OPx-4 delivers powerful four-operator FM synthesis with a straightforward interface designed to inspire creativity. It features wave looping, sample offset, and multiple filter types to shape sounds ranging from classic electric piano tones to unique digital effects. The synth provides deep modulation capabilities through a 32-slot FM matrix and eight assignable macro knobs, making sound design intuitive and enjoyable. A rich collection of preset banks offers immediate access to a wide variety of FM sounds that can suit any musical style.

This FM synthesizer stands out with its flexible wave shaping and dual-mode filter paths featuring 23 filter types, supported by six envelopes with tempo-synced looping, two LFOs, and ramps for dynamic modulation. Integrated effects such as compression, EQ, delay, reverb, and lo-fi processing enhance the sonic palette, allowing users to add depth and character without leaving the plugin. Whether crafting strong attacks, evolving textures, or morphing filtered sounds, OPx-4 makes it accessible to both beginners and experienced producers alike.

OPx-4 is compatible with PC and Mac in VST, AU, and AAX formats, and also works standalone on Akai MPC and FORCE hardware, enabling seamless workflow between hardware and software environments. Its built-in effects engine and extensive modulation options make it a compelling choice for musicians seeking fresh FM synth tones with high creative potential. The plugin’s easy-to-navigate layout encourages experimentation without requiring deep technical knowledge, offering a smooth path to crafting distinctive, professional-quality sounds.