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What file types can I upload to be processed?

You may upload MP3 and WAV files, either stereo or mono. Most bitrates are acceptable, however you will achieve better results and higher output quality if the source file is 256kbps or better. Lower bitrate files could potentially sound worse after processing since the artifacts will be enhanced.


Amazon MP3s are good to go. As of now, no iTunes files of any kind will work. We recommend converting M4A files to MP3 using any number of the free converters available on the Interwebz.

We do not accept video files, and do not have plans to do so anytime soon. If you have the ability to decouple and isolate the audio program from a video, you are free to upload that file. Remember, though, that the loudness target will be approximately 7dB higher than what most video productions call for using the EBU R128 standard. You would have to apply gain reduction to the entire file once received.

How long will it take to receive my processed files once they are uploaded?

It depends on two things. If the system is being heavily utilized, it could take several minutes for your files to get all the way through the processing core. Similarly, if you are uploading several hours of content, the processing core will need to spend more time working on your files. Either way, we'll send you an email when you have completed files available for download.

Does FixMyLevels.com simply "normalize" my audio files?


No! In fact, we hate that word.


Simply put, "normalization" is the process of finding the highest peak in an audio file and then making a broad adjustment on the gain to bring that peak to a target level. This does nothing to improve the consistency of your audio's loudness.


We're all about adjusting the loudness of your file so that the human ear perceives the audio to be smooth and consistent from start to finish. This requires automatic gain control and multiband compression, which is fancy talk for splitting the file's audio into multiple frequencies and making gain changes at a nuanced level. The dynamic range of the audio is reduced, which keeps the listener's hands off the volume knob.


At the end of the process, we apply a final limiter to control peaks and increase headroom at the output.

What kind of content can I upload for processing?

FixMyLevels.com was created with podcast producers in mind. The processing is specifically designed to optimize content for the Mobile Audio Standard (-16 LUFS), which is ideal for distribution through iTunes and other aggregators. You'll find that the resulting audio competes well in noisy environments, such as cars, airplanes, and other loud spaces.


We've also found that the processing algorithms are perfect for background music providers that require tight control over their output. Music lovers in general will appreciate the consistency from cut to cut as they move through their libraries.


Just about any type of content sounds better after passing through our processing core. Give it a try and let us know how things are going.


Just remember, we don't accept video files at this time.

Why did you choose -16 LUFS as your loudness target on processed files?

The simple answer...We created this service mainly for producers that are creating audio for consumption on mobile devices. -16 LUFS is considered the standard loudness target for Mobile Audio.


The complicated answer...There are many opinions on what loudness targets should be used when producing audio. Most argue that EBU R128 (-23 LUFS) is the gold standard. Others say that ITU-R BS.1770-3 (-24 LUFS) is the way to go. Both of these standards are typically applied to productions that will eventually end up in the video world, and work well in those scenarios.


But if you are a podcast producer, you are creating audio that is fighting the environment in which it is being consumed. Traffic noise, jet engines, chatty flight attendants, screaming kids. The EBU R128 standard is just not going to cut it. 


The Mobile Audio Standard is widely accepted as -16 LUFS, and is roughly 7dB louder than the EBU R128 standard. Your audio will be more likely to compete at this level, and should also overcome the relatively high noise floor of consumer audio devices, which is usually a cell phone or laptop.

Background music providers will also find our loudness target to be efficient for use with the various digital players and transmission methods in use today.