Well...I did a "bulk dump" and, there isn't much of any use in there. It look like this:
The thing about adding new sounds to your keyboard...apparently you can use an editor(if you can find one) or you can create your own editor(if you know how).
The most basic thing that can be done to add new sounds to your keyboard while using a "bulk dump" is that if you know somebody that has the same (brand and model) keyboard as you and they have created their own new sounds (patches)then if they make a "bulk dump" and then give you that file( full off 00 00 00) and if you then make a "bulk receive" of that file you will get those new sounds on your keyboard.
The Casio WK-1250 that I have allows you to create new sounds...starting from existing sounds. It's pretty crude but you can do something different. 10 of those new sounds can be saved as user's sound in the keyboard's memory. If I do a "bulk dump" of my keyboard and give you the file of the "bulk dump" if you also have a WK -1250 then you just have to do a "bulk receive" of the file and you will automatically get my 32 new sounds uploaded to your keyboard.
Apparently you can find free patches online for new sounds but I would think that for a Casio keyboard, they will be rare. Maybe with a Roland, Korg or Yamaha one would be more lucky.