Multiple sound outputs

I wondered if it might be possible to send sound output from my teeny Macbook to both a USB-C display and a bluetooth headset simultaneously, with different volume setpoints. Turns out, it’s extremely straightforward!

  1. Open Audio MIDI Setup app. It is located in the Utilities subfolder of Applications.
  2. Click on the + at bottom left to create a new Multi-Output[/Aggregate] device. Name it.
  3. Click on the device name in the list at left, and then select Use for each input/output source you want audio sent to[/accepted from]. Volume levels can be set differently for each source and channel by clicking on that device in the list at left.
  4. If you want to control the master volume for these combo devices with your keyboard, get Soundflower and follow these instructions, which work even with Multi-Output/Aggregate devices.
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