To show the volume control in menu bar on Mac OS X follow the below procedure:
Open the Apple menu > System Preferences > Hardware > Sound.
Go to the "Input" tab and check "Show volume in menu bar".
CCM is a leading international tech website. Our content is written in collaboration with IT experts, under the direction of Jeff Pillou, founder of CCM.net. CCM reaches more than 50 million unique visitors per month and is available in 11 languages.