Klangsauger is written for pipe organ with drawknobs, originally for the Organ at Tempio della Rotonda in Rovigo, built by Gaetano Callido. The piece seeks to explore transitory areas of sound, through the slow  opening/closing of the air flow through the drawknobs. A polyrhythm of beatings, immersed in several layers of noise and microtonal frictions, is the ground for the entire composition, used for their specific rhythmic quality. The performer is not anymore focused on the movements of fingers on manuals/feet on pedals, but on the delicate control of stops, dealing with the thickness, the colour and the harmonic structure of sounds in constant mutation.