For both sections, a packet will come out a few weeks before auditions with exercises you’ll be expected to learn. There’ll probably be a battery audition page up around the time DCI ends. You’ll play mostly as a section. For the bassline you should bring a drum pad because you’ll be rotated on and off the drum. There will be a full battery visual block and you’ll probably march over 200bpm and maybe do some body. For the cymbal line you’ll also have to learn a couple cymbal visual sequences along with your music [bring a highlighter] and the last hour/half hour will be full battery. You can audition for both but by the second audition, you’ll be better off choosing one. It’s really pretty laid back because that’s how rehearsal is. Be confident and play with your head up!