Arpeggio
Where [0][x][y] means "play note, note+x semitones, note+y semitones, then return to original note". The fluctuations are carried out evenly spaced in one pattern division. They are usually used to simulate chords, but this doesn't work too well. They are also used to produce heavy vibrato. A major chord is when x=4, y=7. A minor chord is when x=3, y=7.