VolumeSync is a native macOS application designed to solve the volume control limitation of Aggregate Devices.
By default, when you combine multiple speakers in macOS (e.g., two Bluetooth speakers or a USB + Bluetooth setup), the system disables volume control. VolumeSync restores that control.
- ⚡️ Virtual Master Control: Increase and decrease volume for all devices in the group simultaneously using your standard volume keys.
- 🎚️ Independent Control: Adjust balance individually. For example, set the left speaker to 30% and the right one to 80%.
- 🧠 Relative Adjustment: When using volume keys, the app respects the volume offset between your devices (if one is lower than the other, both will rise but keep that ratio).
- 🖥️ Native OSD: Displays the classic macOS volume visual HUD on screen so you always know the current level.
- 🍎 100% Native: Written in Swift and SwiftUI, lightweight, and designed following Apple's Human Interface Guidelines.
- macOS 14 (Sonoma) or newer.
- Xcode 15+ (if compiling from source).
-
Clone the repository:
git clone https://github.com/your-username/volumesync.git cd volumesync -
Build and Run:
swift run
Or open
Package.swiftin Xcode and hit Play.
For the app to intercept volume keys (F11/F12 or dedicated media keys), you need to grant Accessibility permission:
- When opening the app for the first time, macOS should ask for permissions.
- If not, go to System Settings > Privacy & Security > Accessibility.
- Add your Terminal (if running via
swift run) or theVolumeSyncapp to the list and enable it.
- Open Audio MIDI Setup on your Mac and create your Aggregate Device (or Multi-Output Device).
- Open VolumeSync. You will see a speaker icon in the menu bar.
- Click it and select your aggregate device from the list.
- Done! You can now use your keyboard volume keys.
- If you want to adjust each speaker separately, open the menu and use the individual sliders.
Made with Swift, SwiftUI, and CoreAudio.