Volume Mixer in Windows 7, not just show device volume but also lists all applications that are currently running and producing the audio. You can control the audio of any of the application from there on. So when you are having more than one application that is producing sound you can control from here and stop it as well.
The ribbon interface in Microsoft office makes it easy for users to complete tasks easily. You can get a similar interface in LibreOffice by following the steps below: 1. Download the latest version of LibreOffice (at the time of writing this post, the version is 5.4) 2. Open LibreOffice Writer and Go to Tools > Options. 3. Under LibreOffice section, click Advanced. 4. Check the checkbox saying, "Enable Experimental Features". 5. Now go to View > Toolbars > select Notebookbar. 6. After restating, you should get ribbons. 7. You can still access the old layout by clicking on the three slider menu button and selecting MenuBar, to show the old style menu bar as well. If you want to change the tool bar style, you can select View (in the old style Menubar) > Toolbar Layout > Default. You can do the same for LibreOffice Calc as well.