http://www.worshipbackingband.com
Today, purchased two copies of the player, and 3 songs
See http://www.worshipbackingband.com/uk/index.php/multitrack-pro-wav-player-video-guides
He created 14 STEP WAV files, making blank ones if it is blank. Placing them in a folder, dragged the folder to the app to install it.
Inside of the player, press control-M to open up the editor which allows you to set the start and end points.