Summary
Cardinal is a free and open-source virtual modular synthesizer plugin and standalone application based on VCV Rack. It targets users who want a self-contained modular synth experience in plugin form, available across multiple platforms and plugin standards.
Features
- Plugin formats supported: AudioUnit, CLAP, LV2, VST2, VST3, and standalone app
- Platforms supported: FreeBSD, Linux, macOS, Windows, and Web
- Includes Rack code plus some third-party and internal utility modules—all in a single binary
- Core modules replaced with Cardinal's own simplified equivalents suited for audio plugins
- Does not load external modules or connect to the official Rack library/store
- Removes VCV branding to avoid trademark issues
- Offers several plugin variants: main (8 audio ins/outs, 10 CV ports), Synth (2 audio outs, instrument type), FX (2 audio ins/outs, effect type), and a Mini variant (limited modules and I/O to support DSP/UI separation)
- Polyphonic support in included modules for ease of use
- Supports MIDI input and output
- Ongoing development with notes on current status and experimental support for some features (e.g., CLAP format is work in progress)
Use Cases and Audience
Cardinal is suitable for musicians, sound designers, and producers wanting a modular synthesizer experience within their DAW or as a standalone app, especially those seeking a fully free and open-source plugin solution without reliance on proprietary module ecosystems.
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