Everyone: Many thanks for the links. Good information. The video was helpful. I’m still researching the whole topic. I presently use the TC Helicon Harmony Singer that tracks chords played on guitar. It works pretty well. But, I want to try the chords coming from BIAB to trigger vocals on live gigs. I presume I’ll need a pedal with midi connections. I also use arranger keyboards a lot. There, I use the built-in harmony features that work very well. Good vocal harmony can turn heads, if performed well and sparingly.