Yesterday my Pilates instructor came back after her surgery. During her absence, we had a substitute instructor for 6 weeks. I realized that the class went much more smoothly (not just for me) with the regular instructor who returned. It suddenly dawned on me that one key difference is the quality and volume of the voice. The substitute instructor was very soft-spoken and did not come across as confident though I am sure she is as knowledgeable as the regular one.
A clear and confident voice (not overbearing) does make a difference in getting audience’s attention and helping them focused.