On a live audio interface, the “Side Chain” function (also known as “Audio Ducking”) is a highly practical audio processing technique. Its core purpose is to automatically lower the background music volume when the host speaks, and restore it once the speaking stops, ensuring that the host’s voice remains clear and prominent while maintaining the live atmosphere.

How the Side Chain Function Works

When the host starts speaking into the microphone:

The interface detects the microphone input (the voice signal).
The system automatically reduces the background music volume (typically by 5–15dB).
The voice becomes clear and dominant without being masked by the music.
When the host stops speaking (no microphone input detected),
The system automatically restores the background music to its normal level.

Practical Scenarios for Side Chain Application

Improving Voice Clarity During Live Streams:
- In game streaming, educational, or commentary sessions, the background or in-game music is automatically lowered when the host speaks.
- This allows the audience to hear the host clearly, improving the overall broadcast quality.
Enhanced Karaoke Live Streaming Experience:
- When the host starts singing, the background music automatically ducks in volume.
- When the singing stops, the background music returns to normal.
- No need for manual volume adjustments—everything runs smoothly and naturally.

Why the Side Chain Function Matters for Streamers

Prevents Sound Interference: Keeps the host’s voice clear and unmasked by background tracks.
Enhances Audience Experience: Makes the live content easier to follow, increasing viewer engagement.
Simplifies Operation: Eliminates the need for frequent manual volume adjustments.
Adds Professionalism: Creates a more polished and broadcast-quality sound, distinguishing professional streams from amateur ones.

The Side Chain function is a powerful assistant for streamers. During a live broadcast, when the host speaks, the background music automatically fades down to highlight the voice. Once the host pauses or stops talking, the background music gradually returns, creating a smooth, natural, and balanced sound atmosphere throughout the stream.

Audio Interfaces 101: Your Complete Guide to Getti