How it works
From manuscriptto finished audiobook.
Five stages take one book from manuscript to a finished audiobook. Each is shown here with the real record of a novel that went through them: its words, its cast, a directed line, the quality checks and the package it shipped as.
Production record · Poison Chairs, chapter one
- 13,759words in
- 2138lines cast
- 36voices
- 424.1 minfinished audio
- 51retail package
Measured from the book’s production on October 3, 2026. Used with the author’s permission.
- 1Stage 1 of 5 · Prepare manuscript
Upload the book. Get a straight answer.
Marvox reads the manuscript the way an editor would: chapters, who speaks every line, the names that need a pronunciation, and how long the finished audio will run. That’s the free Book Check, with an early chapter of your own book in full cast (up to 6,000 words).
- Chapters
- 1
- Words
- 3,759
- Speaking characters
- 6
- Lines, each with a speaker
- 138
- Estimated length
- ≈ 25.1 min
The estimate is words ÷ 150 a minute. The finished chapter ran 24.1 minutes. - 2Stage 2 of 5 · Build & approve cast
A voice for every character.
Each speaking character is matched to a distinct voice from what the book says about them. You hear the cast before anything is produced, change any voice you like, and approve it.
Hear this cast performNathan
The father, and the book’s first-person narrator
Adam41 lines
Crystal
His wife, holding the family together
Bella15 lines
Dr. Galveston
The pediatric oncologist
Bill10 lines
Staff member
A teenage staff member on the ward
Jessica5 lines
Nurse White
The oncology ward’s nurse
Matilda5 lines
David
Their son, in a birthday memory
Brian4 lines
Cast by Marvox from the manuscript. Nathan tells the story in the first person, so his voice carries the narration too. - 3Stage 3 of 5 · Direct scenes & pronunciations
Direct any line in plain words.
Tell a character how to read a line (“barely a whisper”) and hear the retake in the same voice. Keep it and only that line changes. Pronunciations you set hold across the whole book.
More on the Director“Just tell me my David isn’t dying!”
Pick a note
“barely a whisper, holding back tears”
Nothing changes until you keep a take.
Poison Chairs, chapter one. Real takes from Marvox’s Director, rendered October 4, 2026. AI-narrated.
- 4Stage 4 of 5 · Review audio & corrections
Every chapter is measured before it ships.
Listen chapter by chapter with the cast visible and fix what you hear. Marvox measures the audio against ACX’s technical spec, the benchmark audiobook stores use. Anything that fails is named, with the number that failed.
Measured on every chapter · ACX’s technical audio spec
Loudness. RMS between −23 and −18 dB
Peaks. No peak above −3 dB
Noise floor. At or below −60 dB
Room tone. 0.5–1 s at the head, 1–5 s at the tail
No dropouts. No silence inside a chapter longer than 3.5 s
Each chapter’s numbers go into qc_report.md in your package. If any chapter fails, Marvox won’t build the package until it’s fixed. - 5Stage 5 of 5 · Package for publishing
A finished audiobook, in one download.
When every chapter passes, Marvox builds the package: the chapter files, your cover, the cast sheet, pronunciations, the quality report and a checklist for publishing it yourself.
See pricingpoison-chairs_retail.zip
- audio/
- 01_chapter-one.mp3
- cover.jpg
- cast_summary.md
- pronunciations.json
- qc_report.md
- publishing_checklist.md
- manifest.json
You submit to the stores yourself. The files are yours; Marvox takes no royalty and needs no exclusivity.
Start with your own book.
The free Book Check reads your manuscript, casts it, and produces an early chapter in full cast before you spend anything.