Can some body explain what you can do with the "KEY Tune" option on the AUDYA?

I have no been able to understand what is for. I try to follow the examples in the manual, but still I am no able to make it work to see an example. I am really in the LIMBO in this one.

You can assign Wave files to different keys on the keyboar so that when you press the key, the assigned wave file plays instantly. Features such as HOLD are also applicable (Hold=OFF, when you release the key, the wave file stops playing; Hold=ON, when you press the key, the wave file plays and continues playing even after you release it). Wave files can also be assigne to be triggered when you play specific chords - great feature for MIDI accordionists!