Audiobook

Steps

Each chapter narrates independently, so you can re-record one without redoing the rest.

1. Inside your book, click the Audiobook tab.
2. Pick a voice from the list. Play samples first to compare.
3. Click Generate on each chapter to create the narration.
4. Listen in-app. Re-record any chapter that did not land right.
5. Download when you are happy with the full book.

Where to pick a voice

Open the Generate Audiobook dialog (from a book card 3-dot menu or the Audiobook button in the editor). The voice picker is right inside, with every narrator listed in a two-column grid.

Preview before you generate

Each voice row has a play icon on the left. Click it to hear a sample so you can compare tones before committing. The currently-selected voice is highlighted.

Narrow the list

A row of filter pills sits above the grid: Male / Female on the left, then US / British / Australian on the right. Click any pill to filter; click it again to clear. Filters stack, so picking "Male" + "British" narrows the grid to Brian and Arthur. Hit "Clear" on the right to reset everything.

How to read the voice tags

Each voice has a short descriptor next to its name (e.g. Expressive, Bright, Warm, Calm) and an engine label in parentheses (Neural or Generative). The descriptor hints at the tone of the voice; the accent is set by the filter pills above the grid.

Neural vs Generative

Neural voices (the default, "Joey") sound clear and natural, and render quickly. Generative voices sound warmer and more expressive, closer to a human narrator, but take slightly longer to render. Try one of each on a sample if you are not sure which suits your tone.

Changing voice after recording

You can switch voices anytime: from the recorded audiobook view, click "Re-record in different voice". You can re-record the whole book or just specific chapters in the new voice.

Steps

The new recording replaces the previous one for the chapters you selected. Chapters you did not select keep their existing audio.

1. Open the Generate Audiobook dialog from your book.
2. Click Re-record in different voice (below the playback controls).
3. In the Re-record dialog, pick the new narrator voice. The picker shows your current voice for reference.
4. Optional: expand "Chapters to record" if you only want to refresh specific chapters instead of the whole book. By default, all chapters are selected.
5. Click Re-record in [Voice Name] to confirm. The credit cost is shown above the button.

When to use this

Common reasons to re-record:

• You changed your mind on the narrator voice after listening to the first cut
• You edited a chapter's text and want the audio to match
• You want to A/B test two voices on a sample chapter before committing
• You need to re-encode for ACX submission (use Re-encode in the ACX panel instead, see the ACX article)

Steps

1. Open the Generate Audiobook dialog from your book.
2. Make sure every chapter you want in the final file has been recorded.
3. Click Download MP3 to get the whole book as a single MP3.
4. Or click the download icon on a chapter row to grab just that chapter.

Submitting to ACX or Audible?

Audible has stricter audio specs than the standard MP3 download (44.1 kHz, 192 kbps CBR mono, loudness-normalized). For that flow, use the ACX export instead: see the dedicated article linked below.

Why ACX needs its own export

ACX (the platform that distributes audiobooks to Audible) rejects files that do not meet its audio QC: 44.1 kHz sample rate, 192 kbps CBR mono, RMS loudness between -23 and -18 dBFS, peak no higher than -3 dBFS, and one MP3 per chapter (no merged single file). The standard MP3 download is optimized for streaming and personal listening, not ACX QC.

The ACX export re-encodes your generated narration to those exact specs and packages it as a zip with one MP3 per chapter, named in reading order, ready to upload to ACX directly.

Steps

1. Generate your audiobook normally and wait for all chapters to be ready.
2. In the audiobook dialog, expand the "Submitting to ACX or Audible?" panel.
3. Click Download ACX chapters (.zip). The encode runs in the background.
4. You will get a notification when the zip is ready. Download it.
5. Sign in to acx.com and upload each MP3 in order on your title page.

If you re-record

Re-recording a chapter or switching voices invalidates the existing ACX zip. The panel will show a Re-encode option so you can refresh the zip without re-recording from scratch.