What audio formats and source materials work best?

Standard audio files are supported up to 100 MB. Isolated drum stems produce the cleanest transcriptions, whereas full mixes may introduce masking from basslines or synthesizers.

Which drum instruments are transcribed?

The extractor targets three core elements: kick drums (20–100 Hz), snare drums (150–500 Hz body with 2–4 kHz crack), and hi-hats (6–12 kHz).

What MIDI mapping is used for the output file?

The exported MIDI file adheres to the General MIDI drum standard, mapping kick hits to note 36, snare hits to note 38, and closed hi-hats to note 42 with velocities derived from hit strength.

How does the tool handle swing and shuffle rhythms?

It quantizes hits to your chosen grid resolution, supports triplet 8th-note steps, and calculates estimated swing percentages based on off-beat timing offsets.

What files are included in the Full Pack export?

The Full Pack ZIP includes an interactive HTML visual step report, a standard MIDI drum file, pattern data in JSON format, a README summary, and an optional aligned click-track WAV.

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Rhythm Extractor

Analyze a drum track or full mix into a step-sequencer pattern: BPM, beat grid, kick/snare/hi-hat hits quantized per bar, drum MIDI, and an HTML grid report.

Details

What this tool helps you do

Classic automatic drum transcription, no training data needed. Tempo and the beat grid come from onset-envelope autocorrelation; drum hits are detected per register with log-compressed spectral flux — kick 20–100 Hz, snare body 150–500 Hz confirmed by a 2–4 kHz crack within ±30 ms, hi-hats 6–12 kHz — then quantized onto a 16th (or 8th / triplet-8th) grid at tatum level, exactly the pooling modern ADT research uses. The downbeat is anchored to the strongest low-band beat, 4/4 is assumed, and a swing percentage is estimated from how far off-beat eighths land from their grid slots. Deliverables: a standalone HTML report with the step grid, a General MIDI drum file (kick 36 / snare 38 / closed hat 42, velocities from hit strength), a machine-readable pattern JSON, and optionally a click-track WAV aligned to the detected grid — bundled as a ZIP pack, or exported singly. Feed a separated drum stem for the cleanest grid; on a full mix, bass and pads can mask the low band.

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Rhythm Extractor

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Key facts

Overview

When to use

How it works

Use cases

Examples

1. Transcribing a 4-Bar Drum Break to MIDI

2. Generating a Step-Sequencer Report and Click Track

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