Press Edit button

Press Create New Set of Hot Keys

Enter the name of the page and press Save New Set

Go to Library

Press Change Hot Keys button

Select the desired audio file from the Audio Library

Click on an available Hot Keys button

When done, press Play Hot Keys 

Select the desired Hot Keys page

Press a Hot Key to begin play

Press Hot Key again to stop play

Up to 3 hot keys at a time can play on top of each other