What type of input does the tool accept?

It accepts one required vocal audio file through the audio input.

Can I use a mono vocal?

Yes. The tool accepts mono or stereo vocals and always produces a stereo output.

What doubling styles are available?

You can choose Subtle, Classic, Wide, or Thick doubling styles.

Can I control the delay and pitch movement?

Yes. Delay can be set from 5–45 ms, and pitch drift from 0–50 cents.

Which output formats are supported?

The available formats are MP3, WAV, FLAC, M4A, and OGG Vorbis.

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Vocal Doubler (ADT)

Create an artificial-double-tracking style doubled vocal with micro-delay, pitch drift, and stereo widening.

Details

What this tool helps you do

Takes a mono or stereo vocal and synthesizes the classic Artificial Double Tracking (ADT) effect invented at Abbey Road: a slightly delayed (10–40 ms), slightly detuned (±5–25 cents), stereo-spread copy of the performance that the ear fuses with the lead into one thickened, wider take. The tool splits the input, applies a pitch-shifted delayed copy (or a 3-voice left/center/right stack) panned for a wide image, then mixes with the dry lead. Pitch shifting uses FFmpeg's rubberband filter with formant preservation when available, falling back to the asetrate resample trick. Output is always stereo. Optional loudness normalization to streaming levels.

Execution

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Prepared example runs

Click an example to fill the form automatically. File inputs still need an upload.

2 examples

Classic ADT on a mono vocal

A short mono vocal processed with the classic ADT preset (20 ms delay, ±12 cents drift, 60% wet), producing a wide stereo doubled track normalized to −16 LUFS streaming loudness.

Stereo ADT-doubled vocal, −16 LUFS

Wide 3-voice stack on a vocal

A vocal processed with the wide preset, generating a 3-voice (hard-left / center / hard-right) doubled stack with asymmetric delays and opposite pitch drift for maximum stereo width.

3-voice wide stereo doubler

Inputs

Set the required fields, then run the tool.

7 options

FilesUpload source files for this workflow.1

Vocal audiofileRequired

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

SettingsAdjust formats, ranges, numbers, and modes.5

Doubling styleselectRequiredDelay (ms)numberOptionalPitch drift (cents)numberOptionalWet level (%)numberOptionalOutput formatselectOptional

TogglesEnable or disable optional behavior.1

Normalize loudnesscheckboxOptionalEnabled when checked

Result

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Samples

Vocal Doubler (ADT)

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Key facts

Overview

When to use

How it works

Use cases

Examples

1. Classic ADT on a mono vocal

2. Wide three-voice vocal stack

FAQ

Copyright-Free FLAC Audio Samples

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Copyright-Free WAV Audio Samples

Copyright-Free Raw PCM Audio Samples

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