What audio formats and length limits are supported?

You can upload standard audio files up to 100 MB and up to 3 minutes in length.

How does the sub-bass cleanup filter help?

The 30 Hz high-pass filter removes non-musical sub-bass rumble and DC offset introduced during stem separation.

What is the difference between the MIDI sensitivity options?

Gentle detects fewer notes to reduce false triggers, eager captures subtle articulations and extra notes, and standard balances note accuracy.

Why does the MIDI file have a 120 BPM header?

The MIDI uses wall-clock timing under a default 120 BPM header to maintain exact real-time playback alignment.

What information is included in analysis.json?

The ZIP package includes an analysis.json reporting audio RMS levels, low-band energy share, total transcribed note count, and detected pitch range.

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Bass Line Extractor AI

Pull the bass line out of any full mix as isolated audio, a MIDI transcription, or both — powered by local neural stem separation.

Details

What this tool helps you do

Two neural stages run locally in Node. First, HT-Demucs FT (ONNX, the same four-stem model behind our stem separator) separates the upload into drums / bass / other / vocals and keeps only the bass stem. Second, on request, Spotify Basic Pitch (TensorFlow.js) transcribes that stem into MIDI notes — the separated bass is near-monophonic, which is exactly the input Basic Pitch is strongest on. A 30 Hz high-pass can trim the DC-ish rumble separation sometimes leaves. Output modes: isolated bass audio (WAV/FLAC/MP3), a .mid file (Electric Bass program, wall-clock timing at 120 BPM header), or a ZIP with both plus an analysis.json (RMS, low-band share, note count, pitch range). This is an AI draft, not ground truth: expect some bleed from kick drums, missed ghost notes, and octave jumps on very low or distorted bass. Mono-ish mixes and loud, clean bass lines fare best. Up to 3 minutes per job.

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Bass Line Extractor AI

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Key facts

Overview

When to use

How it works

Use cases

Examples

1. Full Bass Extraction to Audio and MIDI

2. Quick MIDI-Only Bass Transcription

FAQ

Copyright-Free FLAC Audio Samples

Copyright-Free MP3 Audio Samples

Copyright-Free WAV Audio Samples

Copyright-Free Raw PCM Audio Samples

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