Three hundred grams of latex and steel in one day (ALKU 111, 2011, 7" balloon-pink vinyl).
Two pieces for hand-held inertia/friction systems.
Players: Monica Biagioli, Amanda Canals, Daniel Desiderio, Jose Ignacio Fournier, Federico Guerrero, Roc Jiménez de Cisneros, David Moran, Carlos Ortega, Lucrecia Pérez, Gemma Planell, Anna Ramos, Ricard Ramos, Lluís Surós, Carme Tarín, Julia Wolf.
Punani series part 13
This recording contains unprocessed acoustic sounds only. *
'Three hundred grams…' employs a simple inertia/friction model using latex balloons and hexagonal stainless steel nuts played at different speeds and distances from the recording device. Up to 15 of these systems were used simultaneously during the recording session, in which very vague instructions were given to the players.
The system produces extremely short pulses (between 180 and 220 a second) in very fast trains that create a sound reminiscent of a non-sinusoidal waveform (such as a sawtooth wave). These pulse trains follow David Huron's principle of temporal continuity, which states that ‘In order to evoke strong auditory streams, use continuous or recurring rather than brief or intermittent sound sources. Intermittent sounds should be separated by no more than roughly 800 milliseconds of silence in order to assure the perception of continuity.’ 
Like the compressed liquid gas horns used in the first EVOL acoustic piece (see ALKU 89), the inertia/friction system used here is imprecise, unruly and hard to control. In a way, that makes these systems similar to our autonomous algorithms . Despite the challenging nature of the instruments, interpreters managed to get quite different behaviours and frequencies out of them during the recording session. The resulting superposition of various detuned pulse-trains creates an all-acoustic approximation of the iconic supersaw and hoover sounds that have been the centerpiece of our Rave Synthesis theory and research since 2008. The piece is dedicated to Jocelyn Bell Burnell, co-discoverer of Pulsars in 1967 .
Roc Jiménez de Cisneros, May 2011.
Photos by Gemma Planell
* Mark insists on clarifying there was a conversion from acoustic to electrical to digital to electrical to physical.