The MediaMonkey player appears in 3 different guises, and can be switched using the Minimized/Restore controls in the upper-right corner:
Pressing the Open Files button on the player, and opening an audio Track will play the audio Track, replacing any other Tracks in the Now Playing queue. The Track will not be added to the Library.
Enabling Shuffle causes all of the Tracks in the 'Now Playing' queue to be played in random order. This can be enabled via the Player, or via the menu.
Enabling Continuous mode, cause Tracks in the 'Now Playing' queue to play without end. This can be enabled via the Player, or via the menu.
Enabling the Auto-DJ causes tracks to Automatically be added to the Now Playing queue as it nears the end of the playlist.
Allows you to customize audio to suit your equipment and environment using a 10-band equalizer. Be sure to save your settings so that you can reload them in the future. This can be configured via the Player or via the menu.
If you wish to view psychedelic visual effects synchronized to the beat of the music, click the Visualization button on the Toolbar, or View > Visualization.