For looping, Andrew Bird uses two Line 6 DL4 delay pedals: one for rhythmic pizzicato, and the other, "is dedicated to the ambient bowed strings." The DL4, on top of being able to loop, can also slow down and speed up loops, lowering or raising the pitch of a recording by an octave in the process. This feature occurs in many of Bird's songs, as well as live performances. He also uses an octave pedal to give the violin the range of a bass.