Is it Possible To Alter Jhin's Ult Music Through Files?

sure, you have to get the sound file and have it named as the same thing though. you will have to find exactly where but it should be somewhere around here C:\Riot Games\League of Legends\RADS\projects\lol_game_client_en_us\managedfiles Might be somewhere else but most sound files seem to be somewhere in there

Be careful. Modifying your client can get you banned by RIOT because they may think you're trying to cheat.

I think they are part of his voice lines,so if you change the music you also change his VO.