Desktop Apps

Auphonic Multitrack Processor

Auphonic Multitrack takes multiple input audio tracks, analyzes and 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.

Auphonic Multitrack is built for speech-dominated programs and is available for Mac OS X 10.6+ (64bit) and Windows 7+ (32bit or 64bit).


Features   |   Screenshots   |   Purchase a License   |   Trial Version   |   Best Practice   |   Contact


Features


Audio Algorithms


All included algorithms were trained with data from our web service and they keep learning and adapting to new audio signals every day.
Auphonic Multitrack is most suitable for programs, where dialogs/speech is the most prominent content: podcasts, radio, broadcast, lecture and conference recordings, film and videos, screencasts etc.
It is not built for music-only productions.

The following algorithms are included in the Auphonic Multitrack Processor:
Multitrack Adaptive Leveler
The Multitrack Adaptive Leveler analyzes the content of all tracks using machine learning techniques and balances loudness variations:
  • Music, background and speech segments are classified
  • We know exactly which speaker is active in which track and can therefore produce a balanced loudness between tracks
  • Dynamic range compression is applied on speech tracks only – music segments are kept as natural as possible
  • Loudness variations within one track (changing microphone distance, different songs in music tracks etc.) are corrected
  • Background segments (noise, wind, breathing, silence etc.) are classified and won't be amplified
For more details see our Multitrack Audio Example 1, Multitrack Audio Example 3 and our Singletrack Adaptive Leveler Examples.
Adaptive Noise Gate
If audio is recorded with multiple microphones and all signals are mixed, the noise of all tracks will add up as well. The Adaptive Noise Gate decreases the volume of segments where a speaker is inactive, but does not change segments where a speaker is active. All parameters of the gate (threshold, ratio, sustain, etc.) are set automatically according to the current context. This results in much less noise in the final mixdown.
For details and audio examples see Multitrack Audio Example 2 and the other Multitrack Audio Examples.
Crossgate: Crosstalk (Spill) Removal
When recording multiple people with multiple microphones in one room, the voice of speaker 1 will also be recorded in the microphone of speaker 2 and creates a crosstalk (spill), reverb or echo-like effect.
Our multitrack algorithms know exactly when and in which track a speaker is active and can therefore remove the same signal (crosstalk) from all other tracks. This results in a more direct signal and decreases ambience and reverb.
Listen to the details in Multitrack Audio Example 4 and the other Multitrack Audio Examples.
Automatic Ducking and Fore/Background Classifier
Auphonic automatically decides, which parts of your track should be in foreground or background: Speech tracks will always be in foreground. In music tracks, all segments (e.g. intros, songs, background music, etc.) are classified as background or foreground segments and mixed to the production accordingly. If our classifiers do not work for your content, it is possible to force the track to be in fore/background.
We also support ducking to automatically reduce the level of a track if speakers in other tracks are active. This is useful for intros/outros, translated speech or for music segments, which should be softer if someone is speaking.
Listen to the Automatic Ducking Example and to the Fore/Background Audio Example.
Multitrack Noise and Hum Reduction
Our Noise Reduction algorithms remove broadband background noise in audio signals with slowly varying backgrounds. First each track is segmented in regions with different background noise characteristics, then a noise print is extracted in each region and removed from the audio signal. In automatic mode, a classifier decides if and how much noise reduction is necessary.
The Hum Reduction algorithms identify power line hum and all its partials in each track. Afterwards the partials are removed as necessary with sharp filters.
For more details and audio examples see Noise Reduction, Hum Reduction and Multitrack Audio Examples.
Loudness Normalization with True Peak Limiter
Global Loudness Normalization calculates the loudness of the final mixdown and applies a constant gain to reach a defined target level. The loudness is calculated according to latest broadcast standards (ITU-R BS.1770) and Auphonic supports loudness targets for television (EBU R128, ATSC A/85), radio, podcasts, mobile and more.
A True Peak Limiter, with 4x oversampling to avoid intersample peaks, is used to limit the final output signal to the selected maximum true peak level and ensures compliance with the selected loudness target.
For details and audio examples see Global Loudness Normalization .
High Pass Filter
An adaptive High Pass Filter cuts disturbing low frequencies, depending on the context (speech, music or noise) of each track.


Parallel Processing of Multiple Tracks and Presets

The Auphonic Multitrack Processor includes a Parallel Task Queue with configurable CPU, RAM and disk usage.
Just drag and drop your tracks into the program window and the multitrack production will be processed in parallel with your current settings. During processing, the progress is shown in the application.
All your current settings (audio algorithm parameters, parameters of individual tracks, output file options, intros/outros, warnings, hardware settings, etc.) can be saved as Presets.



Processing Statistics and Warnings

Audio Processing Statistics of the master and individual tracks display details about what our algorithms are changing in your files.
They can be used to check compliance with loudness standards (Program Loudness, Maximum True Peak Level, LRA - see EBU TECH 3341, Section 1 ) and certain regulations for commercials (Max Momentary, Max Shortterm Loudness - see Section 2.2). It also shows how much our Adaptive Leveler changes your levels (Gain mean, min, max), statistics about your input tracks (SNR, Background and Signal Level) and much more.

Statistics can be exported as files (manually or automatically) in machine readable JSON, in YAML, or in a human readable text format. The exact file format is the same as in our web service and is documented here.
It is also possible to setup Warnings for quality control or as alerts to manually check problematic segments in your audio: for example, you don't want a MaxMomentary loudness >= -19 LUFS or an Output Loudness Range >= 20 LU. Warnings will be displayed in the application and are also exported to processing statistics files.



Supported Input and Output File Formats

We support a wide range of input and a limited selection of output file formats. Sample rate and bit depth conversions are using the high quality resampling and dithering algorithms of SoX.
Please use lossless audio formats whenever possible.
It is also possible to export all individual, processed tracks as separate files in WAV, WAV (float) or FLAC format for further editing.
Supported Input File Formats:
WAV, WAV (float), AIFF, FLAC, MP3, Ogg Vorbis, Opus
Mac OS X only: MP4/M4A/M4B, AAC, ALAC, CAF, AC3, MP2, 3GP
Supported Output File Formats:
WAV, WAV (float), AIFF, MP3 (via lame), FLAC, Ogg Vorbis, Opus
Mac OS X only: AAC (M4A)


Screenshots


Screenshot 1
  • Empty start screen of the Auphonic Multitrack Processor.
    The Master Audio Algorithms Box (bottom left) shows basic controls to enable/disable the Adaptive Leveler, Crossgate, and to select a Target Loudness level.
    Drag and drop files or folders to load audio tracks.



Purchase a License


We offer two licenses, depending on how you use the Auphonic Multitrack Processor. If you want to buy a site license, have any questions or other licensing needs, please contact us at licensing@auphonic.com.
All bug fixes and software updates up to the next major version can be downloaded and installed for free.

IMPORTANT: Users of the Auphonic Leveler will get a discount of -33% during the payment process!

Discounted License: 69€ or 89$

  • You are an individual, using the software for personal and non-commercial use only.
  • Cannot be licensed by a business, university or other organization.
  • This license is valid for a single human user only.
  • Valid for Mac OS X and Windows versions of the program.

Commercial License: 299€ or 349$

  • You are a business, university or other organization.
  • You are an individual, using the software for commercial purpose and your annual gross revenue exceeds 15.000€ (20.000$).
  • This license is valid for up to 5 users.
  • Valid for Mac OS X and Windows versions of the program.

Please try and evaluate our program and algorithms fully before purchasing. All purchases are final!


All prices are listed in Euro (€) and US-Dollar ($), without taxes. Sales tax or VAT may be charged, depending on where you live. Companies from Europe can use their VAT ID (UID number) to purchase without VAT.
To download and buy the Auphonic Multitrack Processor, you are required to register for a free Auphonic account.


Trial Version


The algorithms of the Auphonic Multitrack Processor are exactly the same as implemented in our web service.
They will be computed offline on your desktop computer: no need to purchase credits for our web service or to upload/download files.


Algorithm section for one track in our online production form. All algorithms are also included in the Auphonic Multitrack Processor.


Master track algorithm section in our online production form. All algorithms are also included in the Auphonic Multitrack Processor.

IMPORTANT:
  • This program is for multitrack productions only (you need at least 2 tracks/files)!
    If you need to process singletrack productions, please use the Auphonic Leveler.
  • Metadata (Tagging), Chaptermarks management and Automatic Content Deployment features of our web service are not included!
Please evaluate our algorithms before purchasing the program:

Multitrack Best Practice


Please read the following practical tips before using the Auphonic Multitrack Processor:
One track is one file
Each track must be opened as a separate file. We do not extract multiple tracks from a multichannel input file.
Tracks start at the same time
All tracks must start at the same time: the length of each track might be totally different, but they have to start at the same time.
Don't mix music and speech
Don't mix music and speech parts in one track/file. Put all music segments into a separate track.
One speaker one track
Please try to put each speaker into a separate track as well.
Not built for music-only mixing
Auphonic Multitrack is not built for music-only productions. It is most suitable for programs, where dialogs or speech is the most prominent content: podcasts, radio, broadcast, lecture and conference recordings, film and videos, screencasts etc.
Take a look at our Multitrack Audio Examples to get a better idea what we can do.
Stereo panorama
We do not change the stereo panorama of individual tracks – please adjust it in your audio editor before using Auphonic Multitrack.
Mono tracks are mixed in centered.
Ambience
If you want to keep the ambience of your recordings, try to deactive the Adaptive Noise Gate or Crossgate.
How should I set the parameter Fore/Background?
  • First, try leaving it at Auto. Then Auphonic automatically decides, which parts of your track should be in foreground or background: Speech tracks will always be in foreground. In music tracks, all segments (e.g. intros, songs, background music, etc.) are classified as background or foreground segments and mixed to the production accordingly. See also Fore/Background Classifier Example.
  • If you set it to Foreground, the whole track will be in foreground. Use this option if music segments in this track should always have a similar loudness as speech tracks or if you add fade ins/outs or some ducking manually in your audio editor. All manual volume changes are preserved in Foreground mode.
  • Set it to Background, if the whole track should be in background: background music, ambience recordings, just some background sounds, etc. See Audio Example 5 / File 2 to get an idea.
  • Set it to Duck this track, to automatically reduce the level of this track if speakers in other tracks are active. This is useful for intros/outros, translated speech or for music segments, which should be softer if someone is speaking. See Audio Example 5 / File 1.


Contact


In case of any problems or questions, please don't hesitate to contact us at support@auphonic.com.
We also build custom versions of our programs and algorithms on request!