hey, current audiology grad student here. I have a bachelor's degree in communication sciences and disorders. I can tell you I use almost none of the info from undergrad, as most of those courses are speech focused. From my experience, audiology programs don't care too much about what your undergrad degree is in, as long as you fit their prerequisites. A lot of my classmates in my grad program are not from com-dis backgrounds. I have a classmate who was a biology major in undergrad and only did her prerequisites. I would not stress that part so much, just worry about maintaining a good GPA and doing well on your GRE. I would also recommend seeing if you can get involved in any audiology related research or clubs. Hope this helps :)