Maintaining and Constraining Performer Touch in the Design of Digital Musical Instruments.

Expression in musical practice is inextricably tied to the touch of the performer. In digital musical instruments (DMIs) the relationship of touch to sound is indirect: the nuances and fine detail of performer control can be flattened and limited during the translation of physical gesture to physical sound. The locus of this research is in the contact made between performer and DMI: focusing on this area can grant insight on fundamental issues of human computer interaction, particularly regarding intimate and expressive control of tangible interfaces. In this paper I present my research on this topic so far, which includes empirical studies that focus on specific parameters of performance where touch plays an integral role. The first study investigates how dynamic vibrations in an instrument's body can guide the hand of a performer and assist with intonation. The second study looks at asynchrony between action and sound and the influence this latency has on the perceived quality of an instrument.