m = medio, or middle finger
a = annular, or ring finger
This example will help you develop rapid alternation for downstrokes and middle finger strokes.
Notice the simultaneous use of the middle and ring fingers as well as alternate picking in this country guitar phrase.
Hybrid picking can also be quite helpful on pivoting arpeggio lines, also known as pedal-point in classical music.
Hybrid picking may be used in scalar sequences as well as arpeggios. The example above shows the application of hybrid picking to a descending scalar sequence in 6ths.
This lesson comes from:
Terrifying Technique for Guitar