Thanks, mac:

Think I figured it out. I was selecting all tracks in the generate menu instead of the string quartet real track. Got the strings in the key of D now.

However, the string arpeggio does not fit what my self-recorded guitars and vocals are doing. Is there any way to control what the strings are playing? Probably not since it is a preset. No way the quartet could know what we want them to play. I guess this more of a Wish List question or suggestion. I will post it there.

Thanks everyone.