Take the D10 (Pro) out of the loop. Unless it's been line-mod'd, it's running @ +4 line levels anyway. The mike pre on it's pretty quiet, and the a/d is OK. There's always room for improvement with an input mod.
For it's vintage, out of the box, it's the cadillac (and for the most part, there hasn't been a portable pro dat that's really come close).
My $.02
Rick