I've noticed it only as soon as yesterday, so I'm going to pin it on the latest macOS release, i.e. 10.15.5.
The sound output is unreliable in the latest update. I have three output devices in my setup:
- Internal Speakers;
- Speakers on the secondary monitor; and
- Plugged-in headphones.
Yesterday I saw that both my headphones as well as internal speakers were engaged simultaneously. Meaning, I was listening to music on the headphones and some alarm sounds (like the sound that plays when you have hit the end of current line in Terminal etc.) would come through internal speakers.
Today I noticed that the audio from a monitor is coming from the secondary monitor's speakers while message notification sound came off the internal speakers.
Is anyone else seeing something similar?
Is this something that would be / need to be fixed or has Apple had some better understanding of sounds output and decided to engage multiple outputs at the same time?