i had the same problem. changing audibles before every game. but you can change the playbooks before hand. go to the first madden screen and click on my madden. then go to settings, then click game options. then you'll see where it has your playbook for offense and defense. you can change them there then go and set your audibles. that way when you pick that team on xbox live the playbooks you want will already be selected, and will have your audibles.
hope thats what you were talkin bout!