Gradient Noise [stereo version]

video upload by John C.S. Keston

"On May 11, 2026 I premiered my piece Gradient Noise at the International Computer Music Conference (ICMC) in Hamburg, Germany. The following video represents a stereo, studio recording of the performance. The performed piece was quadraphonic and contained one to four layers of instruments with independent, corresponding, video objects.

Since 2019 I have been composing animated graphic scores for ensembles and soloists. Examples include collaborative works like Parking Ramp Project or SYNTAX, solo pieces like Rhodonea. These generative works are projected for both the performers to read and audience to experience. I write the software that generates and animates geometric forms, and then establish rules on how the forms are read, whilst allowing improvisation and the emotional response of the performer to play an integral part in each piece.

Gradient Noise, written using the Processing.org language, translates values generated by the Perlin noise algorithm into independent layers of seamless loops repeating at variable intervals. These loops are visualized as geometric forms, abstract visualizations, and evolving structures. The data generated is aleatoric, but the values can be tuned to range between slowly moving gradients or rapid, angular forms. When the sound and visuals are synchronized I respond not only to the animation but also to the changes in the timbre of my instruments."

Follow-up to this post.