Legato

Legato is a Rust framework for building audio applications using a graph-based architecture. It provides a minimal domain-specific language (DSL) that lets developers construct audio processing pipelines by connecting nodes representing sources, effects, and outputs. The framework abstracts low-level audio handling details whilst maintaining performance, making it suitable for simple audio tools and complex applications like synthesizers or digital audio workstations. The framework targets Rust developers who want to build audio software efficiently. Using a declarative approach through its DSL, Legato reduces boilerplate code and lets developers focus on audio processing logic. The graph-based model is intuitive: define what you want (for example, oscillator to filter to output) and let the framework handle scheduling and execution. Legato is particularly useful for creating tools that need reliable, low-latency audio processing. Its freemium model makes it accessible for experimentation and hobby projects, whilst commercial applications can build on the open-source foundation.