WebAudioFont is a browser-based sample synthesis library that enables playback of SoundFont instruments (GeneralUserGS, FluidR3, etc.) via the Web Audio API. It provides a comprehensive set of classes: `WebAudioFontPlayer` for scheduling notes, chords, and strums; `WebAudioFontLoader` for dynamic loading of instrument presets from an external GitHub Pages repository; `WebAudioFontChannel` for a 10-band equalizer; `WebAudioFontReverberator` for convolution reverb with a built-in impulse response; and `WebAudioFontTicker` for requestAnimationFrame-based sequencing. The library is written in TypeScript, compiled into a single bundled file (`WebAudioFontPlayer.js`), and includes numerous interactive HTML examples (piano, drums, MIDI player, custom samples) that demonstrate real-world usage. Architecturally, the library is a monolith with well-defined modules but no formal test suite. It relies on an external data repository for instrument sound data, which is fetched as JavaScript files defining global variables. The core player uses a queue-based scheduling system with envelope reuse and zone/preset selection. The channel and reverberator classes form a modular audio graph that can be connected to the audio context destination. The library is licensed under GPL-3.0 and is actively maintained by a single developer, with recent commits and a responsive issue tracker. However, the external data dependency and lack of testing pose moderate risks for long-term stability.
Just a Sample is a modern, open-source audio sampler plugin for VST3 and AU formats, built with the JUCE framework. It provides sample playback with time-stretching and pitch-shifting (via the Bungee library), a reorderable FX chain (reverb, chorus, distortion, EQ), waveform editing, recording, and microtonal tuning support via MTS-ESP. The architecture is a single plugin with a modular internal design: the core audio processing lives in CustomSamplerVoice, while UI components like SampleEditor, SampleNavigator, FxChain, and CustomLookAndFeel are separated into distinct modules. Effects are implemented as independent classes (Reverb, Chorus, Distortion, BandEQ) with a common interface. The project also includes Reaper-specific VST3 extensions for tighter DAW integration. The codebase demonstrates solid engineering practices with custom UI patterns, thread-safe sample loading, and a theme system supporting dark/light modes. While some parts show active development (TODOs, experimental features), the overall structure is clean and well-organized, making it a good reference for JUCE-based plugin development.