csound

Csound has contributions from numerous audio researchers and musicians since 1991, ensuring a rich, tested foundation for sound computing, as highlighted in the contributor list.

Offers a wide array of unit generators including oscillators, filters, and physical models, enabling complex audio creation and manipulation for synthesis and signal processing.

Runs on desktop, mobile, embedded, and web platforms, providing flexibility for diverse application environments, as noted in the key features.

Provides a C/C++ API for embedding the audio engine into custom applications, facilitating integration and extension, supported by comprehensive API documentation.