Today at school in my music industry class we were recording a song on a big huge mixing board. The teacher was playing my bass and said it needed to be intonated. I dont think it does but i dont know much. This got me thinking about my bass. I noticed that the A string is noticably quieter then the rest of the strings. Is this what she was talking about? I replaced the strings last week. It seems as if only my A string died. what do i do??