The first thing that you need to do is to ensure that you have iTunes installed on your computer. If you do not have it, visit the official Apple website and download it from there. It is a free application and is not too large in size either, which is why you will be able to conveniently download it to your system. If you have iTunes installed on your system already, make sure it is updated to the latest version.
Run the iTunes application and add songs to the library if you have not done so already. There is no need to add all your favourite songs to your iTunes playlist right now, as you can take your time to do that later.
Once you have added songs to your iTunes playlist, return to the “View” menu and then locate the “Show Visualizer” button - click on this to display the Visual mode.
In order to see the changes that occur as you make the modifications, play a song from the iTunes library.
Once you have started the song, click on “Edit” and then “Preferences” from the iTunes menu to open the “Preference” window.
In the “Preference” window, first click on the “Advanced” tab and then click the “General” tab.
You will notice the options "Small", "Medium", and "Large" at the bottom of the panel, right next to the "Visualizer Size". Choose either of the three options to change the display size of the Visualizer.
If you want a full-screen of Visualizer effects while your music is playing, check “Display Visualizer Full Screen.”
You can designate the technical aspects of your Visualizer from the “Visualizer Options”. To access the options, click on “View” from the iTunes menu and then select “Visualizer.” You will be able to customise iTunes Visualizer by changing the “Display Frame Rate”, “Cap Frame Rate at 30 FPS,” “Use DirectX” and “Always Display Song Info” options.
Make the changes permanent by pressing “OK”.