This piece titled by Sonia Elks. Artistic feedback from Paula Gazzard.

There’s a principle in psychoacoustics called “stream segregation”. When you listen to somebody playing a lot of notes on the piano, but there’s a clear melody, this is because your brain groups some of the notes together. It “segregates” “streams” of notes by pitch. However, there are only so many streams you can recognise at a time. If you have more than that, the phenomenon is called “wall of noise.” In that case, your brain doesn’t know where the melody is. A constantly changing texture has some voices seem to come to the front and then retreat. No two people hear a wall of noise in the same way.

This piece has 47 different voices of sinusoidal grains. Each voice varies it’s pitch and panning position very slightly with every note. Each note is extremely short, although they do gradually double in average duration and then return to their original lengths. The longer pitches become “glissons”, which is a short sine wave that moves from one pitch to another instead of staying steady. The very end overlaps the 47 granular voices with 47 glissandos.

Podcast: Play in new window | Download (Duration: 1:04 — 1.2MB)