ayrlmtr

ayrlmtr is a lightweight, open‑source library designed for real‑time audio processing and synthesis on embedded platforms. Developed initially in 2020 by a community of audio engineers and hobbyist programmers, the library targets microcontrollers and single‑board computers with limited memory and processing power, such as the ESP32, Raspberry Pi Pico, and ARM Cortex‑M series devices.

The core of ayrlmtr consists of a modular signal‑flow architecture that allows developers to construct audio pipelines from interchangeable nodes representing generators, filters, effects, and output interfaces. The library provides a set of pre‑built nodes, including sinusoidal oscillators, noise generators, low‑pass and high‑pass filters, delay lines, and basic reverberation. Users can also implement custom nodes in C or C++ and integrate them seamlessly into the processing graph.

Key features of ayrlmtr include deterministic low‑latency performance, a configurable sample rate ranging from 8 kHz to 48 kHz, and a small footprint—typically under 120 KB of flash and 16 KB of RAM for basic configurations. The library is licensed under the permissive MIT license, encouraging adoption in commercial and educational projects.

Documentation for ayrlmtr is hosted on a public Git repository, offering example projects, API references, and guidelines for extending functionality. Since its release, the library has been adopted in interactive art installations, hobbyist synthesizer kits, and prototype acoustic sensing systems.