I was a little late on downloading the new VSL tool released in April, but I finally did it. Thing is, I loaded a song I was working on that used the old VSL Performance tool, and now some of the legato violin lines mess up here and there where the overlapping notes didn't agree too well with the new tool. Since my old Performance tool is deleted (with no download available on vsl.co.at), I have no references to change the parameters in the new tool so the legato lines play correctly.
Yes, make sure not more than 2 notes overlap. When I played legato with the old tool I had a habit of holding multiple keys for too long, this can screw it up with the new tool. So go in and edit to make sure no more than two notes overlap at the same time.