SoundSource 6
You can now play audio through multiple outputs at once, with grouped output devices.
[…]
SoundSource has outstanding new support for sending audio to AirPlay devices like HomePods, Sonos systems, and more. That means you can route an individual application to one or more AirPlay devices, while leaving the rest of your audio playing from a local output. You can also stream all of your Mac’s audio to multiple AirPlay devices, in sync.
[…]
The new Audio Devices window gives you tremendous control over the audio devices connected to your Mac.
These days, I only use my own ToothFairy app, but if you have more advanced audio needs SoundSource has lots of features and a nice interface.
Previously:
