUWG3B7Z5AGFG6BLIRKDUBI4GI.0.1-6

Videos

Elastic OSC „LFO“ Update 1.2
Elastic OSC „DX7“ Update 1.1
Elastic OSC Video Playlist
LFO Update Demo-Tutorial by SoundTestRoom
Great Introduction Video by Gavinski
Demo & Tutorial Video by Red Sky Lullaby

Reviews / Announcements


Contact / Support

If you need support or simply want to give feedback, please email to:
eosc 🤘🏿 mominstruments 🏝 com

Future

Updates Plan:
– Add EMP Support
– Android version
– Desktop versions for Windows and Mac (Audio Unit & VST3)

We’re planning to release a stripped-down JUCE project with the integrated original DSP code and a simple GUI on GitHub, as a way of giving back to the open-source community – though it may take until 2026.


Team / Legal

Development:
Oliver Greschke, Baptiste Le Goff, Lucie Gosset, Fredrik Wallberg, Valentin Ackva

Design
Gösta Wellmer

DSP
Engine sounds are derived from the open-source code of the Mutable Instruments PLAITS Eurorack module. Immense thanks to Émilie Gillet for generously sharing this beautifully crafted DSP code!

Portions of this software are derived from Mutable Instruments PLAITS,
© 2016 Émilie Gillet – licensed under the MIT License.