POD & PODX* System Chronology

Institute of Sonology, Utrecht


PDP-15 version, programs POD4, POD5 & POD6

(with monophonic real-time synthesis: fixed waveform, amplitude modulation, frequency modulation)

* Note: POD stands for Poisson Distribution which was the original stochastic probability distribution (for random isolated events) that was used to determine the placement of sonic events in the original sequence of programs; when the DMX-1000 was added in 1982 (see below), the X was added to the name.


Simon Fraser University, Vancouver


Hewlett Packard 2116 version, programs POD6, PDFIL, MERGE, POD7

(with monophonic real-time FM synthesis and 1976-78, polyphonic non-realtime FM synthesis)


PDP 11/34 version, same programs plus PDMSK

(with monophonic real-time synthesis and polyphonic non-realtime FM synthesis with the Varian computer)


LSI 11/23 version established in the Centre for the Arts, SFU


LSI 11/23 version with DMX-1000, PODX system with polyphonic real-time programs
POD6X, POD7X, PDFILX, MERGE, CONDUC, FUNC, PDMSKX, PLOTX, and non-realtime program POD7

Martin Gotfrit with the LSI 11/23 & DMX-1000, ca. 1982


Real-time Granular Synthesis program added (GSX)


Real-time Granulated Sampled Sound added to granular synthesis (GSAMX)


Initial work on Motorola DSP 56001 board to be controlled by an Atari computer


Digisound-16 converter added to PODX enabling 16-bit conversion of samples to hard disk; granulation and time stretching incorporated


Demo of "Quintessence Box" real-time granular synthesis using DSP 56001 at ICMC 91, Montreal


Quintessence Box incorporating granular time stretching installed in SFU studios; prototype of a multiple-DSP board designed by Harmonic Functions, Burnaby


DM-8 box for computer-controlled diffusion demonstrated at ICMC 95 and installed in the Sonic Research Studio at SFU; digital resonators added to the signal processing modules


PODX system "retired" to the author's private studio where it continues to be compositionally productive using the DA-88 8-track recorder


Audiobox (16x16 matrix mixer) added to the system for computer-controlled diffusion

Harmonic Functions’ TiMax2 matrix mixer, marketed by Outboard Inc (UK), added to the system for computer-controlled diffusion

List of works realized with the POD and PODX systems

Octophonic work catalogue


B. Truax, "Discovering inner complexity: Time-shifting and transposition with a real-time granulation technique", Computer Music Journal, 18(2), 1994, pp. 38-48 (sound sheet examples in 18(1)).

B. Truax, "Real-time granular synthesis with a digital signal processor", Computer Music Journal, 12(2), 1988, pp.14-26.

B. Truax, "The PODX System: Interactive Compositional Software for the DMX-1000", Computer Music Journal, 9(1), 1985.

B. Truax, "Computer Music Composition: The Polyphonic POD System", IEEE Computer, 11(8), 1978.

B. Truax, "The POD System of Interactive Composition Programs", Computer Music Journal, 1(3), 1977, pp. 30-39.

B. Truax, "Some Programs for Real-time Computer Synthesis and Composition", Interface, 2, 1973.

B. Truax, "The Computer Composition -- Sound Synthesis Programs POD4, POD5 and POD6", Sonological Reports, No. 2, Utrecht State University, Institute of Sonology, 1973.