How does the tool calculate the optimal alignment?

It low-passes both tracks to isolate the low end and performs normalized cross-correlation over a configurable search window to find the peak correlation offset.

Which track should I select as the adjustment target?

Shift the bass stem to keep the kick locked to your project grid, or shift the kick stem if the bass line is your primary timing reference.

What does the polarity fix option do?

It tests whether inverting the target track's polarity improves coherent low-frequency summation and applies the flip if beneficial.

How do I choose the search range in milliseconds?

The default 20 ms window handles most standard timing variations; use smaller ranges for tight electronic tracks or larger windows for loose live performances.

Which export formats are supported?

You can export the corrected stem as WAV, FLAC, MP3, M4A, or OGG Vorbis.

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Audio Kick-Bass Phase Aligner

Compare kick and bass timing/phase in the low band, report the offset and polarity, and export the corrected track with sample-accurate alignment.

Details

What this tool helps you do

A low-end alignment assistant for separate kick and bass stems. Both tracks are decoded to PCM, low-passed (4th-order biquad cascade, default 120 Hz), and scanned with a normalized cross-correlation over a configurable ±ms window — the same "nudge until the correlation peaks" workflow engineers do by eye on an oscilloscope. The tool reports the inter-track offset in samples and milliseconds, whether polarity inversion improves the sum, the residual phase angle at the dominant low frequency (a 5 ms offset is 90° at 50 Hz), and how much combined low-end energy the fix recovers. The chosen track is then shifted sample-accurately (and polarity-flipped when recommended), and exported in your format with a post-fix correlation check. Perfectly aligned, in-polarity kick and bass sum coherently; offset or anti-phase pairs cancel audibly.

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Audio Kick-Bass Phase Aligner

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Use cases

Examples

1. Recovering Sub-Bass Punch from Phase Cancellation

2. Aligning Kick Transient to a Leading Bass Line

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Copyright-Free Raw PCM Audio Samples

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