SoundBridge

What it does

Many external monitors connected via HDMI or DisplayPort have fixed-volume audio output — macOS shows the volume slider grayed out - chenjy16/SoundBridge

• IW
  I wrote a macOS C++ audio driver to fix HDMI volume controlsMar 2026 · github.com · ▲6

  Hi HN, If you’ve ever plugged an external monitor (HDMI/DisplayPort) or a USB DAC into a Mac, you probably know the frustration: the volume keys instantly die, the volume slider greys out, and macOS throws a icon at you. Apple strictly treats digital outputs as "Fixed Volume" devices and refuses to apply software gain. I got tired of this, so I built SoundBridge – an open-source, ultra-lightweight system audio router that natively restores volume controls for any external device. Repo: https://github.com/chenjy16/SoundBridge The Problem with Existing Solutions:…

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