HY-POLY is a polyphonic subtractive synthesizer designed to deliver rich and dynamic sounds. It features multiple oscillator types and dual multi-mode filters, allowing users to sculpt a broad range of tones. The synthesizer supports extensive modulation options with drag-and-drop assignment, enabling creative control over various parameters.

Equipped with numerous MIDI and audio effects, HY-POLY provides a flexible environment for sound design. Users can utilize built-in MIDI effect units alongside a wide selection of audio effects to enhance and transform their patches. The interface is resizable and includes a preset browser for easy navigation and inspiration, while MIDI learn and MIDI out functions improve integration with external gear.

A free version is available with limited features, offering one oscillator mode, up to four voices, and a reduced set of audio effects without MIDI effect units. This version allows users to explore the core synthesis capabilities before upgrading to the full version, which unlocks all oscillators, modulation sources, and effect units for more advanced sound creation.