Helm

Helm is a free, open-source polyphonic semi-modular synthesizer that gives you full creative control over your electronic sound design. With dual oscillators featuring cross modulation, up to 15 oscillators each, and 12 waveforms, you can craft everything from lush pads to aggressive leads. The flexible modulation system includes live visual feedback, multiple LFOs, a step sequencer, and polyphonic aftertouch, making it ideal for producers who love deep sound exploration. Unison and Harmony modes, oscillator feedback, and saturation add rich texture, while seven filter types with keytracking and built-in effects like formant filter, stutter, and delay expand your sonic palette. Helm runs as a VST plugin in FL Studio, Ableton, and Logic on Windows, and it’s perfect for hobbyists and experimental musicians who want a powerful, free synth without sacrificing quality. You own every sound you create.