Watch the Alternating Bass online guitar lesson by TrueFire from Play Acoustic Guitar 2: Rhythm Fundamentals
After you get a good grip on the steady bass technique, you're ready for the alternating bass technique. Think of it as steady bass on steroids! Now instead of just staying on one note, you are alternating between notes. This will take some coordination but if you have been working on the steady bass grooves, you'll have no problem expanding that to this technique.