Okay, so after you've put your music on the frame, you want to click on the frame and open up the
"properties" tab on the bottom of your screen.
In the properties you'll see a button that says "edit" click that and you should open up a menu that looks like the one below. To edit the sound you just add points on the graph by clicking in an area on it and then dragging that point.
so to make it fade out you just want to have a line slanting downwards at the end of the song, and to fade in you make a line slanting upwards in the beginning of the song.
Here a little picture I made if you dont get it...
also make sure you do the same thing to both graphs, because each one is a different speaker.
