system sounds: should be aware of volume level
Two small things about the interaction between volume and system sounds:
- I think it would be nice to have an explicit 'no sound' option, as opposed to having to finding the right volume slider, and pulling it to zero
- If it is pulled to zero, the buttons don't play the sound. I think it would be nice to either override the system volume while this panel is open, or at least show some message that says "To try these sounds, increase the system volume" or similar