So my interviewer at Berklee told me that I can submit more materials if I wanted. Do you think if I don’t submit materials then I would not have a chance of getting in?
The short answer is no, not submitting additional materials won’t mean an automatic rejection. I think the key is whether, between whatever materials you’ve submitted and your audition, you’re confident that you’ve provided Berklee with the best representation of your abilities. Note that these will be used for awarding merit scholarships as well as acceptance.