I know where my computer's volume controls are - and if I have a keyboard with volume controls, that's what they work on. I almost never want to touch a specific app's or website's volume control... unless its volume is way too soft even at max system volume.
Basically, I don't need a gazillion interfaces. One suffices. Just don't go out of your way to make that generic, system-wide interface insufficient for your app and it'll be fine.
I know where my computer's volume controls are - and if I have a keyboard with volume controls, that's what they work on. I almost never want to touch a specific app's or website's volume control... unless its volume is way too soft even at max system volume.
Basically, I don't need a gazillion interfaces. One suffices. Just don't go out of your way to make that generic, system-wide interface insufficient for your app and it'll be fine.