Interdisciplinary Master's to PhD in Cognitive Neuroscience or other specialized psychology area?

[kittyoverthemoon]

Would it be unattractive to PhD psychology/neuroscience admissions panels to have a master's in Interdisciplinary Studies? I would focus my studies much like a general or experimental psychology master's program with the ability to take a few extra courses not exactly offered by psychology departments (examples of actual classes I'd choose would be evolution, psychoacoustics, and music theory). My dilemma is that I'm afraid to wait too long after undergrad (I graduated this past December 2015) to go through the application process of graduate school, but I'm trying to decide between a psychology/neuroscience route or strictly an audiology route. I am in the process of becoming a newborn hearing screener working under an audiologist but don't know if from now until November/December will be enough time to know if it's the job for me (since if I'm not mistaken, psychology grad program applications are due nearly a year in advance). My studies during the master's wouldn't be completely out there, but I haven't taken enough courses to know which area I like best (music cognition & neuroscience or audiology). I only got a psychology minor but completed the bulk of it at the very end of my undergrad career (so like, 5 basic courses total over the breadth of practice and research in psychology), and I fell in love with it, but I'd like to just take more coursework that I'm interested in to narrow my core academic interest, and then go from there. Any advice appreciated!