🚀 Welcome to BlackRatio Studio — Free browser-based music tools, audio-to-MIDI converters, and notation studio!
BlackRatio Studio
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Multi-Instrument Audio to MIDI Track Separation

Break down complex audio into organized musical parts: bass register, chord harmony, and lead melody lines in a multi-track MIDI file.

Upload your MP3 file

Drag & drop your file here, or click to browse (up to 25MB)

.MP3.WAV.MID.XML
Interactive Piano Roll (0 Notes)Click • Drag • Resize • Play
0 notes | BPM: 120
Click empty space to add notes • Drag to move • Drag right edge to resize • Press keys to auditionSelection: None
Ready to export your processed arrangement:

How to Use Multi-Instrument to MIDI

  1. Upload a full-frequency audio track.
  2. Configure track frequency bands (Low/Bass, Mid/Harmony, High/Lead).
  3. Run the multi-band transcription engine.
  4. Audition individual tracks with solo and mute controls.
  5. Export a multitrack MIDI file with separate channels.

Key Capabilities

  • Multi-band spectral filtering and harmonic decomposition
  • Assigns General MIDI instruments per track
  • Individual track solo, mute, and volume balancing
  • Format 1 multitrack MIDI export

Technical Specifications & Acoustic Limitations

Digital audio transcription operates via mathematical frequency tracking and pitch extraction. Clean, monophonic solo recordings with minimal reverberation yield the clearest note boundaries, whereas dense multi-instrument mixes with percussion, distortion, or heavy room ambiance may produce harmonic masking. We recommend reviewing notes in the interactive piano roll or score editor before exporting.

Frequently Asked Questions

How does it separate instruments in the browser?↓

It utilizes multi-band frequency crossover filters combined with harmonic peak clustering to assign notes to Bass, Chords, and Lead tracks.