The focus of this paper is on the refinement of a sound generating technique I describe as graphic waveshaping, which may be understood as a form of non-linear distortion synthesis where transfer functions are time-varying and derived from visual scan lines. In previous work I have discussed the process in basic form and as utilized in solo, improvisational performance . In these prior investigations, graphic waveshaping is the core around which a complex synthesis network is composed. The performer’s main interface is prepared works on paper, scanned by digital video microscopes that pass image data to custom software. In this work, the performer’s objective is to guide the conversion of image into sound, by selecting visual material and continually adjusting the parameters of interpretation. The system is composed with the precondition that image to sound relationships are unfixed and that the performance situation is exploratory, giving rise to the discovery of new sounds and the formative circumstances. When used in conjunction with feedback driven synthesis techniques, graphic waveshaping provides a useful means to elicit and influence temperamental behaviors conditioned by a direct visual interface.
In this paper, I turn my attention to further explicating the technique, addressing the improved production of sonic outcomes based on visual correlates, while emphasizing use in the design of performance systems with erratic tendencies. This includes new directions in the creation of visual images intended specifically for graphic waveshaping to purposefully elicit certain types of behavior, as well as reconsiderations of image acquisition in terms of resolution and input devices and further applications of image analysis for determining the transfer functions (i.e. wave shapes). Further, the paper links to key historical precedents and pertinent contemporary research in graphic sound synthesis, where in general an electronic transducer or computer program is utilized to assign image attributes to the creation of an auditory experience.
 Greenlee, Shawn (2013). Graphic Waveshaping. In W. Yeo, K. Lee, A. Sigman, Ji H., G. Wakefield (Eds.), Proceedings of the International Conference on New Interfaces for Musical Expression (pp. 287 – 290). Graduate School of Culture Technology, KAIST, Daejeon, South Korea.