Audiobook mastering without the manual processing chain
Optivox is automated audiobook mastering software for narrators who want professional cleanup and ACX-oriented mastering without building a manual processing chain. Upload a chapter, choose audiobook mode, and get back a cleaned, levelled and mastered file aimed at audiobook delivery requirements. The performance stays exactly as you recorded it.
New accounts get 60 minutes free. No card needed.
From around $3.75–$5 per finished hour. No subscription. See pricing
Spend less time on technical post-production
Narrating is only part of the job. Once the chapter is recorded there is still noise to deal with, levels to even out, room sound to tame and a mastering pass to run before the file meets delivery requirements. For a full-length book that work repeats chapter after chapter, and it is the same handful of technical moves every time.
Optivox runs that technical pass for you. You keep the editing and the performance decisions; the repetitive processing stops being your problem.
What Optivox does to audiobook narration
- Background noise reduction, scaled to what is actually in the recording.
- Reverb and room-sound reduction.
- Tonal balance, so the voice sits evenly instead of boomy or thin.
- Unwanted-noise cleanup such as clicks, where the material allows it.
- Level control across the chapter, so quiet passages do not disappear.
- A mastering pass with controlled peak levels.
- Optional breath reduction, at a strength you choose.
- Finished WAV or MP3 output.
Cleanup and mastering in one pass
Some audiobook tools focus mainly on checking or normalising loudness, peaks and noise floor. Optivox also handles the cleanup that comes before delivery, including noise, room sound, tonal balance, unwanted clicks, levelling and optional breath reduction, before mastering towards audiobook targets.
Consistent processing across every chapter
Audiobooks are often recorded over days or weeks, so mic position, room sound and vocal level can drift. Running every finished chapter through the same audiobook workflow helps keep tonal balance, levels and mastering more consistent across the full book.
Built around audiobook delivery requirements
Three of the core audio measurements ACX checks are RMS loudness, peak level and noise floor. They interact, which is what makes them fiddly to hit by hand. Audiobook mode targets that technical window rather than a generic podcast loudness target, which is why running narration through the general mode often reads as too quiet for submission.
The full detail is in our guide to ACX audio requirements.
Technical compliance is not the same thing as acceptance. Misreads, pacing, take selection and matching the manuscript are editorial matters, and they stay with you and your proofer.
Keep control of the performance
Optivox automates repetitive technical processing. It does not rewrite a performance, change your delivery or make editorial choices on your behalf. Nothing is synthesised and no voice is cloned. What comes back is your recording, cleaned up.
From raw chapter to finished master
- Record and edit your narration as usual.
- Upload the chapter.
- Choose the audiobook mode.
- Let it process, usually a few minutes.
- Compare the original against the master.
- Download the WAV or MP3.
The how it works page walks through each stage in more detail.
Confidential narration stays confidential
Plenty of narration work sits under NDA. We do not train models on your audio, we do not clone voices, uploads are deleted after processing and finished files are removed after the retention period. Read our confidentiality commitments.
Learn more about audiobook production
Audiobook mastering FAQs
What is audiobook mastering?
Audiobook mastering is the final technical stage after the narration has been recorded, edited and proofed. It brings levels, tonal balance, peaks and noise into a consistent delivery range so the finished chapters behave like one complete audiobook.
What's the difference between audiobook editing and mastering?
Editing deals with the performance itself: misreads, repeated takes, pacing, gaps and unwanted sections. Mastering deals with the sound of the finished edit: noise, tonal balance, levels, peaks and delivery loudness. Optivox focuses on the technical processing rather than making editorial decisions for you.
Can Optivox remove mouth clicks from audiobook narration?
Optivox can reduce unwanted sounds such as mouth clicks where the recording allows it. Not every click can be removed cleanly, and severe noises may still need a manual edit, but routine cleanup can be handled as part of the automated processing pass.
Can Optivox help an audiobook meet ACX requirements?
Audiobook mode is designed around ACX-style technical targets for RMS loudness, peak level and noise floor. It can prepare the audio towards that technical window, but technical compliance is only one part of audiobook acceptance. Misreads, pacing, manuscript accuracy, file requirements and other editorial checks still matter. See our guide to ACX requirements.
Do I still need to edit and proof my audiobook?
Yes. Optivox is designed to automate repetitive audio post-production, not manuscript checking or performance editing. Edit the narration and choose the takes you want first, then use Optivox for the technical cleanup and mastering pass.
Can I use the same process across every audiobook chapter?
Yes. That repeatability is one of the main reasons to automate the technical pass. Each chapter can go through the same audiobook workflow so noise reduction, tonal balance, level control and mastering are handled consistently across a long project.