You join a Zoom call. Spotify was playing at a comfortable volume. The call connects and — your music vanishes or drops to almost nothing. You didn't touch anything. Zoom (or macOS) decided to lower your music for you, without asking.
This drives people crazy because it's invisible and automatic. You didn't mute anything. You didn't adjust a slider. Something in the system decided your music should be quieter, and you have no obvious way to control it.
Here's what's actually happening and how to take back control.
Why your music gets quieter during Zoom calls
There are two possible causes:
1. Zoom's built-in audio ducking
Zoom has its own audio processing that can affect other audio on your system. In some configurations, Zoom reduces system audio when it activates your microphone, so the call audio is clearer. This isn't always obvious in Zoom's settings.
Check Zoom → Settings → Audio:
- Look for any "Automatically adjust microphone volume" setting and try disabling it
- Check "Suppress background noise" — this processes audio and can affect perceived volume
- Make sure "Use separate audio device for simultaneous interpretation" is unchecked unless you need it
2. macOS codec switching
When Zoom activates your microphone (especially with Bluetooth headphones like AirPods), macOS switches from the high-quality AAC audio codec to the lower-quality SCO codec. This codec change often reduces overall audio volume and quality. It's not Zoom's fault specifically — it happens with any app that uses the microphone over Bluetooth.
If you're using AirPods or other Bluetooth headphones and the volume drops when a call starts, this is likely the cause.
Built-in fixes
Use wired headphones
The Bluetooth codec switching issue disappears entirely with wired headphones. A USB-C headphone adapter or a headset with a built-in microphone avoids the AAC→SCO switch completely. Audio quality stays consistent before, during, and after calls.
Use a separate microphone
If you use your Mac's built-in microphone (or an external USB mic) instead of your AirPods' microphone, macOS doesn't need to switch the Bluetooth codec. Set your input device to the built-in mic in System Settings → Sound → Input, while keeping AirPods as your output. This way AirPods stay in AAC mode and volume is unaffected.
Adjust Zoom's audio settings
In Zoom → Settings → Audio, experiment with disabling automatic microphone adjustment and background noise suppression. These features can interfere with other apps' audio levels.
The real fix: auto-ducking on your terms
The fundamental problem is that you have no control over how much your music is lowered during calls. The system makes that decision for you, and it's usually too aggressive — music drops to nearly zero instead of a comfortable background level.
What you actually want is configurable auto-ducking: "when I'm on a call, lower my music to 25% — not zero, not 50%, exactly 25%."
SoundDial gives you exactly this. Its auto-ducking feature monitors your microphone and automatically adjusts background audio when a call starts — but you control the duck level.
How it works
- You set your preferred duck level (10% to 80%)
- You join a Zoom call — your microphone activates
- SoundDial detects the call and lowers background apps to your configured level
- Your call audio stays at full volume
- You hang up — all apps return to their previous volume
The difference from the Zoom/macOS approach:
- You choose the level. 30% is a good default — music is audible but doesn't interfere. You can adjust anywhere from 10% (nearly silent) to 80% (barely reduced).
- It restores perfectly. When the call ends, every app comes back to exactly where it was.
- It works with all communication apps. Zoom, Teams, FaceTime, Discord, Slack, Google Meet, Webex, Skype.
- You can disable it. If you want to manage volume manually for a specific call, just turn off auto-ducking in SoundDial's settings.
Get SoundDial on the Mac App Store — €14.99 one-time purchase, no subscription, macOS 14.2+.