I can only echo what Don said. Last week I performed for a large group of nursing home volunteers at a banquet. A man and his wife sitting in the front row about 10 feet away began whispering to each other while glancing my way. Over the years, slowly loosing my hearing, I've been able read lips to a minor degree. The guy said to his wife "It's not him singing - he's lip synching to MP3s." The song I was performing was Have You Heard by the Duprees, which requires the use of the vocal harmonizer. When I finished the song, I said, "Yes ladies and gentlemen, it's really me playing and really me singing." The guy said "Oh year, then where did you get those other, invisible singers?" At that point I had to provide the audience with a demonstration of how everything worked and sounded. They were amazed. And, I was amazed at the number of people that thought it was recorded music and I was just the DJ.

Good Luck,

Gary