HY-Filter4 Free

HY-Filter4 FREE is the free version of the semi-modular filter effect plugin by HY-Plugins. It is available in VST2, VST3, and AU formats for Windows and macOS (64-bit hosts only). The free version provides a two-filter engine with SVF and 3BP filter types and five modulation options: LFO, 2DLFO, RND, Env Follower, and XY Control. The full version offers advanced features like a multi-engine filter, 38 built-in effect units, and a grid sequencer.

The interface lets you adjust the Cutoff, Resonance, Morph, and Drive, with modulation easily assignable by dragging to parameters. The Morph knob lets you morph between LP, BP, and HP filter types.