The X1 allows you to route the mic output to a separate jack if you have the harmonizer board installed. At least that's how I remember it ....some two or three years ago.
Boy - it's been a long time since I had one!
Maybe the XD9 will RElight my fire....who knows. Tuesday night I played a straight acoustic piano bar - no gimmics at all. That's alot of work on my little pinkies! My left hand really got a workout THAT night.
Still....it was refreshing in some ways. The simple arrangement of vocal and piano - nice sound.
Anyway - check out the mic routing, I'm pretty sure I'm right about this.