If you are finding the music fade timing at the end of a slideshow is very short, then this is why.

In the early and current ProSelect v2013r1 software releases, we found a small bug - when your slideshow time is NOT synched to the slideshow music time, the music will be faded down at the same rate as the "Transition" time that you setup in your Slideshow Style.

This bug has been fixed by making the fade down time the same as the previous versions of ProSelect (namely 6 seconds). This fix is part of the coming ProSelect v2013r1.3 update which will be released shortly.  

UPDATE: Now released and available from the ProSelect Software Downloads area (under the Downloads menu).