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timebase scheme is too limited. There is no provision for a straight millisecond clock, which means that the Delay 'Timer cannot be set to always delay execution by exactly one second, for example, unless one took care to never alter the tempo of some dedicated timebase. Other timing formats should be supported, such as millisecond and SMPTE counters, as well as synchronization with external clocks through the MIDI manager. The scene shown in Fig. 1 implements a constant interaction. For any arriving note on message, middle C will be played out. Variable behavior is achieved through use of the environment 's 112 internal registers. Registers 1 through 4 are special, in that they will be set to values from incoming events. These values can then be transferred to other registers, used in arithmetic expressions or referenced in the parameter lists for any action operator. A 'Program Change' message could be used to tie a track to a sequencer, for example, by taking the program number from the input register and using that to select a track for a sequencer. The other storage option in Interactor is the 'List'. Values Recommended Books Het Apollohuis:Exhibitions,1980-1990 Het Apollohuis, Tongelresestraat 81, Eindhoven 5613 DB, the Netherlands, 1991. Art and the Future.A History/Prophecy of the Collaboration betweenScience, Technology and Art D. Davis.Praeger, New York, NY,U.S.A., 1965. AuditoryS~ Analysis Albert S. Bregman. A Bradford Book, MIT Press, Cambridge, MA,U.S.A., 1990. 773 pp., illus. Trade. ISBN: 0-262-02297-4. BrokenMusic Ursula Block and Michael Glasmeir. Berliner Kiinstlerprogramm des DAAD, Daadgalerie Berlin, Gemeentemuseum Den Haag, Magasin Grenoble, 1989. 278 pp., illus. Paper with record, $40. ISBN: 3-89357-013-6. Composition et environnements informatiques. Lescahiersde l'ircam,recherche et musique IRCAM, Paris, 1992. 188 pp., illus. Paper. ISBN: 2-0909487-02-4. ComputerApplicationsin Music: A Bibliography Computer Music and Digital Audio Series, Vols. 4 and 10. A-R Editions, Madison, WI, U.S.A., 1988 and 1991. can be stored in lists in a variety of formats and appended, deleted, counted, searched or manipulated in several other ways. Saving a document creates a file containing all its Scenes, Controls, Tracks, Lists and Symbols. If the current values of all registers are saved to a List, the complete state of the program can be saved to a file, allowing 'snapshots' of performance contexts to be maintained as desired. Interactor is a powerful and flexible environment for the development of interactive music systems. It will be useful for anyone needing to shape custom responses to musical situations. Comparisons will inevitably be drawn with Max, the Opcode graphic MIDI environment that has found widespread use owing to the same motivations that led to Interactor . Certainly there are similarities, particularly in terms of the kinds of events they handle and the power they offer for realizing compositional processes. There are important differences as well: (1) Interactor's left-toright statement construction enforces a graphic layout that is consistent and clear, (2) the use of registers and lists to convey input information and pass IV. Bibliography Computingin Musicology Walter B. Hewlett and Eleanor SelfridgeField , eds. A directory of research published annually by the Center for ComputerAssisted Research in the Humanities, 525 Middlefield Road, Suite 120, Menlo Park, CA, 94025, U.S.A. E-mail: CurrentDirections in ComputerMusicResearch M. V. Mathews and]. R. Pierce, eds. MIT Press, Cambridge, MA,U.S.A., 1989. A DictionaryofElectronic and ComputerMusic Technology Richard Dobson. Oxford Univ. Press, Oxford , 1992.224 pp., illus. Trade, $39.95. ISBN: 0-19-311344-9. DokumentationElektroakustischer Musik in Europa Golo Foellmer, Roland Franck and Folmar Hein. Produced by Technische Universitat Berlin, Elektronisches Studio, Deutsche Sektion der internationalen Gesellschaft fiir Elektroakustische Musik (DecimE); published by Inventionen '92, 1992. 370 pp. Paper. Available from TU Berlin, H51, Dokumentation, Str, des 17.juni 135, 0-1000 Berlin 12, Germany. E-mail: Fax: (49) 30-31421143. Echo:The Imagesof Sound Het Apollohuis, Tongelresestraat 81, Eindhoven 5613 DB, the Netherlands, 1986. data between operators is a significant departure from Max's patchcords and (3) the combination of sequencers and timebases in Interactor provides powerful support for the interactive performance of sequenced material. On the other...


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