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Audio Mixing & Mastering
Mix voice, binaural, and SFX stems into final master
SKILL.md
Full skill instructions
Audio Mixing Skill
The Mix Is Where Magic Happens
This skill handles combining voice, binaural beats, and sound effects into a cohesive, hypnotic audio experience.
Purpose
Mix multiple audio stems at correct levels and apply hypnotic post-processing for production masters.
Standard Stem Levels
CRITICAL: Always use these exact levels.
| Stem | Level | Rationale |
|---|---|---|
| Voice | -6 dB | Reference level, prevents clipping |
| Binaural | -6 dB | Audible but not distracting |
| SFX | 0 dB | Full impact for transitions |
Canonical Mix Command
ffmpeg -y \
-i sessions/{session}/output/voice_enhanced.wav \
-i sessions/{session}/output/binaural_dynamic.wav \
-i sessions/{session}/output/sfx_track.wav \
-filter_complex \
"[0:a]volume=-6dB[voice]; \
[1:a]volume=-6dB[bin]; \
[2:a]volume=0dB[sfx]; \
[voice][bin][sfx]amix=inputs=3:duration=longest:normalize=0[mixed]" \
-map "[mixed]" \
-acodec pcm_s16le \
sessions/{session}/output/session_mixed.wav
Important: Use normalize=0 to prevent unpredictable level changes.
Input Stems
| Stem | File | Required |
|---|---|---|
| Voice | voice_enhanced.wav | Yes |
| Binaural | binaural_dynamic.wav | Yes |
| SFX | sfx_track.wav | Optional |
Never use voice.mp3 - always use the enhanced version.
Hypnotic Post-Processing (MANDATORY)
After mixing, apply psychoacoustic mastering:
python3 scripts/core/hypnotic_post_process.py --session sessions/{session}/
Triple-Layer Hypnotic Presence
| Layer | Enhancement | Level | Effect |
|---|---|---|---|
| 1 | Whisper Overlay | -22 dB | Ethereal presence |
| 2 | Subharmonic | -12 dB | Grounding presence |
| 3 | Double-Voice | -14 dB, 8ms delay | Subliminal presence |
Additional Enhancements
| Enhancement | Description | Default |
|---|---|---|
| Tape Warmth | Analog saturation | 25% drive |
| De-essing | Sibilance reduction | 4-8 kHz |
| Room Tone | Gentle reverb | 4% wet |
| Cuddle Waves | Amplitude modulation | 0.05 Hz, ±1.5 dB |
| Echo | Subtle depth | 180ms, 25% decay |
Output Files
| File | Purpose |
|---|---|
session_mixed.wav | Pre-master mix (intermediate) |
{session}_MASTER.mp3 | Final deliverable (320 kbps) |
{session}_MASTER.wav | Archive master (24-bit) |
Two-Stem Mix (No SFX)
When no SFX track is needed:
ffmpeg -y \
-i sessions/{session}/output/voice_enhanced.wav \
-i sessions/{session}/output/binaural_dynamic.wav \
-filter_complex \
"[0:a]volume=-6dB[voice]; \
[1:a]volume=-6dB[bin]; \
[voice][bin]amix=inputs=2:duration=longest:normalize=0[mixed]" \
-map "[mixed]" \
-acodec pcm_s16le \
sessions/{session}/output/session_mixed.wav
Level Verification
After mixing, check levels:
# Check peak level (should be < 0 dB)
ffmpeg -i session_mixed.wav -af "volumedetect" -f null /dev/null 2>&1 | grep max_volume
# Check LUFS (target: -14 LUFS)
ffmpeg -i session_mixed.wav -af "loudnorm=print_format=json" -f null /dev/null 2>&1
Target Levels
| Metric | Target | Acceptable Range |
|---|---|---|
| Integrated LUFS | -14 LUFS | -16 to -12 LUFS |
| True Peak | -1.5 dBTP | < -1.0 dBTP |
| Peak | -3 dB | < 0 dB |
Binaural Beat Standards
| Brainwave State | Frequency Range | Use For |
|---|---|---|
| Beta | 13-30 Hz | Alert, focused |
| Alpha | 8-12 Hz | Relaxed, light trance |
| Theta | 4-7 Hz | Deep trance, meditation |
| Delta | 0.5-3 Hz | Very deep, sleep-adjacent |
Typical Journey Curve
0:00 - Alpha (10 Hz) - Induction
5:00 - Theta (7 Hz) - Deepening
15:00 - Deep Theta (4 Hz) - Journey core
25:00 - Theta (7 Hz) - Integration
28:00 - Alpha (10 Hz) - Emergence
Troubleshooting
| Issue | Cause | Solution |
|---|---|---|
| Clipping/distortion | Levels too hot | Check stem levels, use -6 dB |
| Binaural inaudible | Level too low | Should be -6 dB (not -12 dB) |
| Voice buried | Binaural too loud | Verify -6 dB on binaural |
| Muddy mix | Sample rate mismatch | All stems same rate (44100 or 48000) |
| SFX too harsh | Level too high | Try -3 dB for gentler SFX |
| Silent output | normalize=1 issue | Use normalize=0 in amix |
Quality Checklist
Before video assembly:
-
{session}_MASTER.mp3exists - No clipping or distortion
- Binaural beats audible but not intrusive
- Voice clear and present
- SFX properly timed (if used)
- LUFS within target range
- Duration matches expected
Integration with Pipeline
Before (dependencies):
- Voice synthesis complete (
voice_enhanced.wav) - Binaural generated (
binaural_dynamic.wav) - SFX track if needed (
sfx_track.wav)
After (next steps):
- Video assembly
- YouTube packaging
Related Resources
- Skill:
tier3-production/voice-synthesis/(input) - Skill:
tier3-production/video-assembly/(next step) - Serena Memory:
audio_production_methodology - Script:
scripts/core/hypnotic_post_process.py
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