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Working with Audiobooks

Updated: Aug 2

I've dealt with couple of audiobooks in the past and would like to share my experience with you, along with its technical process.


(I'm assuming that you've the recorded files and the script ready to handover to your editor.)


This process is divided into 4 parts -

  1. Cleaning,

  2. Editing,

  3. Mixing,

  4. Mastering.

Now let's dive into each process.

A spectrogram of an audio
A spectrogram works best in this process.

  1. CLEANING - It means removing the

  2. background noises (dirt),

  3. electronic noises

  4. Mouth clicks/chaps/licks,

  5. small breaths,

  6. plosives,

  7. windy rustle,

  8. clipping/distortion,

  9. Gain Staging.

We can do more during the cleaning process, like controlling the Esses (sibilance), applying EQ, etc. But try to avoid doing this, because we will have much control during the Mixing Process.



2. EDITING - Import the files in your editing software. I use 2 screens while editing an audiobook. One screen for editing and one for reading the script simultaneously. The main goal of editing is to make the audio sound seamless without any unnatural cuts.

Sometimes the speaker stretches the words, mispronounces, stutter without even realizing, so you might have to find replacement words in those audios to replace these mistake. Or try a combination of parts of various words to make one word.


Editing an audio file
Making a word out of small audio files

This process mainly includes removing of -

  • Filler Words

  • Retakes

  • Stutters

  • Coughs, Sneezes, Burps

  • Ums and Ahs

  • Breaths

  • Unwanted noises e.g. Dog Bark, Door Knock etc.,

  • Gain Staging.

This process requires carefully listening and focus of finding errors, sitting for long hours watching the given script and making the best version of the audio.


3. MIXING - This is where the audio comes to life. Clarity is added to the audio and annoying frequencies are carefully controlled. There are hundreds of plugins, and couple of software which can do this job amazingly. But it can get overwhelming for beginners while mixing their audio. There are typically a few processes which can enhance the audio -

Plugin Chain of an audiobook
This is how my plugin chain looked in a recent project.

  • Equalizer (EQ)

  • Gate

  • Compression

  • De-esser

  • Gain Staging

  • Levelling


It requires a good amount of experience and expertise to use these plugins flawlessly. Each audio type is different, and each speaker is also different. To use what and when, and the requirements of your clients totally affect your plugin choices. Even the plugins can be same, but their order can be different.

Plugins working during the audiobook mixing
Plugins

4. MASTERING - This process decides whether your audio will be accepted on the streaming platform or not. Each platform has different requirements. These are the requirements for audible - ACX Requirements


In a nutshell, this process controls the loudness of your audio and its peaks, so it doesn't sound too loud or too quiet. It also controls sudden jump of audio and trims them down.


Before and After of a Mastered audio
Mastered audio
A meter displaying audio levels
Audio Meter

Tip 💡: In FL Studio, Export all playlist tracks/groups from song start.


Use an audio meter of your choice to check the levels of your audio and check if its meeting the requirements of your streaming platform. If not, then make adjustments in the Limiter Plugin of your choice.



This whole process can be simple and complex at the same time. That also depends on the client and his working process. At the end of the day, you have to make things easier for them because that's what you're being paid for.



UPLOADING ON ACX


Uploading your audiobook can be a challenging task. Meeting many smaller requirements can be an annoying experience. There are certain requirements that need to be met -

  • Leaving a 2.5 sec blank space at the start and end of your file

  • Creating a retail sample

  • Opening and Closing credits

  • Associating Chapters and uploading files

  • RMS, True Peak, Imaging, Noise floor as per ACX



Additional Audios for ACX: We need to record 2 audios for ACX


  1. Opening Credits: Welcome to "Book title" written and narrated by "author and narrator name".

  2. Closing Credits: Thank you for listening to "Book Title" written and narrated by "author and narrator name"

  3. Retail Sample: You don't have to record this. Just choose a 5 min RETAIL SAMPLE which will be the DEMO PLAYBACK for your audiobook on audible. This can be your Intro, Prologue, or any chapter (from beginning or anywhere).


(These are the basic versions, and you can slightly modify accordingly.)


After submitting your audiobook, It takes almost 10 days for -

  1. Metadata Review

  2. Audio Review

  3. Cover Art Review

  4. Final Verification

Additional File Format Option: Convert all your chapters into one single file with all the information embedded into it using .m4b (MPEG-4 Audio Book) file format. This works great if you're selling books through personal means. Apps like Sirin Audiobook Player for Android and BookPlayer for iOS works great with .m4b files. Currently .m4b files support only 13.5 hours of playback.


  ⚠️ NOTE: Audiobooks produced using 'Text To Speech' are not accepted by Audible. Your submitted audiobook must be narrated by a human. Unauthorized use of text-to-speech, AI, or automated recordings in ACX titles is prohibited. See Requirements.


And now, your Audiobook is done. Below are some of the reviews I've got recently for my excellent work on audiobooks.

 

Reviews


Rocio T.'s - Feedback of my biggest audiobook project

Do comment ⭐


Thanks,

Aman Dembla

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