I tried to watch Apple’s October 5th Special event stream but was stymied by missing audio on my PowerBook. It worked fine on the iMac so I got my fix of Special Event Goodness™ OK.
minusdelta posted a fix he (she/they) found to the Apple forums and I repeat it here:
- Quit Quicktime.
- Open /Applications/Utilities/Audio MIDI Setup.
- Select the Audio tab
- Set the output to 44100 not 96000 and quit
- Try again in quicktime.