Yes, you read it correctly. If the soloist slows down, the tape slows down - without any change in pitch. If the soloist skips measures, the tape will skip. You will have the opportunity to see it demonstrated at the VMEA Convention. No, I didn't forget about the cost.
Tapes are extra, but there is a starter package ideal for senior high and junior high.
They already have an extensive list of tapes available for all band and orchestra instruments and are going to select additional titles from the Virginia and other state lists. Sure, I played many things I liked in festival competition, but not music which didn't suit the capabilities of my groups. You know the strong and weak sections of your group and should pick music which utilizes the talents you have and doesn't expose those weak sections. I also think it is important the music you select is pretty well liked by the students. I will never forget the time I forced the Maury Band to perform the Golden Sonata by Henry Purcell.