Basics
Mute the Volume Adjustment Quack Sound on a Mac
Open Apps Faster on Your Mac Using Custom Keyboard Shortcuts « Mac
Instantly Tune Out a Loud Room with White Noise from Your Mac's Menu Bar « Mac OS Tips :: Gadget Hacks
How to Adjust Your Mac's Volume in Quarter Increments (And Silence the Sound Effect) « Mac OS Tips :: Gadget Hacks
guía para ubicar parlantes (Speaker placement)
The Best Tips, Tricks, & Hidden Features for Mac OS X El Capitan
How to change the volume on a Mac in small increments
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R12Operation Manual