yep... but how good are the Edirol internal mics? I've heard loads of people rage to them... maybe the shotgun isn't actually as good?
What I mean is, they're OK, but they sure can't compete with a real set of phantom-powered condensers, heh. And regarding the shotgun, not sure what you are trying to accomplish, but shotguns typically aren't you're best choice for music recording if that's what you want to do. But, if you're looking for something to slap on top of your PD170 for everyday use, then yeah, that's a good idea, but for music, not so good.