Matrices approaches the percussion trio as an electro-acoustic ensemble, amplifying and manipulating sounds in a digital sonic environment. The battery involved is simple, yet far from austere, consisting of a single bowed flexatone, 2 powered fans, a balloon, a plastic bag, 2 woodblocks, and a snare drum over a speaker. The work was born out of the software I use for improvisation, a large-scale modular live-processing environment built in SuperCollider. While the score is rigorously notated, the software responds to the performer's actions differently every time, resulting in a new version with each performance. Matrices was commission by TimeTable Percussion for the Austrian Cultural Forum's Moving Sounds Festival in 2009.