waon ☆

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Description:
Wave-to-notes transcriber

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: Multimedia

Tags: audio midi music signal-processing cli

Install: brew install waon

About:
Waon is a command-line utility that converts audio signals (like WAV files) into MIDI notes using Fast Fourier Transform analysis. It effectively transcribes monophonic pitch data from recordings of single-voiced instruments or humming into editable musical notation. This tool is valuable for musicians and developers needing to extract melodic data from analog sources for use in digital audio workstations.

Key Features:

FFT-based pitch detection for accurate frequency analysis
Converts WAV audio files directly to MIDI format
Command-line interface suitable for batch processing
Supports ALSA and JACK for Linux audio integration

Use Cases:

Transcribing melodies from hummed or played recordings
Analyzing pitch contours in audio research
Converting single-instrument audio tracks to MIDI for editing

Alternatives:

aubiopitch – Part of the aubio library, offering more modern pitch detection algorithms and Python bindings.
sox – A general-purpose audio utility that can perform pitch shifting but lacks dedicated transcription to MIDI.

Version History

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