“Uroboro” is an audio-visual performance where the material of both audio and video comes from the perpetual mechanical excitation of the strings of two augmented table-top electric guitars equipped with vibration speakers and set in self oscillation.
From a sonic point of view, the piece explores the possibility of modifying the resonating behaviour of strings inside a feedback loop, and at the same time researches strategies to perform and improvise with it. By preparing and manipulating the guitar's strings, or by varying their length, or again by filtering and modulating the signal feeding back to the vibration speakers, the performer is able to manipulate the loop, allowing for an intuitive exploratory performativity.
A custom-built software takes care of “surveilling” the network, keeping the feedback in control, modifying its spectral weight or its temporal envelope.
The system evolves slowly as a whole, from an unstable equilibrium state to the next one, as each action performed on the augmented guitar provides the sonic material which the piece is based on.
At the same time the image of the moving strings of both guitars finally extend the concept to the video domain, and an analysis of this picture in conjunction with the sound description from each performer's signal, generate the visual material that is then projected.
Uroboro has been performed extensively during 2016, both in Finland, where the duo is based, and abroad. In each performance the setup has been adapted to the venue following a site specific approach.