ToneBytes – FM-Four VST x32 WiN [free]

FM-Four is a free VST synthesizer for Windows that focuses on four-operator FM synthesis, modelled after the classic Yamaha OPL and OPL2 chipsets. It gives you eight FM algorithms and four operators with both coarse and fine tuning, plus eight selectable waveforms per operator ranging from sine and square to triangle variants. Sound design is handled through four filters, an eight-stage envelope generator for the multimode modulator, distortion, an internal chorus and a ten-band equalizer. A BPM-synced multimode LFO with a random mode adds movement to your patches. The interface keeps things quick with pop-up menus, and a built-in preset manager supports renaming and VST automation, with full MIDI learning for hands-on control. Sixty-four factory presets are included as a starting point. It suits hobby producers on FL Studio, Ableton or similar Windows hosts who want bright, harmonically rich FM tones, retro chip-style leads and basses, or experimental textures without spending anything.