Thanks for the great work.
There are two things I thought can be handled better:
1. When you add new songs using "Add Files" the last opened directory will persist, however when you add folder via "Add Folder" and you want to add another folder, the directory doesn't persist. I think it would be convenient if it did, for example if you wan't to add several albums from the same artist.
2. When there is only one excluded file, and that excluded file is played it crashes WACUP. This happened when I wanted to crop a song but accidentally excluded it, when I cropped and played it crashed the player. I think currently WACUP skips the excluded files but if there is only one excluded file it will turn into a loop.