john's bright tone was those roto sound RS66 bass strings & he was big treble fan,,,i always noticed he used alot of treble on his bass mix,but one sad note is that his death was ruled as acute 'cocaine intoxicatoin',and not a heart-attack as first thought. those findings were published much later after his death.i think it's scary that alot of our heros are being taken out by those means,,,,,,lets be careful guys!!!