Aggregate Device volume slider permanently broken after installing Background Music

[EvgeniiZaets]

Description of the bug

After installing Background Music, the volume slider for my Aggregate Device became permanently disabled (greyed out and not adjustable). I can no longer control the volume of the aggregate output.

Uninstalling Background Music using the provided uninstall.sh script did not fix the issue. The script reported successful removal, but the Aggregate Device volume control remains broken.

Steps to reproduce

1. Install Background Music (v0.4.3)
2. Use an Aggregate Device as output (in my case: MacBook Pro Speakers + External Headphones)
3. Observe that the system volume slider for the Aggregate Device becomes disabled
4. Uninstall Background Music using uninstall.sh
5. Volume control for the Aggregate Device is still not restored

Versions

• Background Music: 0.4.3
• macOS: Tahoe 26.3.1

Hardware

• Computer: MacBook Pro (M3 Pro)
• Audio Device: Aggregate Device (MacBook Pro Speakers + External Headphones)

Debug logs

Don't know if this log is relevant, because i got it after reinstalling the app.
2026-03-22 09:44:59.478020+0100 0x119f82 Default 0x0 15446 0 coreaudiod: (libAudioIssueDetector.dylib) [com.apple.coreaudio:aid] IssueReporting.cpp:492 RTAID [ use_case=Generic report_type=RMS Generic Chain clientID=HAL node=-Output issue_detected_sample_time=1534252.000000 ] -- [ rms:[-120.000000], peaks:[-240.000000] ]

Other info

I have tried the following without success:

• Rebooting macOS
• Deleting and recreating the Aggregate Device
• Running sudo killall coreaudiod
• Deleting:
  • com.apple.audio.DeviceSettings.plist
  • com.apple.audio.SystemSettings.plist
  • com.apple.audio.AudioMIDISetup.plist

The issue started immediately after installing Background Music.
Normal (non-aggregate) output devices still have working volume control.

Screenshots of sound settings and of Aggregate Device configuration attached.