Mixcraft creates this on my desktop when I launch it. ? DIdn't see any ref to it in the user manual. Anyone?

Not sure I'm getting how to best use these (the voices that come up when you click on the little piano on a track). Are these considered "soft syth" type things, and if so, how to I use them? "Musical typing" is not going to fly, I want to play my real synth w/these sounds if pos...