AMY is a high-performance, fixed-point C music synthesizer library designed for microcontrollers and embedded systems, offering a flexible toolkit for creating a wide range of sounds. It supports numerous platforms, from ESP32 to Raspberry Pi and web browsers, making it suitable for developers and hobbyists building audio applications on resource-constrained devices.

How It Works

AMY utilizes a highly optimized C core for efficient audio synthesis, supporting multiple oscillators, filters, and effects. Its unique wire protocol allows for compact, human-readable control messages that can be sent over various communication channels. The library excels at polyphony and poly-timbral operation, even on low-power microcontrollers, and offers advanced features like envelope generators, LFO modulation, and custom breakpoint-based synthesis.

Quick Start & Requirements

• Python: cd src; pip install .
• Arduino: Copy repository to Arduino/libraries/amy, include <AMY-Arduino.h>, and use provided examples. Requires specific board packages (RP2040, Teensy, ESP32) and the MIDI Library for USB MIDI.
• Web: make docs/amy.js
• C: make then ./amy-example
• Dependencies: Python 3.x, Arduino IDE with board support, or C/C++ toolchain.
• Demo: AMY web demo

Highlighted Details

• Supports 16+ waveform types including SINE, PULSE, SAW, NOISE, PCM, ALGO, and PARTIALS.
• Features two Envelope Generators (EGs) per oscillator for complex sound shaping.
• Includes built-in effects like Reverb, Echo, and Chorus.
• Offers FM synthesis with DX7-style algorithms and additive synthesis via analyzed partials.
• Supports loading custom PCM samples and real-time audio input.

Maintenance & Community

• Developed by DAn Ellis and Brian Whitman.
• Active community chat available on Discord.

Licensing & Compatibility

• License: MIT.
• Compatible with commercial and closed-source projects.

Limitations & Caveats

• Debugging options (D parameter) interrupt audio.
• Custom sample loading requires base64 encoding and careful message handling.