I have the same item. I also had no interest in being a vent. And I just do not feel comfortable going along with a long produced tape. Here is what I have done, for adult shows only....and it plays well.
I found that, with the layout of the board (mouth and eyes) you can draw a pretty darn good cartoon of Mick Jagger, Paul McCartney or Elvis. There are others too I am sure.
I say I am having a contest. The first person who can identify who I am drawing wins the prize...and I really have some simple prize by the way. As I draw, I usually use Jagger, I let them see it and so far every time I have done it someone has guessed...it is the lips.
After he is done, I say, well since Mick joined us tonight, would you like to hear him sing. I have a tape of about 30 secs of play with fire, followed by satisfaction segue. As the music starts, his eyes move the first time, he looks about, then his lips sync the music and his eyes look about during the pauses.
This plays really well and they love it plus someone gets a prize. To finish it off, I have the tape made--I used to work in radio and had a studio--so the song becomes slower and slower and as it slows down I erase the face. As I wipe it out, it just garbles away.
I have yet to do it with Elvis, but that should be a natural. Dick Gaultier has some good books on this type of drawing, and some of the figures adapt well to the board.