how come i can play the main bassline only once on my warwick and every othere bass. but when i play older jazz basses mid 80's and earler i can play the line as many times as i want. is it a mental thing or what. like on my bass i play the line then pop the frist note of the line and i mess up. but on jazz basses befor like 1990 i have no problem. i can play it no problem on any 5 or 6 string i have played. but not on a 4.