like the topic said, i have never done corp or played contra before. however, i have played sousaphone in my highschool marching band for two years (i'm 15, 16 in june). are sousaphone and contra very different (does contra require more air?) and what type of mouthpiece is typically used or should i keep the one i have (jupiter 24AW and bach 24AW). also, if there are any jersey surf, raider or any contra vets, can you give me some advice and tips?