I would also suggest maybe writing a brief short, maybe an educational brief on a subject in Audiology that interests you. Because your writing can very easily be spun as an extracurricular activity. You just need to mention in the statement and paint a picture of your work. Maybe include an excerpt, or even bring a children's story to any interviews you might have. Anything creative in a field dominated by science can be taken as an advantage. Creativity is the future. If your writing is an extracurricular activity to you, then tell them that and it will be enough. (plus a couple hours of shadowing, and maybe a few volunteer ventures, but as previously mentioned, nothing major) Good Luck!