Barry Truax – Arras (1980) – for four computer-synthesized soundtracks

Author’s notes:

Arras refers metaphorically to the heavy wall hanging or tapestry originally produced in the French town of the same name. The threads running through the material form both a background and, when coloured, a foreground pattern as well, even when they are the same thread. In the piece there is a constant ambiguity between whether a component sound is heard as part of the background texture, or whether it is heard as a foreground event because, in fact, the frequencies are the same. The listener can easily be drawn into the internal complexity of the constantly shifting pattern, but at the same time can sense the overall flow of the entire structure.

Arras is a continuously evolving texture based on a fusion of harmonic and inharmonic spectra. The large-scale structure of the piece follows a pattern of harmonic change going from closely spaced odd harmonics through to widely spaced harmonics towards the end. Each harmonic timbre is paired with an inharmonic one with which it shares specific harmonics, and with which it overlaps after each twenty-five second interval. This harmonic/inharmonic structure forms a background against which specific events are poised: shorter events, specific high pitches which otherwise would be imbedded in the overall timbre, and some percussive events. However, all frequencies found in the foreground events are the same as those in the background texture; hence the constant ambiguity between them.

Arras received an honourable mention in the computer music category of the 1980 International Competition of Electroacoustic Music sponsored by the G.M.E.B. in Bourges, France.

Arras is available on the Cambridge Street Records CD Pacific Rim, and the RCI Anthology of Canadian Electroacoustic Music.

More technical notes here.
Listen to Arras excerpt.

Barry Truax – Androgyny (1978) – a spatial environment with four computer-synthesized soundtracks

Author’s notes:

Androgyny explores the theme of its title in the abstract world of pure sound. The piece, however, is not programmatic; instead, the dramatic form of the piece has been derived from the nature of the sound material itself. In this case, the sound construction is based on ideas about an acoustic polarity, namely “harmonic” and “inharmonic,” or alternatively, “consonance” and “dissonance.” These concepts are not opposed, but instead, are related in ways that show that a continuum exists between them, such as in the middle of the piece when harmonic timbres slowly “pull apart” and become increasingly dissonant at the peak intensity of the work. At that point a deep harmonic 60 Hz drone enters, similar to the opening section, but now reinforced an octave lower, and leads the piece through to a peaceful conclusion. High above the drone are heard inharmonic bell-like timbres which are tuned to the same fundamental pitch as the harmonic drone, a technique used throughout the work with deeper bells.

The work is designed to sound different spatially when heard on headphones. Through the use of small binaural time delays, instead of intensity differences, the sounds are localized outside the head when heard through headphones. Various spatial movements can also be detected, such as the circular movement of the drones in the last section of the piece.

Although not intended to be programmatic, the work still has environmental images associated with it, namely those suggested by the I Ching hexagram number 62, Preponderance of the Small, with a changing line to number 31, Wooing. The reading describes a mountain, a masculine image, hollowed out at the top to enclose a lake, a feminine image. The two exist as a unity. Thunder is heard close by, clouds race past without giving rain, and a bird soars high but returns to earth.

Androgyny is available on the Melbourne album Androgyne and the Cambridge Street Records CD, SFU 40.

Production Note:

The work was realized with the composer’s POD6 and POD7 programs for computer sound synthesis and composition at Simon Fraser University. All the component sounds are examples of frequency modulation (FM) synthesis, generated in binaural stereo, with time differences between channels. However, considerable analog mixing in the Sonic Research Studio at Simon Fraser University produced the resulting complex work.

Listen to Androgyny

Barry Truax – Riverrun (1986), musica acusmatica di sintesi in 4 canali.

Recentemente Truax ha prodotto una revisione del brano spazializzato su 8 canali. Qui possiamo ascoltare soltanto l’edizione mixata in stereo disponibile in CD sul sito dell’autore.

Riverrun è realizzato completamente in sintesi granulare, un sistema in cui il suono, anche se sembra continuo, è composto da piccoli grani sonori la cui durata può andare da un centesimo a circa un decimo di secondo. Quando la durata dei grani è lunga (> 50 msec) è più facile distinguerli e quindi si percepisce la natura granulare del suono. Con durate comprese fra i 10 e i 30 msec (da 1 a 3 centesimi di secondo) e con grani parzialmente sovrapposti, invece, la granularità non è percepibile e si ottengono suoni continui.

La sonorità dell’insieme dipende sia dal suono dei singoli grani che dalla loro distribuzione in frequenza. La manipolazione di questi due parametri, oltre alla durata e alla densità, permette di ottenere un vasto spettro sonoro in evoluzione.

L’idea della sintesi granulare risale a Xenakis ed è stata implementata su computer da Curtis Roads nel 1978. Qui alcune note tecniche di Barry Truax.

Qui, le note dell’autore su Riverrun.

Pacific Fanfare (1996) è un breve brano di Barry Truax composto per celebrare il 25° anniversario della Vancouver New Music Society e del World Soundscape Project, di cui abbiamo parlato qualche giorno fa.

È basata su 10 “soundmarks” registrati nell’ambito del WSP vari anni prima (chi ascolta le nostre proposte sonore riconoscerà subito la sirena della nave con cui iniziava “Entrance to the Harbor” nel post di cui sopra.

Il concetto di “soundmarks” è fondamentale nel lavoro del WSP e designa quei suoni che caratterizzano un determinato paesaggio sonoro. Questi suoni riproposti in Pacific Fanfare sia nella loro versione originale che elaborata mediante riduonatori digitali (una riverberazione artificialmente colorata) e time-stretching (allungamento temporate del suono di solito senza alterazione della frequenza).

Il brano è incluso nel CD Islands, acquistabile sul sito dell’autore.

• Barry Truax – Pacific Fanfare (soundscape)