OctaSine

Create FM synth sounds with four operators and flexible modulation routing.

OctaSine is a synthesizer plugin for VST2- and CLAP-compatible audio workstations on Windows, macOS, and Linux. It provides four operators, four LFOs, ADSR envelopes, and modulation panning for shaping stereo sounds.

Its synthesis engine and plugin implementation are written in Rust, with an Iced-based graphical interface. It runs inside a compatible host rather than as a standalone music workstation.