Audio Ducking Mixer
for Video  —  Notebook Edition  —  Web Audio API
Research Lab
Single‑file build
v2.1 — fixed
§ 01 — Voiceover Track
🎙️
Drop or Click — Voice / Narration
WAV · MP3 · OGG · M4A · FLAC
→ Sidechain trigger signal — drives ducking envelope
VOICE
−∞ dB
§ 02 — Background Music Track
🎵
Drop or Click — Background Music
WAV · MP3 · OGG · M4A · FLAC
→ Ducked track — gain reduced when voice is active
MUSIC
−∞ dB

§ 03 — Volume Mix
100%
80%
→ Gain multipliers applied before ducking
§ 04 — Sidechain Ducking Engine
−18 dB
−30 dB
30 ms
600 ms
3.0 s
→ RMS amplitude analysis → pre-computed GainNode automation

§ 05 — Preview & Export Engine
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§ 06 — System Console [real-time log]