Editor Import Script for Platform Settings

I have written a script for importing textures and applying a default size for different platforms. When i try to approach the audio in the same way it doesn't seem to work.

I am not sure if i am suppose to insert a variable or a class that contains multiple settings. I have a feel that the solution will help me with the textures settings because i believe the method i am using is obsolete. I will be grateful for any help as i am at a loss.