JPR Support

Just suggesting a few alternative ideas.
You're right i use Goldwave to quiclky edit audio,, often fading out songs in 4 seconds that have a 10 second fade out.

Personally if i was running windows 7, and required jingles or effects to be faded early, i would make multiple copies of the same jingle and name them as required. I wouldn't mess with fade points etc.

Changing the fadeout point doesn't modify the file, this is the advantage of this feature. It just set a point where the output volume of the jingle will fade out. This is usefull for who load a song and want to play only a part without copying the file, editing it.
But now it looks OK, I think I found the crash problem, I changed some code and JP no longer crashes.

Well done!
I understood that it would not change the sound file. You can do the same with traktor beat grids, and again with ots studio.

Pehraps, but there, we will not need any third party software

I know 3rd party software isn't required.
I mentioned 3rd party software as an example to show that I understood what your taking about.