Helm Synth

Active

Country: United States (US)
Founded: 2015
Developer: Matt Tytel
Pricing: Free (open-source)
Open source: Yes
Platforms: Linux, macOS, Windows

Indexes

Audio/Music Production

Overview

Helm is a free, cross-platform polyphonic synthesizer that operates as a standalone program or plugin (LV2, VST, VST3, AU). It features a powerful modulation system, ADSR envelopes, and supports monophonic/polyphonic modes with cross-platform patch loading and saving¹²⁴. Designed for music producers, it runs on major desktop OS and emphasizes free software principles, allowing users to study, modify, and redistribute the code².

Key Features

Polyphonic Synthesis - Supports realtime monophonic and polyphonic synthesis modes¹².
Modulation System - Powerful modulation including LFOs assignable to synth controls²⁴.
ADSR Envelopes - Polyphonic ADSR envelopes for amplitude and filter control⁴.
Plugin Formats - Compatible as LV2, VST, VST3, or AU plugins, plus standalone².
Patch Management - Cross-platform loading, saving, importing, and exporting of patches and banks¹⁵.
Visual Feedback - Animates oscilloscope, envelopes, LFOs, and modulation meters⁵.
MIDI Support - Configurable active MIDI inputs with arpeggiator modes (up, down, as played, random)⁵.
Audio Settings - Adjustable sample rate, buffer size, and audio output device in standalone mode⁵.

Pricing

Plan	Price	Includes
Standard	Free	Full synthesizer features, source code access, all platforms and formats².

Platforms & Requirements

Helm runs on GNU/Linux, macOS, and Windows in 32-bit and 64-bit versions as standalone or plugins (LV2, VST, VST3, AU)¹². No specific minimum requirements listed; adjustable sample rate and buffer size affect CPU usage, with smaller buffers reducing latency but increasing load⁵. No mobile or web support mentioned.

Integrations & Ecosystem

LV2 plugin hosting
VST plugin hosting
VST3 plugin hosting
AU plugin hosting (macOS)
MIDI input devices
Patch/bank import (.helmbank)
Patch/bank export
Standalone audio output devices

Alternatives

App	Difference
Vital	Free wavetable synth with more oscillator options but different modulation approach.
Surge XT	Open-source subtractive synth with extensive modulation matrix and community patches.
Dexed	Free FM synth emulating Yamaha DX7, focused on FM synthesis unlike Helm's hybrid design.
ZynAddSubFX	Open-source additive/subtractive synth with modular structure and LADSPA support.

Reputation

Helm is regarded as a versatile free synthesizer with an intuitive interface and strong modulation capabilities, appreciated by users for cross-platform compatibility and plugin support³. It receives praise for visual feedback and patch sharing but some note higher CPU usage at low buffer sizes⁵. Community tutorials highlight its standalone and DAW integration, positioning it as accessible for beginners and producers³.

Sources (8)