Transparent beats in Winamp

Play a song that’s akin to the one described above. Now, ensure that the main window has the focus (its title bar should be brighter than that of other windows) and type ‘NULLSOFT’. However, since pressing [L] opens the File Open dialog, you’ll have to press [Esc] after each [L]. Hence, you end up typing [N] [U] [L] [Esc] [L] [Esc] [S] [O] [F] [T]. This done, you see that the main window goes transparent at each beat and then reverts to being opaque. This Easter egg consumes a lot of system resources. If your system runs slow, type NULLSOFT again to turn it off, or just exit Winamp and restart it.