HY-Filter4 is a semi-modular effect plugin designed to offer extensive sound shaping capabilities. At its core, it features a multi-engine filter that serves as the foundation for creative audio processing. This plugin combines a wide range of effect units and modulators, providing users with a rich palette of sonic possibilities.

The plugin includes 38 built-in effect units alongside 10 different types of modulators, creating a total of 42 processing units. Users can modulate parameters of the main filter, the internal effects, and the modulators themselves, allowing deep customization of the sound. Modulation assignments are made intuitive through a drag-and-drop interface, simplifying complex routing.

Control is enhanced by the built-in CTRL SEQ, a grid sequencer that manages both effect and modulator units, enabling dynamic and rhythmic parameter changes. This feature makes HY-Filter4 suitable for evolving textures and intricate sound designs. Owners of previous versions, HY-Filter2 and HY-Filter3, receive this upgrade free of charge.