Player Menu
 

Play / Stop
This will start playback from the previously stopped song or from the last song selected in the Arrange window.  If the last song selected was in the Find window, it will start playback from the Find window.  Of course, if a song is currently playing, it will stop playback.
Previous Song
This will play the previously played song.  (This will not work if in "Random Playback" mode though)
Next Song
This will play the next song.  (If in "Random Playback" mode, this could be any song on the list.)
Random Playback
If this is checked it will cause DJ Twist & Burn to playback songs in a random order.  Otherwise, the next song played will be the next one down the list.
Continuous Playback
If this is checked, when the currently playing song is finished, DJ Twist & Burn will start playing the next song.  If this is not checked, playback will stop when the current song finishes.
Adjust Master Volumes…
This brings up the Window's sound card mixer control, which allows you to adjust your Wave, MIDI, CD, auxiliary and master volumes for your sound cards.  You should adjust this first and then raise or lower the volume of your speakers for best results.