Marc, your recent questions are far to vague and general, you might get much more help if you were more specific and clear.
I'd be glad to offer some suggestions, but honestly, I am not sure what you are asking!
My bad, I was pretty vague. What I want to know is how to add sounds I find on the internet into Mixcraft to be used with my keyboard and used in my songs. Also, what exactly do I search for in google when I go searching for the sounds. Let's say I wanted to find some more string sounds, what exactly would I want to search for in google to find some that are compatible with Mixcraft? And what is it that makes them compatible or not compatible anyways?