Acousmatic tape music piece for spatialized brass ensemble by Yuval Adler, composed for Music 222 (Sound in Space) during the Spring 2017 offering.
The main sonic element consists of twelve brasswind parts spatialized in a sphere around the listener. Instead of melodies, the musical material is mainly comprised of sound masses. Each of the twelve parts is recorded separately, and later combined into equidistant points on a sphere in 3rd order ambisonics. This piece will aim to give greater clarity to an otherwise dense musical mass of sounds by separating them in space, and to add a new dimension of progress to a piece which has no melodic changes.
Musical Form and Technical Details
The first section of the composition reveals the twelve parts, spatialized using the AmbiX VST in Reaper DAW, in different combinations until all twelve parts are playing a dense cluster of semi-tones. The center of mass of the soundfield changes according to which parts are playing in any given moment. In the middle of this section the notes change from recordings of softer tones positioned close to the listener to recordings of louder ones positioned farther away. Instead of overall intensity, the change is conveyed through different microphone positions in recording, and different levels of reverb applied to the tracks. The wet only part of the reverb for each channel is sent to the omni (W) channel of the ambisonics mix, for an approximation of the diffuse effect.
In the second section the sphere of sounds goes through different spatial manipulations to focus the sounds in different areas around the audience, again moving the center of mass of the soundfield, this time as a cohesive whole that is mathematically manipulated in ambisonics. For this the Ambisonics Toolkit VST is used. Since this plug-in library uses first order ambisonics, the soundfiled is degraded to first order for this section. The different spatial manipulations are coupled with different spectral filters to articulate the spatial manipulations performed.
In the third section the soundfield is manipulated by having the sound sources go through an interplay of changes in portrayed distance from the listener using level changes in the mix between them.
3rd Order Ambisonics File
For listening in a proper environment that supports 3rd order ACN/SN3D ambisonics decoding and playback: https://ccrma.stanford.edu/~adler/222/dodecahedron_may26_2017_bing_grail.wav
Binaural Render File
For reproduction over headphones: https://ccrma.stanford.edu/~adler/222/dodecahedron_june10_2017_binaural.wav