Another way to learn to play bass is to learn each note on the bass fret board and read directly from the bass cleft, right above your tabs in BB. You can start from using 1st position, first 5 frets on bass fret board including open position and when you are comfortable with all those notes, move up to 2nd position and so on. The tabs are there to show you how it was originally played but gives you no note learning ability. Consult MelBay Bass Teaching literature for a better explanation. However, having said all that, Mac is correct for the majority of PG music songs. If you do what he says and they are still wrong, the software allows you to move the numbers around to where they will be correct. I think a BKM (best know Method) has already been posted on this subject. Hope this helps.