I have an OEM n64 controller with a hyperkin adapter, but the c-buttons read as analog inputs (z-rotation+ etc), this is an issue because i have to use dpad-up to use savestates on the practice rom since the analog input cant be left-right or up-down at the same time. is there any fix to this issue?

I had the same issue with the same setup (OEM controller + hyperkin adapter). Wasn't able to solve it unfortunately.

as far as I know, you can't use 4xc on emu. unless you switched to keyboard controls. I can't remember if the raphnet adapter does the same thing as a hyperkin adapter, but I use the same thing as you. OEM controler, and a hyperkin adapter. as far as I know, 4xc is only able to be used on console.