To adjust the volume on a Google Hangout call, you'll need to adjust the volume of the device you're listening on.
My wife's comp has a pair of Logitech z625 speakers. They sound fine, but they're afflicted with obnoxious potentiometer scratching that I can only briefly subdue with Deoxit. Is there a better fix?
Unlike Windows, macOS doesn't let you adjust the volume of each app on your Mac individually. However, you can achieve this ...