Grab. that is "double Thumbing"--

The thing to remember is that the more complex your finger picking pattern, the less room you have for other things, like melody notes--If you want a full picking pattern, you won't have room for a melody line--If you want to have alternating bass, your melody line is going to be kind of mechanical--If you want a bass note on every beat, you have limited options in harmonizing the melody--If you want a flowing melody line, you can only fit bass notes and chord notes in certain places--