You might be familiar with the old-fashioned volume control panel that used to be part of your stereo or your audio system. These days, most people have their audio systems built into their mobile devices, so you don't need to worry about having to buy a new set of speakers or headphones if you want to change the volume. But what about when you listen to music or watch a video? You need to change the volume to get the best sound, but most people don't realize that the volume control panel has more options than just the slider. There are actually four different volume control settings that you can choose from, and you can switch between them using the slider or the buttons.