; Hiro Yamamoto Active : 1984 â `` 1989 Instruments : bass Release contributions : Deep Six ( 1986 ) to Louder Than Love ( 1989 ) Hiro Yamamoto was a member of the original band formed in 1984 . ; Hiro Yamamoto Active : 1984 â `` 1989 Instruments : bass Release contributions : Deep Six ( 1986 ) , Screaming Life ( 1987 ) , Fopp ( 1988 ) , Ultramega OK ( 1988 ) , Louder Than Love ( 1989 ) Hiro Yamamoto was a member of the original band formed in 1984 .