One lined, most not ... lines don’t matter, dots don’t matter. Either you put the time in to learn how to properly intonate the bass while playing, or you’ll play out of tune most times. There’s no magic secret, you need to put the time in with your bass. A whole bunch of fretted players just never get this basic fact, people who play stringed orchestral instruments get it right away. You need to put the time in and work with the bass and your ears ...