>>417901986
Static fields are not a part of your object, they're part of the class as a whole. If you can't use non-static variable somewhere, then that means you're trying to use them in a static method (which also would be part of the class rather than part of the object).

If possible in your case scenario, I highly recommend you to try using animations for audio playback instead of calling code methods. Animations are crazy powerful in unity stuffs.