listen RB musos have to be trained, like puppies, generally ours are now fully "mixed session" trained, I am not saying it is easy, initially I had to threaten a "back to back tune" fiddler with his bow up his **se, fortunately the instrument tends to be early evening whilst all are relatively sober and the singing towards the end of the evening when most are incapable of anything but singing! or maybe just tuned out, any way it seems to work ok, does this help?