I can't get Worship Beats to play

Worship Beats Volume 1 & 2 are programmed so that you just need to start the MainStage clock (green play button at the top right corner). This is, by default, set to start when you press the spacebar on the Mac.

Worship Beats 3 is set up so when you move the volume fader up the audio comes in, and there is no sound when the volume fader is all the way down.