Ron, I find, like you, that the 518 adds pace...certainly more of a toe tapping quality! It also increases the width and depth of the soundstage. The only downside is a slight loss of bass precision...a softening of the bass. It's only slight though, and more than compensated by the increases naturalness and organic quality which the unit confers to the sound. I tend to leave it set on Shape A rather than flat, as I found it added a smidge more depth and body to the lower mid in my set up. I ran with flat for a long time though, and it sounds very good too. Using Shape C becomes a bit too dry and parched along with the 568.2, but that may be because the 568.2 has Shape C built in by default, so cumulatively it's too much. Just my preference though, using 500&602>518>568.2>DSP6000.

Cheers

George