To describe the two positions. Both are based on the one finger per fret method with stretches one fret above and below with the outer two fingers - index ( used when ascending), pinky (used when descending) as the music or scale dictates (varies - passing tones, other accidentals etc.). The positions are named based on the key / the finger the root falls on (only 2 or 4) / and the string the pattern starts on.
The first position, most commonly learned, is called SECOND FINGER POSITION.
So for example the G major scale played 2-4 (E), 1-2-4 (A), 1-3-4 (D) would be called G2E. It is important to note that all the notes above and below the one octave scale are used. So the entire pattern on a four string bass is 1-2-4 (E), 1-2-4 (A), 1-3-4 (D), 1-3-4 (G).
The second position is called FOURTH FINGER POSITION, as the pinky finger (fourth) falls on the root.
So a scale called A4E would be played as follows : 1-3-4 (E), 1-3-4 (A), 1-3 (D), stretch down one fret with the index finger for the major seventh 1(G) slide back into position on the octave 1-3 (G) and then you can slide up one fret beyond the finger per fret center with the pinky to get the third scale degree 4(G). Descending this varies as you play the seventh scale degree with the fourth finger on the D string before sliding back into position.
Hopefully someone can understand this. It is much easier to see in a fretboard drawing.
