Multitrack

A multitrack production takes multiple parallel input audio tracks, processes them individually as well as combined and creates the final mixdown automatically. Leveling, dynamic range compression, gating, noise and hum reduction, crosstalk removal, ducking and filtering can be applied automatically according to the analysis of each track. Loudness normalization and true peak limiting is used on the final mixdown.
For more details see Multitrack Post Production Algorithms.

Auphonic Multitrack is built for speech-dominated programs.
All tracks must be opened as separate files and start at the same time: speech tracks recorded from multiple microphones, music tracks, remote speakers via phone, skype, etc.

Click here to create a new multitrack production in our web system: https://auphonic.com/engine/multitrack/

Note

If you want to process a single (master) mono or stereo audio file, please use a Singletrack Production instead!

Warning

Multitrack is much more complicated to use compared to our Singletrack Version.
Please read and understand the Multitrack Best Practice in detail before creating a Multitrack Production!

Audio Tracks and Algorithms

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Select one audio source file per track and configure track-specific Multitrack Audio Algorithms (see also Master Audio Algorithms).
You can upload files directly in the browser, use HTTP links or any supported External Services (FTP, Dropbox, S3, Google Drive, SFTP, WedDAV and many more - please register the service first).

Supported filetypes:
MP2, MP3, MP4, M4A, M4B, M4V, WAV, OGG, OGA, OPUS, FLAC, ALAC, MPG, MOV, AC3, EAC3, AIF, AIFC, AIFF, AIFFC, AU, GSM, CAF, IRCAM, AAC, MPG, SND, VOC, VORBIS, VOX, WAVPCM, WMA, ALAW, APE, CAF, MPC, MPC8, MULAW, OMA, RM, TTA, W64, SPX, 3PG, 3G2, 3GPP, 3GP, 3GA, TS, MUS, AVI, DV, FLV, IPOD, MATROSKA, WEBM, MPEG, OGV, VOB, MKV, MK3D, MKA, MKS, QT, MXF.
Please let us know if you need an additional format.

For lossy codecs like MP3, please use a bitrate of 192k or higher!

Track Identifier
Enter a name for the current audio track.
This field is used as the speaker name in Speech Recognition.
Foreground, Background or Ducking Track
Force the track to be in foreground or background. Use Ducking to reduce its level if speakers are active.
If set to Auto, Auphonic automatically decides which parts of your track should be in foreground or background.
High-Pass Filtering
Classifies the lowest wanted signal (male/female speech, base in music, etc.) and adaptively filters
unnecessary/disturbing low frequencies in each audio segment.
Automatic Noise and Hum Reduction
Classifies regions with different backgrounds and automatically removes noise and hum in each region.
For details and examples see Noise and Hiss Reduction and Hum Reduction!
Noise Reduction Amount
Maximum noise and hum reduction amount in dB, higher values remove more noise. In Auto mode, a classifier decides if and how much noise reduction is necessary (to avoid artifacts).
Set to a custom (non-Auto) value if you prefer more noise reduction or want to bypass our classifier, but be aware, this might result in artifacts or destroy music segments!

Intro and Outro

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Automatically add an Intro/Outro to your production.
IMPORTANT: this feature is audio-only and does not work with video productions!

As intros/outros are intended to be used multiple times, they are only Loudness Normalized to match the loudness of your production without further Auphonic processing (no leveling, filtering, noise reduction, etc.). Therefore you should edit/process your intro/outro before.
For a detailed description of our intro/outro feature, please see the blog post Automatic Intros and Outros in Auphonic .

Select Intro File
Select your intro audio from a local file, HTTP or an External Service
(Dropbox, SFTP, S3, Google Drive, SoundCloud, etc. - please register the service first).
Intro Overlap
Set overlap time in seconds of intro end with main audio file start, for details see Overlapping Intros/Outros .
IMPORTANT: ducking must be added manually to intro audio file!
Select Outro File
Select your outro audio from a local file, HTTP or an External Service
(Dropbox, SFTP, S3, Google Drive, SoundCloud, etc. - please register the service first).
Outro Overlap
Set overlap time in seconds of outro start with main audio file end, for details see Overlapping Intros/Outros .
IMPORTANT: ducking must be added manually to outro audio file!

Basic Metadata

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Basic metadata (title, cover image, artist, album, track) for your production.
Metadata tags and cover images from input files will be imported automatically in empty fields!

We correctly map metadata to multiple Output Files .
For details see the following blog posts: ID3 Tags Metadata (used in MP3 output files), Vorbis Comment Metadata (used in FLAC, Opus and Ogg Vorbis output files) and MPEG-4 iTunes-style Metadata (used in AAC, M4A/M4B/MP4 and ALAC output files).

Cover Image
Add a cover image or leave empty to import the cover image from your input file.
If a Video Output File or YouTube export is selected, Auphonic generates a video with cover/chapter image(s) automatically!

Extended Metadata

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Extended metadata (subtitle, summary, genre, etc.) for your production.
Metadata tags from input files will be imported automatically in empty fields!

We correctly map metadata to multiple Output Files .
For details see the following blog posts: ID3 Tags Metadata (used in MP3 output files), Vorbis Comment Metadata (used in FLAC, Opus and Ogg Vorbis output files) and MPEG-4 iTunes-style Metadata (used in AAC, M4A/M4B/MP4 and ALAC output files).

Subtitle
A subtitle for your production, must not be longer than 255 characters!
Summary / Description
Here you can write an extended summary or description of your content.
Append Chapter Marks to Summary
Append possible Chapter Marks with time codes and URLs to your Summary.
This might be useful for audio players which don’t support chapters!
Create a Creative Commons License
Link to create your license at creativecommons.org.
Copy the license and its URL into the metadata fields License (Copyright) and License URL!
Tags, Keywords
Tags must be separated by comma signs!

Chapter Marks

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Chapter marks, also called Enhanced Podcasts, can be used for quick navigation within audio files. One chapter might contain a title, an additional URL and a chapter image.
Chapters are written to all supported output file formats (MP3, AAC/M4A, Opus, Ogg, FLAC, ALAC, etc.) and exported to Soundcloud, YouTube and Spreaker. If a video Output File or YouTube export is selected, Auphonic generates a video with chapter images automatically.
For more information about chapters and which players support them, please see Chapter Marks for MP3, MP4 Audio and Vorbis Comment (Enhanced Podcasts) .

Chapter marks can be entered directly in our web interface or we automatically Import Chapter Marks from your input audio file.
It’s also possible to import a simple Text File Format with Chapters , upload markers from various audio editors (Audacity Labels, Reaper Markers, Adobe Audition Session, Hindenburg, Ultraschall, etc.), or use our API for Adding Chapter Marks programmatically.
For details, please see How to Import Chapter Marks in Auphonic .

Chapter Start Time
Enter chapter start time in hh:mm:ss.mmm format (examples: 00:02:35.500, 1:30, 3:25.5).
NOTE: You don’t have to add the length of an optional Intro File here!
Chapter Title
Optional title of the current chapter.
Audio players show chapter titles for quick navigation in audio files.
Chapter URL
Enter an (optional) URL with further information about the current chapter.
Chapter Image
Upload an (optional) image with visual information, e.g. slides or photos.
The image will be shown in podcast players while listening to the current chapter, or exported to video Output Files.
Import Chapter Marks from File
Select a Text File Format with a timepoint (hh:mm:ss[.mmm]) and a chapter title in each line or Import Chapter Marks from Audio Editors .
NOTE: We automatically import chapter marks form your input audio file!

Output Files

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Add one or multiple output file formats (MP3, MP4, Ogg, WAV, Video, ...) with bitrate, channel and filename settings to a production (see Audio File Formats and Bitrates for Podcasts ). All Metadata Fields and Chapter Markers will be mapped to multiple output files. See below for a list of other, specialized output formats.
With Auphonic you can process video input files as well, or automatically generate a video output file from input audio using Cover and Chapter images - for details see Video Input and Output .

Supported audio output file formats:

Other output file formats:

Output File Basename
Set basename (without extension) for all output files or leave it empty to take the original basename of your input file.
Output File Format
For an overview of audio formats see Audio File Formats and Bitrates for Podcasts .
Audio Bitrate (all channels)
Set combined bitrate of all channels of your audio output file.
For details see Audio File Formats and Bitrates for Podcasts .
Filename Suffix (optional)
Suffix for filename generation of the current output file, leave empty for automatic suffix!
Filename Ending, Extension
Filename extension of the current output file.
Mono Mixdown
Click here to force a mono mixdown of the current output file.
Split on Chapters
If you have Chapter Marks, this option will split your audio in one file per chapter.
All filenames will be appended with the chapter number and packed into one ZIP output file.

Speech Recognition

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Auphonic built a layer on top of multiple engines to offer affordable speech recognition in over 80 languages:
1. First you have to connect to an external Speech Recognition Service at the External Services page.
2. Then you can select the speech recognition engine when creating a new Production or Preset.

We send small audio segments to the speech recognition engine and then combine the results, add simple punctuation and structuring to produce 3 Output Result Files : an HTML transcript, a WebVTT/SRT subtitle file and a JSON/XML speech data file.
If you use a Multitrack Production, we can automatically assign speaker names to all transcribed audio segments.

For more details about our speech recognition system, the available engines, the produced output files and for some complete examples in English and German, see the blog post Make Podcasts Searchable .

Select Service
Select an external service for Automatic Speech Recognition . Please register a service first!
Select Language
Select a language/variant for speech recognition.

Google Speech API

Word and Phrase Hints
Add Word and Phrase Hints to improve speech recognition accuracy for specific keywords and phrases.
Metadata (chapters, tags, title, artist, album) will be added automatically!

Wit.ai Speech Recognition

Wit.ai Language
The language must be set directly in your Wit.ai App .
IMPORTANT: If you need multiple languages, you have to add an additional Wit.ai service for each language!

Publishing / External Services

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Copy one or multiple result files to any External Service (Dropbox, YouTube, (S)FTP, SoundCloud, GDrive, LibSyn, Archive.org, S3, etc.):
1. First you have to connect to an external service at the External Services page.
2. Then you can select the service when creating a new Production or Preset.

When exporting to Podcasting/Audio/Video Services (SoundCloud, YouTube, Libsyn, Podigee, Spreaker, Blubrry, Podlove, etc.), all metadata will be exported as well.
For a complete list and details about all supported services, see Auphonic External Services.

Select Service
Select an external service for outgoing file transfers. Please register your service first!
Output Files to copy
Select which Output File should be copied to the current external service.

YouTube Service

YouTube Privacy Settings
Set your video to Public (everyone can see it), Private (only your account can see it) or
Unlisted (everyone who knows the URL can see it, not indexed by YouTube).
YouTube Category
Select a YouTube category.

SoundCloud Service

SoundCloud Sharing
Set your exported audio to Public or Private (not visible by other users).
SoundCloud Downloadable
Select if users should be able to download your audio on SoundCloud, otherwise only streaming is allowed.
SoundCloud Type
Select a SoundCloud type/category.
SoundCloud Audio File Export
Select an audio output file which should be exported to SoundCloud.
If set to Automatic, Auphonic will automatically choose a file.

Spreaker Service

Spreaker Collection / Show
Select your Spreaker Collection where this track should be published.
Each Collection has a separate RSS feed and can be created in your Spreaker Account .
Spreaker Sharing
Set your exported audio to Public or Private (not visible by other users).
Spreaker Downloadable
If disabled, listeners won’t be able to download this track and it won’t be included in your RSS feed.

Master Audio Algorithms

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Enable/disable master audio algorithms, track-specific algorithms can be set in section Track Audio Algorithms.
For more details about our algorithms see Auphonic Multitrack Algorithms!

Multitrack Adaptive Leveler
Corrects level differences between tracks, speakers, music and speech, etc. to achieve a balanced overall loudness.
For details and examples see Multitrack Adaptive Leveler.
Adaptive Noise Gate
The gate will decrease background noise if a speaker/track is not active.
For details and examples see Adaptive Noise Gate.
Crossgate
Analyzes which speaker is active and decreases crosstalk/spill, ambience, reverb and noise recorded from other tracks.
For details and examples see Crossgate: Crosstalk (Spill, Reverb) Removal.
Deactivate the crossgate if you want to keep the full ambience of your recording!
Loudness Target
Set a loudness target in LUFS for Loudness Normalization, higher values result in louder audio outputs.
The maximum true peak level will set automatically to -1dBTP for loudness targets >= -23 LUFS (EBU R128) and to -2dBTP for loudness targets <= -24 LUFS (ATSC A/85).
For details and examples see Global Loudness Normalization and True Peak Limiter.