I am just learning double bass. Mine is tuned in fifths. On many notes, other strings vibrate, too. This phenomenon is probably also present on basses tuned in fourths. Is it ever a problem, and if so, what do you do about it? Conversely, some notes do not stir up sympathetic vibrations, or only very weak ones, and sound weaker. Can this be a problem, and if so, what do you do about it?