audiobook-production

What this skill does

# Audiobook Production

> Master ACX-compliant audiobook production using Audible's technical standards and Richard Mayer's multimedia learning principles for engaging, professional audio.

## When to Use This Skill

- Producing an audiobook for Audible/ACX distribution
- Creating audio versions of courses or written content
- Setting up narration workflow for long-form content
- Ensuring audio meets professional distribution standards
- Self-producing an audiobook as an author
- Managing audiobook production projects

## Methodology Foundation

**Source**: ACX (Audiobook Creation Exchange) + Richard Mayer (Multimedia Learning)

**Core Principle**: Professional audiobook production balances technical excellence (meeting strict ACX standards) with engaging delivery (applying learning science principles). As Mayer's research shows: "People learn better from friendly human voice than machine voice" (Voice Principle).

**Why This Matters**: ACX/Audible rejects audiobooks that don't meet technical specifications, wasting production time and money. Beyond technical compliance, understanding how listeners process audio enables production choices that maximize engagement and retention.


## What Claude Does vs What You Decide

| Claude Does | You Decide |
|-------------|------------|
| Structures production workflow | Final creative direction |
| Suggests technical approaches | Equipment and tool choices |
| Creates templates and checklists | Quality standards |
| Identifies best practices | Brand/voice decisions |
| Generates script outlines | Final script approval |

## What This Skill Does

1. **Ensures ACX technical compliance** - Specs for bit rate, sample rate, RMS, peaks, and noise floor
2. **Structures audiobook projects** - Chapter organization, credits, retail samples
3. **Applies learning principles** - Pacing, tone, and delivery that aid comprehension
4. **Manages production workflow** - From script to final master
5. **Handles proofing and QC** - Catching errors before submission

## How to Use

### Check ACX Compliance
```
Help me verify this audiobook meets ACX submission requirements.
[provide audio specs or describe setup]
```

### Plan Audiobook Structure
```
Help me structure an audiobook from this manuscript:
Total word count: [X]
Chapters: [Y]
Type: [Fiction/Non-fiction]
```

### Create Production Workflow
```
Create a production plan for my audiobook project:
Book length: [word count]
Narrator: [self/hired]
Deadline: [date]
```

## Instructions

When producing audiobooks, follow this methodology:

### Step 1: Understand ACX Technical Requirements

ACX has strict specifications that must be met for acceptance.

```
## ACX Audio Specifications (2026)

### File Format
- MP3, 192 kbps or higher (constant bit rate)
- 44.1 kHz sample rate
- Mono (single channel)

### Audio Levels
- RMS: -23dB to -18dB
- Peak values: -3dB maximum (no clipping)
- Noise floor: -60dB or lower

### File Naming
- Chapter files: [BookTitle]_[ChapterNumber].mp3
- Opening credits: [BookTitle]_Opening_Credits.mp3
- Closing credits: [BookTitle]_Closing_Credits.mp3

### Content Requirements
- Opening credits (first file): Title, author, narrator
- Closing credits (last file): "This has been [title] by [author], narrated by [narrator]"
- Each chapter file is standalone (no cross-file audio)
- Consistent room tone throughout

### Quality Requirements
- No extraneous sounds (mouth clicks, pops, page turns)
- Consistent audio quality across all files
- Retail sample: ~5 minutes of representative content
```

**Critical**: Run ACX Check tool on every file before submission.

---

### Step 2: Prepare the Manuscript

Before recording, optimize the text for audio delivery.

```
## Manuscript Preparation Checklist

### Structure
□ Chapter breaks clearly marked
□ Section breaks identified (longer pause points)
□ Footnotes converted to in-text explanations or removed
□ Visual content (charts, tables) adapted for audio or noted for skip

### Pronunciation Guide
□ Character names with phonetic spelling
□ Foreign words and phrases
□ Technical terms and jargon
□ Place names and proper nouns
□ Acronyms expanded or spelled out

### Narrator Notes
□ Tone shifts marked
□ Character voice cues (if fiction)
□ Emphasis suggestions (minimal)
□ "As shown in Figure X" → adapted for audio
□ Author asides or commentary identified

### Timing Estimate
□ Word count per chapter
□ Total word count
□ Estimated runtime: words ÷ 9,300 = hours (approx)
   - 50,000 words ≈ 5-6 hours
   - 80,000 words ≈ 8-9 hours
```

---

### Step 3: Set Up Recording Environment

Consistent, quality recording requires proper setup.

```
## Home Studio Essentials

### Minimum Equipment
- **Microphone**: USB condenser (AT2020, Blue Yeti) or XLR setup
- **Pop filter**: Essential for plosives
- **Mic stand**: Stable positioning
- **Headphones**: Closed-back, wired

### Room Treatment
- Record in smallest, most furnished room available
- Hang blankets on hard surfaces
- Use reflection filter behind mic
- Close windows, turn off HVAC
- Eliminate electronic hum (fridges, computers)

### Recording Software (DAW)
- Free: Audacity, GarageBand
- Professional: Adobe Audition, Reaper, Pro Tools
- ACX-specific: Hindenburg Pro (audiobook workflow)

### Test Recording Checklist
□ Record 30 seconds of room tone
□ Record test passage
□ Check RMS levels (-23 to -18 dB)
□ Check peak levels (below -3 dB)
□ Check noise floor (below -60 dB)
□ Listen for room echo or hum
□ Verify consistent mic positioning
```

---

### Step 4: Apply Mayer's Multimedia Learning Principles

Science-backed techniques for engaging audio.

```
## Mayer's Principles for Audiobook Delivery

### Voice Principle
"People learn better from human voice than machine voice."
→ Warm, conversational delivery beats polished broadcast voice
→ Let personality come through
→ Avoid monotone "reading" voice

### Personalization Principle
"People learn better when words are conversational rather than formal."
→ Write/deliver as if talking to one person
→ Use "you" and "we"
→ Contractions are encouraged

### Segmenting Principle
"People learn better when content is in learner-paced segments."
→ Clear chapter breaks
→ Section pauses for complex material
→ Chapter summaries for dense non-fiction

### Redundancy Principle (for video/slides)
"People learn better from graphics and narration than graphics + narration + text."
→ For audiobooks: don't describe visual elements you can't show
→ Adapt visual content or acknowledge it's omitted

### Coherence Principle
"People learn better when extraneous material is excluded."
→ Cut verbal filler
→ Remove tangents that don't serve the chapter
→ Every word earns its place
```

---

### Step 5: Production Workflow

Systematic process from script to master.

```
## Audiobook Production Pipeline

### Phase 1: Pre-Production (Week 1-2)
□ Manuscript finalized and proofread
□ Pronunciation guide complete
□ Chapter structure confirmed
□ Recording schedule created
□ Test recordings approved

### Phase 2: Recording (Weeks 2-6, varies by length)
□ Opening credits recorded first
□ Chapters recorded in order (usually)
□ Room tone captured each session
□ Daily backup of raw files
□ Notes logged for pickups needed

### Phase 3: Editing (Concurrent or following)
□ Remove mistakes and restart takes
□ Remove excessive breaths (keep natural ones)
□ Eliminate mouth clicks and pops
□ Smooth edits (crossfade)
□ Consistent pacing throughout

### Phase 4: Mastering
□ Noise reduction applied (light touch)
□ Compression for consistent levels
□ Limiting to prevent peaks
□ Final RMS check (-23 to -18 dB)
□ Export to ACX specs (192 kbps MP3, 44.1kHz, mono)

### Phase 5: Quality Control
□ Listen to every file start to finish
□ Check first/last 5 seconds of each file
□ Verify file naming convention
□ Run ACX Check or similar tool
□ Create retail sample (5 min)
```

---

### Step 6: Credits and Sample

Specific requirements for opening, closing, and retail sample.

```
## Ope