Gradient Noise at ICMC 2026

Posted on April 15, 2026 by John CS Keston

I’m pleased to announce that I will be performing the world premiere of my piece Gradient Noise at the International Computer Music Conference (ICMC) in Hamburg, Germany on May 11 at 9:30pm. The following video except represent the work in progress. The final piece will be 10 minutes long and contain up 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 Parking Ramp Project, SYNTAX, and Rhodonea. These generative works are projected for both the performers to read and audience to experience. I write software to generate and animate the geometric forms, and 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 visualised 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.

Through Gradient Noise I am rethinking the relationships between musicians and machines. By translating the properties of n-dimensional Perlin noise into a musical language, the piece presents a unified ecosystem with coordinated timbres and geometric forms. Thus generating a living environment that requires active participation and improvisation. Ultimately, the work presents a contemporary model for computer music where the performer does not simply follow a score, but negotiates a path through a responsive, multi-sensory experience.

Video: Rhodonea II at SEAMUS

Posted on March 25, 2025 by John CS Keston

This video is a new interpretation of Rhodonea (Rhodonea II) that I performed for SEAMUS (the Society for Electroacoustic Music in the US) at Purdue University on Saturday, March 22, 2025. Attending and performing at the conference was a fantastic experience. I’ll share more about the event in future post.

The animated, generative, graphic score developed with Processing.org sends corresponding MIDI data to one of my favorite electronic instruments of late, the Dirtywave M8. Previously I performed the piece in Ireland at the inaugural Radical Futures conference.

The piece serves as a model of how we might collaborate with near future synthetic entities. Software feeds automated, algorithmic, projected visual cues, tempi, and low frequency oscillations to improvising electronic musicians. The visuals, based on Maurer Roses, suggest melodic, harmonic, and percussive gestures that are modulated by data streaming from the generative animations. Throughout the piece the artist adapts to the familiar yet unpredictable graphic scores and corresponding signals.

Note: please watch in full screen with the lights off and listen on headphones or high fidelity stereo speakers

Radical Futures Performance Piece: Rhodonea

Posted on May 16, 2024 by John CS Keston

On Wednesday, May 8, I debuted a performance piece titled Rhodonea at the Radical Futures conference at University College Cork, Ireland. At the concert I had the privilege of sharing the bill with Brian Bridges, Cárthach Ó Nuanáin, Robin Parmar, and Liz Quirke.

Rhodonea is a series of audiovisual etudes performed as a model of how we might collaborate with near future synthetic entities. Software feeds automated, algorithmic, projected visual cues, tempi, and low frequency oscillations to improvising electronic musicians. The compelling visuals, based on Maurer Roses, suggest melodic, harmonic, and percussive gestures that are modulated by data streaming from the generative animations. Throughout the piece artists adapt to the familiar yet unpredictable graphic scores and corresponding signals. The end result is an impression of how humans might interact with AI in a collaborative and experimental way.

I chose to perform Rhodonea as a soloist although it can be performed by an ensemble of up to four musicians. The generative and improvisational aspects mean that every performance is different than the next, but the piece has a consistent signature that leads the music. This includes modulation corresponding to each rhodonea that is translated into MIDI data and fed to parameters that effect the timbre and other aspects of the instruments. I captured the video above the day after the performance, which illustrates the characteristics of the piece, which I developed in Processing.org.

For this international performance I used four instruments inside Ableton Live 12 controlled by an Arturia KeyStep to minimize the gear I needed to travel with. The Ableton instruments I used were Drift, two instances of Meld (a macrosynth new in Live 12), and Collision. In the video below you can see how the generative graphics are manipulating the filter in Drift.

Interactivity Sonified Workshop at INST-INT

Posted on October 6, 2015 by John CS Keston

The INST-INT 2015 conference, exploring the “…art of Interactivity for objects, environment, and experiences,” just happened and I had the honor and privilege of giving a workshop at the event titled Interactivity Sonified. The intent of the workshop was to teach attendees to sonify their work by triggering, generating, and processing sonic textures or musical forms through interactivity. I covered several basic programming techniques for including sound in projects with input devices and numerical values. Touchscreens, microphones, cameras, gyros, MIDI controllers, or any other stream or set of incoming data might be used to add sound. The sonification of this information adds a whole new sensory dimension to interactive installations and performances.

During the workshop I covered sonification examples in Processing.org and Max while looking at input signals from the Leap Motion, MIDI controllers, video camera, microphone, keyboard, and trackpad. We experimented with recording, looping, reversing, pitch shifting, and granulating sampled audio. We also looked at modeling waveforms and processing them through lowpass, highpass, bandpass filters, delays, and reverbs. Finally we looked at the convolution reverb in Max for Live trying out several of the IRs as well as discussing the technique of sampling impulse responses.

In this video I asked the attendees to pull out their headphones cords after completing the task of triggering sounds with a moving object. The resulting cacophony in the room was quite beautiful! I thoroughly enjoyed giving this workshop and would love to do it again. Please be in touch if you’re part of an organization interested in a workshop like this. For more information you can view the slideshow for the workshop at instint.johnkeston.com. Keep in mind that the slide show just a fraction of the activities. Most of the time was spent applying code and examples to either trigger, generate, or process sound.

Free Track from Ostracon Debut Unauthorized Modifications

Posted on June 17, 2011 by John CS Keston

Unearthed Music is giving away a free track from the album Unauthorized Modifications by Ostracon (John Keston on electronics and Graham O’Brien on drums). This album was recorded and mixed at by Adam Krinsky at the former Flyte Tyme studios and mastered by Tom Garneau of Audioactive.

To get the free track Probability Defect visit the release page and enter your email address in the box in the lower right of the screen. You will then receive an email message with a unique link to download the track at 320kbps. Please let us know here what you think of it and join us for the release show on Friday, June 24, 2011.