The flamenco guitar technique picado is used for playing melodies or to accentuate specific notes within an arpeggio. The picado is played using alternating rest strokes or apoyando with the i-m, m-a or i-a fingers, producing a very fast run of notes at speeds that can go up to 16 notes a beat, making a fast scale. Movements come from the middle joint of the finger and commonly the tip joints of the fingers are straightened. This 90 degree angle of the fingers is required since the middle finger is longer than the forefinger. The thumb is placed slightly on a bass string or, when playing picado on the bass strings, the thumb rests on the soundboard going up or down, always keeping the hand motionless. When playing an i-m picado, starting on the 1st string, the i finger plucks the 1st string towards the soundboard, pushed against the 2nd string. Next the m finger plays a rest stroke, alternated again by an i finger rest stroke. Alternating the forefinger and ring finger is of the utmost importance. As soon as a finger plays a note, the previous finger moves away from the string, one finger replaces the other finger.