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In his 2004 eight-channel Lascia Vibrare, rhythmic impulse patterns gradually move in and out of phase with each other, setting up spatial patterns in the room due to slight random deviations. Over the course of 34 minutes, these simple impulses evolve into sinusoidal grains, and the tonal grains then evolve into complex cluster grains. Gradually, they take on more resonance, turn to glass, become more and more sustained, then turn brighter, cracklier and noisier, and conclude by approaching the sound of Tibetan bowls and bells. The title suggests the idea "Let it vibrate!" and the piece gives the impression of a large synthetic "I am sitting in a room" feedback system with Kees at the controls, attenuating or adding jitter when the feedback starts becoming too regular, feeding in new impulses when the original impulses have evolved into noise in the background.
