Searching gestures with LPC
Neat sounds have came up while using speech signals and bowed string sounds through LPC. Ever since I met Paul Lansky a dozen or so back ICMCs, I've been intrigued about LPC. -And speaking of getting those FFTs right-, "hands on because you don't know until you try it". Paul Lansky's computer music encircle emphatic rhythmic components on most of his compositions and thus contrast with other pieces. In our chat at ICMC he surfaced core facets in LPC, but at the time I did not get all ideas. To my defense, LPC software was out of reach unless you had access to NeXT computers or DEC Mainframes. Even so, analysis and re-synthesis were slow and patience teasers, just like with the Phase Vocoder. Mid nineties' Csound will run on Macintosh II therefore enabling analysis tools for re-synthesis accessible on desktop machines.
More recently Josh Parmenter while at DxArts wrote 'ugens' implementing LPC and other analysis tools for SuperCollider based on code suggestions in Dick Moore's book EOFCM, and fast enough to bring back my attention to the subject matter. While analysis is not real time, re-synthesis and transformations can be done on the fly. A real time implementation of LPC is rt_lpc developed at Princeton by Perry Cook, Ge Wang and others. It reminds me of Paul Lansky's keynote speech at ICMC-89, Ohio State. Although I don't want to appropriate Lansky's sound on Idle Chatter or from any of his pieces, at this time it seems feasible to experiment, because on parallel layers, LPC signals are also control signals. Aside from carrier signals for amplitude modulation, FM or PM, LPC analysis is also a good pitch tracker. [2016-03-30]
What about those applications of the Fourier Transform?
On a recent discussion among new generation of spanish speaking composer/performers and lone wolf somewhat older composers, the issue of timbre's exhaustion came on [see here]. It has been seen -and listened- that recent performances and composition of young creators comprises a constrained set of sounds and timbre's manipulation techniques. One reason might be easiness and availability of real time audio processing. Young ones complain: "If we have 'rt' tools why should we explore further". Few of us were surprised that applications of the Fourier transform are unknown or seldom used by new practitioners of computer music. Therefore terminology like Convolution, Phase Vocoder, LPC, FOF, and Spectral modeling, seems Greek to many. While they know about commercial software packages, few care about the FFT. Is this good or bad, an answer rather lies in the domain of aesthetics. FTR, these notes are being written while waiting for the LPC analysis of a sound file. [2016-02-20]
TikiTik performed on TeleMAMM _@_ Radical Chamber
TikiTik performed on TeleMAMM at Radical Chamber series (cámara radical) on the Modern Art Museum of Medellin (MAMM). Telepresence for this piece featuring Elena Fuentes(violin), Simón Castaño(water flute), Miguel Vargas(armonica) and Andrés Sampedro(IT & systems-ad bureaucracy). This tele-concert -first of its class in a private museum on these latitudes-, also featured Simón Castaño's Canción de Mantas for distributed ensembles, Mario Valencia's Mirror for remote percussionists, and Terry Riley's In C. Oscar Ceballos at Caldas University in Manizales(UdeC) and Fernando Mora at Antioquia Univestity in Medellín(UdeA) conducted ensembles consisting of guitars and electric guitars in addition to flutes and percussion. Mario Valencia, Sebastian Castaño and Fernando Mora developed and implemented a MAX/Jitter patch for close-to-real-time visuals among the three remote locations of the concert, namely UdeA, UdeC and MAMM. Jacktrip on Linux and Mac was used for audio over UDP and to connect all concert's sites. Audio system at MAMM featured a second-order Ambisonics setup. [2015-11-24]
Restoring old compositions "A curious Character" (curioso caracter)
Some Ampex 456 tapes were baked in order to rescue "Curioso Caracter", a Musique Concrete piece done in the early nineties and dedicated to maverick educator Ernesto Bein. At the time a Sony TCD-D10 PRO DAT digital recorder with a stereo microphone was borrowed to record source material at "El Moderno", a school in Bogota on the middle of the prestigious neighborhood of El Nogal. Nevertheless most signal processing was analog using tape manipulation techniques on MCI Recorders and AKG Reverberation plate and spring units. Sound sources for this piece were those of the school between 10:00AM and 12:30PM back in 1990. Worth to point out were bell sounds coming from a nun cloister next to the school which indicated 30 minute intervals. In addition to boys' voices there were pigeon sounds and bird singing. This school housed pigeons in a 'palomar' feeding them every day at 10:00AM. Some of the captured material is taken from students doing these feedings. "Curioso Caracter" though Musique Concrete, today might be tagged as a "Soundscape". [2015-09-15]
A telematic art exhibit and gathering including teleconcerts, installations, and workshops. Among participants Jacktrip developer Juan Pablo Caceres, trombonist and UC Irvine Music Dept. chair Michael Dessen and telematic arts maverick Chris Chafe. Teleconcerts included works by José Gallardo, Juan Pablo Caceres, Bruno Ruviaro, Juan Reyes and Hector Fabio Torres. Organized by Juan Reyes and Mario Valencia. [2015-05]
A multiphonic computer music using eight channels et Ambisonics for live telematic performances.
'Os Grilos' for Scanned Synthesis and second-order Ambisonics was programmed at one of the concerts at the Triple CCRMAlite venue. John Chowning encouraged Juan Reyes on keep working on this type of synthesis. See more of the story at the program notes. Thanks a lot to Eoin Callery and Nette Worthey for their support and encouragement. [2014-10]
A Multichannel second-order Ambisonics computer music using Bill Verplank's and Max Mathews' Scanned Synthesis.
Research on implementation of delays and moving sound sources with application to the Leslie speaker. ChucK, Scheme and Lisp code that implements Smith, Serafin, et al, "Doppler simulation and the Leslie", Web page [here].
Tele Espacios Activos I
Grain of salt to 2014's International Festival of Image in Manizales, Colombia. First rendition of Tele Espacios Activos featured a teleconcert with performances between Manizales and Stanford, and between Manizales, Cali and Medellín, Colombia. Natalia Castellanos (at U. de Caldas) and Juan Reyes (at Stanford) had a tele performance of Reyes' Open Spaces on this venue.
Joined performers and composers from around the world. While main stage was at Stanford's Bing auditorium, there were other stages around the planet. Tele-espacios Abiertos was performed by Zhengshan Shi at Bing as well as Lilian Campesato and Julian Jaramillo in Sao Paulo and Daniel Osorio, Mario Valencia and Juan Reyes in Manizales. View concert performance.
A composition for telematic performance as well as a video sound installation. Sound sources and material come from physical models of banded waveguides, namely a model of the Tibetan singing bowl programmed by the composer. More about banded wageguides on Georg Essl's web page.
Invited to Arcured in Barranquilla Colombia. Arcured is a network of culture and arts conformed by members of academic institutions affiliated to Red Clara throughout Latinamerica. This conference aimed to professors and artists focused on new network technologies applied to the arts. Gave a talk on Group Interaction and Telepresence at Simon Bolivar University. Also a performance of Computer Music concert at MAMB, Museo de Arte Moderno de Barranquilla and a Colombian Tele-concert featuring Cuatro25 Orejas for piano, electronics and visuals with performers at Icesi Univerity in Cali, Caldas University in Manizales and Juan Reyes at the piano at Universidad Autonoma in Barranquilla.
Congreso Internacional de Artes del Caribe
Invited talk at the Caribbean Art Congress at Cartagena, Colombia. Organized by the School of Arts of Bolivar and University of Antioquia, this congress was a gathering to reflect on art and technology. Subject of this talk focused on spontaneity on music performance and the arts.
A celebration of John Chowning's return to Bogota this time at Javeriana University. This venue was a four(+) days gathering and included talks and a composer's colloquium in addition to Maureen and John Chowning's concert and a telematic performance of John Cage's Four6 between Bogota, Sao Paulo and Stanford. This venue was organized by Ricardo Escallon and Juan Reyes.
FLAMIM or Latinamerican forum for new musical interfaces inside frameworks of Diseño(+) at Icesi University in Cali, Colombia. Joined Wendy Ju, and fellow colleagues Michael Gurevich and Jaime Oliver for panels, workshops and discussions on the subject matter of music interaction. Part of this forum included a teleconcert (first of its kind using advanced networks in Colombia), with performers at University of Michigan, Stanford University and Icesi University. Performers included Stephen Rush and his Digital Ensemble at Ann Arbor, Chris Chafe, Roberto Morales, Rob Hamilton, et al, at Stanford, as well as Jaime Oliver, Michael Gurevich, Daniel Gomez, Juan Reyes and others at Icesi. Other performances at FLAMIM featured a new realization of John Cage’s Rozart Mix in honor of the composer’s centennial directed by Michael Gurevich. Program also featured Juan Reyes' Oranged (lima-limón) for multi-channel tape. This venue was organized by Maria Clara Betancourt, Daniel Gomez and Juan Reyes.
An electronic arts exhibit with Colombian artists at Caraffa Museum in Cordoba, Argentina. On the program there was a live performance of Horace in San Mateo and improvisation on piano of Cuatro25 Orejas for piano and live electronics at La Cúpula Gallery. Venue curated by Jorge Castro and supported by the Alzate Avendaño Foundation of Colombia.
A realtime algorithmic computer music and live electronics piece for "Fender Rhodes" (if possible) and pianoforte Sounds. The piece follows on the spirit of the augmented ninth dominant or plus eleventh chords seldom used by pianist Horace Silver on several of his compositions.
This is a sound installation as well as an eight-channel tape music composition. In this piece sounds travel a path inside a boxed environment obtained by Lissajous patterns applied to intensity panning on each source.
A sound art exhibit featuring Chuchoter as well as other works from various artists it the Museum of Modern Art of Bogota. This exhibit also featured talks on the subject matters of computer music and new ways of expression and performance.
A sound art exhibit featuring FtheF for visuals and modeled bowed strings and artificial performer. This is a multichannel composition and sound space intervention. Sound sources come from the physical model of the bowed string.
This is a new rendition of the original ``Freddie the Friedlander'' for physical model of the bowed string plus artificial performer. This version adds visuals and color in an attempt to image-by-synesthesia fabrication.
This is an algorithmic miniature piece for sound samples of saxophone. In its code the algorithm pursues J. C. Risset's rhythmic paradoxes, which in this case give the illusion of an ever lasting accelerandi o decrescendi. This piece is dedicated to music education advocate and winds performer Terry Mohn.
This is a course offered for students interested in symbols, semantics and grammars of gesture on various domains. Initially conceived for music performance students have also found applications on visual and space arts as well as dance and body art.
Not too recent but current:
A tutorial for electroacustic composition or sound art production 'en español'. Used on several workshops at Universities and institutions throughout Latinamerica.