I've been experiencing a lag on my iMac's volume control.

I've been experiencing a lag on my iMac's volume control, and have been reading some of the suggestions to fix this.  I tried "sudo killall coreaudiod " in Terminal, but that command is not recognized, and neither is my password.  Any one out there with an idea on how to fix this?
Thank you

YOU ARE A LIFE SAVER!  I reinstalled the program and everything. THANK YOU! THANK YOU! MY HERO!!!

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