What audio can I upload?

The tool accepts an audio file through the Lead vocal audio input, including mono or stereo vocal recordings.

How many voices can the stack contain?

You can choose 3 voices for a tight texture, 5 voices for a wide stack, or 7 voices for a dense vocal wall.

What does the spread setting control?

It controls how widely the generated voices are placed across the stereo field: narrow, medium, or wide.

What is the Haas delay used for?

A short Haas delay on inner voices adds width beyond panning alone. The available range is 0 to 35 milliseconds.

Which output formats are available?

The result can be exported as MP3, WAV, FLAC, M4A, or OGG Vorbis.

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Backing Vocal Width Expander

Turn a single vocal into a wide stereo harmony stack of 3, 5, or 7 transposed voices panned across the field.

Details

What this tool helps you do

Creates a lush, wide backing-vocal stack from a mono or stereo lead vocal. The input is split into 3, 5, or 7 voices, each transposed by a different interval (octave/5th/3rd above and below) and placed at a constant-power pan position across the stereo field, with optional short Haas delays (5–35 ms) on the inner voices to widen the image beyond what panning alone can do. The result is a thick ensemble/choir texture. Pitch shifting uses FFmpeg's rubberband filter with formant preservation when available, falling back to the asetrate resample trick. Optional loudness normalization to streaming levels.

Execution

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Prepared example runs

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2 examples

5-voice wide backing stack

A lead vocal turned into a 5-voice wide backing stack: octave-below (hard left), 3rd-below (left), lead (center), 3rd-above (right), 5th-above (hard right), with 12 ms Haas widening on the inner voices, normalized to −14 LUFS.

5-voice wide backing stack, −14 LUFS

7-voice wall, narrow spread, no sub-octave

A vocal expanded into a dense 7-voice wall with narrow spread (voices pulled toward center) and the sub-octave removed, for a fuller but more centered ensemble texture.

7-voice narrow backing wall

Inputs

Options are grouped so long tools stay easier to scan.

9 options

FilesUpload source files for this workflow.1

Lead vocal audiofileRequired

Single file max size: 100 MBSupported types: audio/*

SettingsAdjust formats, ranges, numbers, and modes.5

Stack sizeselectRequiredSpreadselectRequiredHaas delay (ms)numberOptionalBacking level (%)numberOptionalOutput formatselectOptional

TogglesEnable or disable optional behavior.3

Include sub-octavecheckboxOptionalEnabled when checkedPreserve formantcheckboxOptionalEnabled when checkedNormalize loudnesscheckboxOptionalEnabled when checked

Result

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Samples

Backing Vocal Width Expander

What this tool helps you do

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Key facts

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How it works

Use cases

Examples

1. 5-voice wide backing stack

2. 7-voice narrow vocal wall

FAQ

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