Apache-2.0 · Dependency-free C++ core · WebAssembly
librosa-compatible analysis, broadcast-grade mastering and mixing, built-in instruments, and a realtime headless-DAW runtime — for C++, Python, and the browser. The C++ core runs native and WASM with no Python runtime, GPL/AGPL code, or model weights.
Try it locally
Every demo runs the same Apache-2.0 processors locally in your browser via WebAssembly.
Audio player with real-time chroma & spectrum visualization.
Hit streaming loudness targets with presets. WAV export.
Structure, harmony, melody, loudness, and spectral views.
Up to eight stem tracks with scene JSON and WAV bounce.
Local microphone voice changer with library character presets.
Estimate room geometry, reverb, and source distance in 3D from a recording.
Play the built-in polyphonic synth from your keyboard or a USB MIDI keyboard.
Step-sequence three tracks, mix them, and bounce the loop to WAV.
libsonare's built-in synth and SoundFont engines render single-track MIDI on-device — practice with falling notes, a lit keyboard, and MIDI scoring.
LIVE FULL DAW · LIBSONARE AUDIO ENGINE
A full DAW in your browser
A complete client-side workstation: sequencing, piano roll, score engraving, a mixer, mastering, and WAV/MP3/MIDI/MusicXML export. libsonare is its audio engine — playback, mixing, mastering, the built-in instruments, and WAV/MP3/MIDI export — while score engraving, MusicXML, and music theory come from separate libraries. It shows how far the audio engine reaches inside a real DAW.
Hosted live demo · source not public · not a production product.
sonare-studio.libraz.net
Use it in your code
import { init, detectBpm, detectKey, analyze } from '@libraz/libsonare'
await init()
const bpm = detectBpm(samples, sampleRate)
const key = detectKey(samples, sampleRate) // { name: "C major", confidence: 0.95 }
const result = analyze(samples, sampleRate)What ships in the box
BPM, key, chords with Viterbi/HMM smoothing, beats, downbeats, time signature, sections, timbre, dynamics, YIN/pYIN pitch, tempogram/PLP, NNLS chroma, LUFS, room-acoustic estimates, and geometric room tools. Defaults are validated against generated reference values in CI.
Feature map →88 named DSP processors in the capability catalog, including 76 solo mastering processors plus pair and creative-insert APIs — loudness, true peak, crossovers, clippers, tube saturation, oversampling — alongside a real-time-safe mixer with channel strips, buses, sends, metering, scene presets, and editing DSP.
Mastering processors →A 15-engine synth with a data-free GM fallback bank and a GS-compatible SoundFont 2 player — MIDI never renders silent. Author projects with audio and MIDI tracks, undo/redo, MIDI sequencing, SMF import/export, offline bounce, and a sample-accurate realtime engine that runs in the browser via AudioWorklet.
Built-in instruments →C++, C, Python, Node, WASM, and CLI under one Apache-2.0 license.