Desktop Apps

Auphonic Leveler Batch Processor

The Auphonic Leveler is an intelligent Desktop Batch Audio File Processor which analyzes your audio and corrects level differences between speakers, between music and speech and between multiple audio files to achieve a balanced overall loudness.
It includes a True Peak Limiter, targets for common Loudness Standards (EBU R128, ATSC A/85, Podcasts, Mobile, etc.) and automatic Noise and Hum Reduction algorithms.

The Auphonic Leveler is available for Mac OS X 10.6+ (64bit) and Windows 7+ (32bit or 64bit).

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Audio Algorithms

The following algorithms are included in the Auphonic Leveler Batch Processor:
Adaptive Leveler
Our Adaptive Leveler analyzes the content of audio files using machine learning techniques and is capable of balancing loudness variations between segments in one file:
  • Music, background and speech segments are classified
  • Loudness differences between speakers are corrected and dynamic range compression is applied
  • Music segments are processed with care: the overall loudness will be comparable to speech, but the natural dynamics are not changed as in speech segments
  • Background segments (noise, wind, breathing, silence etc.) won't be amplified
  • Most suitable for programs, where dialogs/speech is the most prominent content: podcasts, radio, broadcast, lecture and conference recordings, film and videos, screencasts etc.
This algorithm was trained with over three years of audio files from our web service and keeps learning and adapting to new data every day.
For more details and audio examples see Adaptive Leveler .
Loudness Normalization
Global Loudness Normalization calculates the loudness of your audio and applies a constant gain to reach a defined target level, so that all processed files have the same average loudness. 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.
For details and audio examples see Global Loudness Normalization .
True Peak Limiter
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.
Noise and Hum Reduction
Our Noise Reduction algorithms remove broadband background noise in audio files with slowly varying backgrounds. First the audio file 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. Afterwards the partials are removed as necessary with sharp filters.
For more details and audio examples see Noise Reduction and Hum Reduction.
High Pass Filter
An adaptive High Pass Filter cuts unnecessary and disturbing low frequencies, depending on the context (speech, music or noise).

Parallel Processing of Multiple Files and Presets

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

Processing Statistics and Warnings

Audio Processing Statistics of input and output files 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 audio signals (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 Input SNR <= 15dB. 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.
Supported Input File Formats:
WAV, AIFF, FLAC, MP3, Ogg Vorbis
Mac OS X only: MP4/M4A/M4B, AAC, ALAC, CAF, AC3, MP2, 3GP
Supported Output File Formats:
WAV, AIFF, MP3 (via lame), FLAC, Ogg Vorbis
Mac OS X only: AAC (M4A)


Screenshot 1
  • Empty start screen of the Auphonic Leveler.
    The Audio Algorithms Box (bottom left) shows basic controls to enable/disable the Adaptive Leveler, High Pass Filter, Noise and Hum Reduction and to select a Target Loudness level.
    Drag and drop files or folders to load multiple audio files.

Purchase a License

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

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 Leveler Batch Processor, you are required to register for a free Auphonic account.

Trial Version

The algorithms of the Auphonic Leveler Batch 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 in our online production form with all algorithms included in the Auphonic Leveler Batch Processor.

  • Metadata (Tagging), Chaptermarks management and Automatic Content Deployment features of our web service are not included!
  • This program does not include our Multitrack Algorithms! Please use Auphonic Multitrack for multitrack productions.
Please evaluate our algorithms before purchasing the program:


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