440 was written in collaboration with Noah Keesecker in 2003. The piece is a quartet, with each performer having two sensor controllers (one in each hand). Each performer slowly manipulates a pitch to create complex beating between the other pitches. The sensor controllers were built by J. Anthony Allen and Craig Sapp.
440 was premiered at the Peabody Conservatory with subsequent performances at the Spark Festival of Electronic Music and Arts (Minneapolis), and the Music at the Anthology Festival (MATA) in New York City.