Elastic OSC is a synthesizer app that uses the DSP code from the popular Mutable Instruments Plaits hardware oscillator module. This module is highly regarded in the Eurorack modular scene, making Elastic OSC a valuable tool for musicians and sound designers. With this app, you can explore a wide range of sounds. It offers everything from analog-style tones and FM synthesis to unique percussive and drum sounds.

You can use Elastic OSC in two main ways: in monophonic mode, where you play one note at a time, or in an 8-voice polyphonic mode, allowing you to play multiple notes simultaneously. The app is designed to be user-friendly. You can play it using the on-screen keyboard or connect an external keyboard or sequencer via your DAW of choice, making integration seamless.

One of the app's standout features is its two XY pads. These pads let you manipulate the OSC engine and effects in an intuitive way. Although the interface is simplified for ease of use, the sound possibilities are extensive. You can choose from 24 different oscillator models and automate parameter changes for a more dynamic sound experience, just like in other Elastic apps.

Elastic OSC also includes a versatile arpeggiator. This allows you to quickly generate musical ideas or create complex sonic landscapes right from the start. You can experiment with different arpeggiator modes, set rates, and use skip notes functionality to add variety to your compositions.

The app has an integrated help system. By tapping the “?” button, you can find explanations for nearly every graphical element, the underlying DSP model, and much of the app's functionality. This is especially helpful for new users who want to get the most out of their experience.

Elastic OSC is packed with features. It includes a total of 24 different sound engines based on the MI Plaits DSP code. Each engine has four main parameters: Frequency, Harmonics, Morph, and Harmo. You can also utilize recordable modulations to control almost all parameters for lengths of 1, 2, or 4 beats.

For those interested in effects, Elastic OSC offers several options. You can explore overdrive distortion effects, a chorus flanger effect, a delay effect, and a reverb effect. Automations for all effects parameters allow for even greater sound shaping. Additionally, you have a master gain control along with a switchable limiter effect.

For deeper sound creation, you can dive into various synthesis types such as virtual analog synthesis, waveshaping synthesis, and granular formant synthesis, among others. Options for additive synthesis and speech synthesis provide even more diversity in sound design. Whether you are interested in bass drum synthesis, hi-hat synthesis, or filtered noise synthesis, Elastic OSC has you covered.

The app also features flexible LFOs. LFO 1 is included for free, while three additional LFOs can be unlocked through in-app purchases. These LFOs can modulate various targets, including frequency, timbre, morph, and harmonics amount. With the MIX view, you can blend multiple LFOs and control how each one affects a target parameter.

Overall, Elastic OSC stands out as a powerful and fun synthesizer app. It’s designed for anyone looking to create unique sounds, from hobbyists to seasoned professionals. With its rich features, user-friendly design, and extensive sound capabilities, it’s a great addition for music makers using iOS devices.