Koshima – AUv3 Plug-in Effect is a professional rhythmic gate and step-sequencer effect designed for mobile music producers and sound designers. Available on the App Store, Koshima runs seamlessly on iPhone and iPad, delivering studio-grade audio processing in a compact, touch-friendly format. It is built specifically for modern iOS music production workflows.

Developed by iceWorks, Koshima is implemented as a AUv3 effect, allowing it to integrate directly inside compatible hosts and digital audio workstations. As an Audio Unit plug-in, it can be used alongside other effects and instruments without leaving your main project, making it ideal for professional and modular music setups.

At its core, Koshima is a 16-step gate sequencer that transforms sustained audio signals into dynamic rhythmic patterns. Each step provides detailed control over volume, amplitude shaping, and filtering, enabling precise rhythmic modulation. This makes Koshima especially useful for creating pulsing synth lines, evolving pads, rhythmic drones, and complex motion-based sound textures.

Koshima shines in advanced sound-design scenarios where precision and flexibility matter. Per-step parameter control allows producers to sculpt intricate rhythmic variations that go far beyond simple trance gates. Whether you are designing ambient soundscapes, experimental electronic music, or modern cinematic textures, Koshima offers the depth required by serious audio engineers and creative musicians.

As a fully compliant AUv3 plug-in, Koshima works smoothly inside popular iOS music environments such as AUM, GarageBand, Cubasis, and other compatible hosts. This flexibility makes it a powerful addition to both live performance rigs and studio-based production workflows.

The interface is clean, functional, and optimized for touch interaction, allowing fast experimentation without disrupting creative flow. While the app includes only a small number of basic presets, it is intentionally designed as a sound-shaping tool rather than a preset-driven effect. This approach gives experienced users full control and encourages hands-on sound exploration.

With strong user ratings and a reputation for high-quality DSP, Koshima stands out as a premium rhythmic gate effect on iOS. For musicians, producers, and sound designers seeking a deep, reliable step sequencer effect within the iOS ecosystem, Koshima delivers professional results in a compact and powerful AUv3 plug-in.