# sournd

> Hear it, then build with it.

Audio effect engines for JUCE plugins. Each engine is a tested Rust DSP module behind a small C ABI, with a JUCE module that turns its parameters into an APVTS. Drop one into your plugin with three CMake lines. Effects on audio you supply and instruments you play: never generated music.

- 110 engines: 68 effects across 11 categories and 42 synths you play. 32 are free. Free engines download with no account or email.
- Real-time safe: no allocations, locks or system calls on the audio thread.
- Bit-exact: every engine is tested through the C ABI against its Rust module.
- JUCE 8, CMake. Downloads for macOS universal, Linux (x86_64 and aarch64) and Windows x64 (MSVC).

## Start here

- [JUCE quick start](/docs/juce/index.md)
- [Engine catalogue](/engines/index.md)
- [C ABI reference](/docs/abi/index.md)
- [For AI agents](/docs/ai/index.md)
- [Pricing](/pricing/index.md)
- [Licensing](/docs/licensing/index.md)