Sax? is an electroacoustic piece for saxophone, live electronics and fixed medium. It builds upon my interests relating to extended instrumental technique that was undertaken in Dimensions (2000). The piece makes use of sonic materials taken from acoustic instruments (saxophone and Petterphone) in order to explore and extend instrumental technique. Sax?, however, is a departure from the work undertaken in Dimensions since other source materials are introduced that are only related by 'affiliation'; the performer's voice discussing the significance of the mouthpiece and how different mouthpieces can produce different sonorities. The rhythmical gestures of the vocal articulations are examined through filtering and granulation. The challenge for the performer is to integrate their improvisatory framework by developing materials that have their origins within the fixed part. The performer is also given a graphic and text-based score to help him/her locate areas of, for example, texture and melody that may be developed