Use the spacebar as a shortcut to play or pause the song.
Solo an individual track by clicking on the name box at the bottom of the channel.
Change a track's panning with the dial at the top of the channel to move its output toward the left or right speaker. Click on the number in the center of the dial to type in a new value, or click on the dial directly.
Reset a track's volume or panning by holding the control or alt key (command or option on a Mac) and clicking on the volume slider or panning dial.
Reset all tracks' volumes and panning by clicking on the icon to the right of the play button.