New Products, EDM News Overtonium Is A Free, Open-Source Additive Synthesizer For Mac, Windows And Linux Sunday, September 27, 2026 Overtonium is a free, open-source 32-partial additive synthesizer that gives each harmonic its own channel-style controls for tuning, envelopes, modulation, stereo placement and level.… Read More Overtonium Is A Free, Open-Source Additive Synthesizer For Mac, Windows And Linux Tags: Synth