Feedback cycles – sound through material. Using transducers in place of standard loudspeakers enables the user to investigate the acoustic properties of a material or object – a transducer physically vibrates a surface or thing in order to produce sound. Recent tests (by me) have explored the use of a surface transducer in conjunction with the elastic band drone machine. The elastic band drone machine was the resulting instrument built during a ‘transmission+interference’ workshop in Athens where laser light or LED light is shone across a short space towards the surface of a solar cell. In-between the light source and the solar cell is suspended an elastic band on some nails banged into a board of wood. The elastic band is set into motion with a tiny vibration motor and as this band vibrates we hear the low frequency drone of light diffraction across the surface of the solar cell. By then playing the sound back using a transducer attached to the wooden board we are then able to explore resonant feedback in the system – the elastic band vibrates at a particular frequency -> this vibrates the wood -> this travel through all the materials including the elastic band. Further resonance / feedback can be explored with the use of a sound modulated LED as the light source across the elastic band. Need to explore more of Cybernetics – systems feedback. Read Andrew Pickering.