# Vocal Doubler (ADT) Create an artificial-double-tracking style doubled vocal with micro-delay, pitch drift, and stereo widening. > Canonical page: https://elysiatools.com/en/tools/audio-vocal-doubler - **Category:** Media - **Keywords:** vocal doubler, adt, artificial double tracking, stereo widening, vocal thickening, haas, double tracking ## Overview 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. ## Inputs - **Vocal audio** (file) - **Doubling style** (select) - **Delay (ms)** (number) - **Pitch drift (cents)** (number) - **Wet level (%)** (number) - **Normalize loudness** (checkbox) - **Output format** (select) ## When to use - Add width and thickness to a lead vocal without recording a second take. - Create a classic artificial double-tracking effect with controlled delay and pitch drift. - Build a pronounced stereo vocal stack for choruses, hooks, or layered parts. ## How it works - Upload a mono or stereo vocal audio file. - Choose a doubling style: subtle, classic, wide, or thick. - Adjust delay from 5–45 ms, pitch drift from 0–50 cents, and wet level from 0–100% when needed. - Optionally normalize loudness, then export the stereo result as MP3, WAV, FLAC, M4A, or OGG Vorbis. ## Use cases - Thicken a lead vocal for pop, rock, and electronic productions. - Add a classic ADT character to a vocal without manually editing a second performance. - Create a wide left-center-right vocal stack for choruses and featured hooks. ## Frequently asked questions ### 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. ## Related tools - [Audio Stutter](https://elysiatools.com/en/tools/audio-stutter): Create a stutter or glitch effect - [Image Sequence to Video](https://elysiatools.com/en/tools/image-sequence-to-video): Convert uploaded image files or a ZIP archive of frames into a video, sorted naturally by filename - [Podcast Chapter Marker Builder](https://elysiatools.com/en/tools/podcast-chapter-marker-builder): Build every podcast chapter format from one timecoded list: Podcasting 2.0 JSON + RSS tag, ID3v2.4 CHAP+CTOC burned into an MP3, Vorbis comments, mp4chaps, YouTube timestamps and SRT, with a per-player support matrix. - [Karaoke Vocal Reducer](https://elysiatools.com/en/tools/audio-karaoke-track): Attempt to remove vocals from a stereo track - [Voice Gender Privacy Filter](https://elysiatools.com/en/tools/audio-voice-gender-privacy-filter): Shift pitch/formant cues and dynamics to reduce simple speaker-identification cues while preserving duration. - [Convert GIF to WebM](https://elysiatools.com/en/tools/gif-to-webm): Convert GIF images to WebM video format with modern compression and web optimization - [Audio Podcast Loudness Compliance Report](https://elysiatools.com/en/tools/audio-podcast-loudness-compliance-report): Compare integrated LUFS, true peak, LRA, stereo/mono, bitrate and sample rate against Apple Podcasts, Spotify, YouTube, ACX and broadcast targets. - [Image Composite Matrix](https://elysiatools.com/en/tools/image-composite-matrix): Apply composite transformation by combining multiple basic transformations (scaling, rotation, shearing). See how transformation matrices multiply and create complex effects. ## Samples - [Copyright-Free FLAC Audio Samples](https://elysiatools.com/en/samples/flac-samples): Lossless FLAC audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music - [Copyright-Free MP3 Audio Samples](https://elysiatools.com/en/samples/mp3-samples): Collection of royalty-free audio samples for testing and development purposes including nature sounds, meditation music, and ambient audio - [Copyright-Free WAV Audio Samples](https://elysiatools.com/en/samples/wav-samples): Uncompressed PCM WAV audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music - [Copyright-Free Raw PCM Audio Samples](https://elysiatools.com/en/samples/pcm-samples): Raw PCM s16le audio samples featuring nature ambience and relaxing music for waveform, playback, and conversion workflows ## Related content - [Karaoke, Stem Separation & Vocal Tools](https://elysiatools.com/en/hubs/karaoke-and-stem-separation-tools): Remove vocals for karaoke tracks, split songs into stems, isolate or double vocals, slice beats, and balance your mix with free browser-based audio tools. - [Audio Preview, Tone, and Effect Generator Tools](https://elysiatools.com/en/hubs/audio-generate): Compare audio preview generation, silence creation, ringtone building, fingerprinting, loudness reports, and effect-style audio generators in one hub. - [Audio Encoding and Format Conversion Tools](https://elysiatools.com/en/hubs/audio-convert): Compare audio format conversion, bitrate changes, sample-rate conversion, codec swaps, and export tools in one hub for delivery and archive workflows. - [Audio Editing and Cleanup Tools](https://elysiatools.com/en/hubs/audio-utility): Compare audio trimming, silence removal, fades, mixing, and denoise tools in one hub for podcast, voiceover, and music cleanup workflows.