Some may find SOUND annoying.  If you are one of those 
here's a couple options:

You can STOP the sound and animation instantly.. by clicking
on the round "X" button on your toolbar at the top
of the screen.

You can choose to adjust the VOLUME or MUTE the sound
by clicking on the Sound Icon in your systray 
(lower right BOTTOM corner of your screen)

If you RIGHT click on the Sound Icon -- you have 
options to adjust the volume and tone !