Thank you so much for the information. From what you have told me it looks like the XD3 will be hot enough to put directly into channel 1 of the Motion Sound KP-200S. while the Millenium can go directly into channel 2 of the KP-200S because it may sound muddy through a mixer. I guess the bottom line is that I'll try it without a mixer and then add one if needed. I'm such a neophyte with this stuff that I am worried that I won't be able to tell if it sounds good or not.

Your collective advice saved me from making an unnecessary purchase. Thank you.