Sibilla stereo digital oscillator translates the beauty and harshness of a semi-barren mountain into a 10HP Eurorack module.
Sibilla’s sound is sculpted by various saw and sine waves running through intricate delay networks, altered by LFOs, white noises and creating constructive and destructive interferences with the aim to create an ever-evolving sound capable of droning, creating melodies and soundscapes.
Both stereo channels are the output stages of two feedback audio loops. Each loop comprises a main sub-sinusoidal wave oscillator and two saw and sine waves with frequencies affected by the generation of harmonics (right channel) and subharmonics (left channel). All waves have different phases whose offset is constantly affected by minor variations created by two pairs of grains randomly fluctuating within the waves amplitude spectrum and being sampled at a certain speed.
Waves then meet each other to a common point, together with two white noise sources, creating constructive and destructive interferences constantly affected by two LFOs movements. Interferences are then run into a resonant low pass filter and then distributed to four different delay lines from which they are fed back into the audio loops at different time intervals depending on the grains movements.