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How to Use Your Mac's Media Keys to Adjust Speaker Volume on a DisplayPort, HDMI, or Thunderbolt Monitor | by Ing. Alejandro Villalón | Medium
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macos - What can cause the volume keys to not work but show the prohibitory sign instead of changing volume? - Ask Different
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Bug: system volume keys/buttons not working while eqMac is active · Issue #737 · bitgapp/eqMac · GitHub
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