(I've never found the real time triggering of harmonies by a guitar to be dependable enough for a gig. ) Like I said in the post, it sounds good enough for me. If the guitarist is good enough, the harmonies will follow. A good example is: Amazing Grace. If it is played back thru a good system it does not dissipoint. I have had a few harmonizers before this one including the Digitech Studio which was midi controlable. At that time I was working with a Ketron--Solton MS 100 work station. It was nice to have it follow the left hand. I no longer use either of those. Thanks for the feed back. e.l.c.