There are three website that I know where you can get/buy drumline cadences:
http://www.drop6.com/mp5to6.htm
rowloff.com
http://percussion.okstate.edu/Pages/pastmusic.html
If you want to compose your own music(cadence), you can always use Finale (any version)
search it on yahoo.com or you can always down torrent file of them
mininova.org
torrentspy.com
check those, it might have it
O, and if you guys wanna be a better drumline, have hangouts and spend time with your other drumline members. I'm from Irvington High School and our Drumline got 5th out of 40+ band at Santa Cruz. We have no drum instructor except our senior drum captain and our band director does not even help us!!! All he do is, "sounds good," "not bad." So, get to know the other drum people and I ensure you that you'll get better.