Blog
Product updates, guides, and engineering notes from the team.

Sub-50ms TTS: What It Means for AI Audiobook Generators
Explore how sub-50ms text-to-speech latency transforms ebook to audiobook workflows. Learn why speed matters for multi-voice narration and character casting.

Speko Routes Voice Models. Audiobooks Still Need a Studio
YC S26 Speko is OpenRouter for STT, LLM, and TTS. For ebook-to-audiobook work, a router picks providers; it does not cast characters or pass ACX checks.

Audiobook Narration Pacing: A Scene-by-Scene Guide
Direct audiobook pace with meaning, syntax, pauses, character contrast, scene energy, and repeatable listening tests instead of one target speed.

How to Prepare an EPUB for Audiobook Production
Audit an EPUB's reading order, navigation, headings, dialogue, images, notes, and hidden text before turning it into a narration script.

Audiobook Quality Control Checklist: From Script to Master
Run a repeatable audiobook QC pass for text accuracy, speaker continuity, pronunciation, edits, audio defects, chapters, and final delivery.

Audiobook Chapter Files and Metadata: A Delivery Guide
Split, name, order, and verify audiobook chapter files, credits, samples, and metadata with a manifest that survives distribution.

ACX Audio Submission Requirements: A Practical Preflight
Check chapter structure, credits, peaks, RMS, noise floor, room tone, sample length, MP3 encoding, and file naming before an ACX upload.

How to Format Dialogue for Audiobook Narration
Prepare dialogue for narration by resolving speakers, interruptions, thoughts, messages, nested quotations, and performance notes before recording.

How to Build an Audiobook Pronunciation Guide
Create a usable pronunciation guide for names, places, technical terms, invented words, and multilingual passages without slowing production.

Audiobook Character Voice Casting: A Practical System
Build a consistent audiobook cast with a character inventory, voice brief, audition script, contrast checks, and a continuity ledger.