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{\Large \sf Computer Music for Percussion, Live Electronics, and CG \\ }
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{\Huge \bf CIS (Chaotic Interaction Show) \\ }
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{\LARGE \bf Yoichi Nagashima \\ }
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{\Large \bf 1993 \\ }
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{\huge {\bf CIS (Chaotic Interaction Show) } \\}
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{\large {\sf 
Computer Music for Percussion, Live Electronics, and CG } \\}
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{\bf by Yoichi Nagashima} \\
1993 \\
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\section{Performers and Media}

\subsection{Performers}
``CIS (Chaotic Interaction Show)'' is played by two members : the
percussionist, and the conductor who is also the player of live electronics.
Conductor may operate the computer system with only start command.

\subsubsection{Percussionist}
Percussionist plays the MIDI Drum Pad with improvisation, and the percussion
sounds are generated from synthesizer modules.
The internal sounds of Drum Pad are not used because the assignments of
percussion tones are frequently changed in real time by the computer system.

In this piece, the percussionist has much freedom of playing or selecting
rhythms with improvisation, because this piece is composed with
some kind of random (chaos) under the concept of {\bf real-time
Composing}.

\subsubsection{Conductor}
Conductor stands at the opposite side from the percussionist on the stage,
and plays ``wireless Power Glove'' and ``joy-stick controller'' with
conducting.
The computer system may be placed beside the conductor, and the
screen of computer display is watched for detecting the sign of
the sequence.

Conductor sends some cue to the percussionist, sends the start signal
for the next scene to the computer, plays some phrases with the cue of Chaos
Generator, and plays Granular Synthesis sound with joy-stick sensor.

\subsection{Media}
``CIS (Chaotic Interaction Show)'' is played with five types of sounds : 
electronic percossion sounds, granular synthesis, special produced sinusoid
synthesis, chaotic controlled synthesizers, and sequence controlled
synthesizers.
Two graphic computers generate interactive CG with MIDI control.

\subsubsection{System Block Diagram}
There are two notebook computer, three intelligent MIDI interface box,
two synthesizer modules including built-in some special synthesizers,
joy-stick controller and wireless power glove controller for conducting the
system.

All audio outputs of synthesizers are connected to the stereo mixer, and
the final stereo output is sent to the P.A. system.
Some effectors may be connected with the mixer.

Computer graphics are generated by two AMIGA computers.

\subsubsection{Computer and Software}
One notebook computer is NEC PC9801N with intelligent MIDI interface.
The software is simple MIDI sequencer [Micro Musician 2] of MS-DOS,
containing 16 tracks, using external MIDI clock, and software THRU.

Another notebook computer is NEC PC9801NS/T with specialized
intelligent MIDI interface.
The ``Chaos Generator'' software is originally produced by the composer,
and this software is one part of this piece.
There are 8 parallel running musical tasks, each managing independent
chaotic operation.
With conductor control, this software also manages the MIDI system
clock and real-time messages, and send cues to many musical processes.

\subsubsection{CG Computer and Software}
Both CG computers are AMIGA 2000/4000 comuters containing : 240MB HD, 16MB RAM,
``Video Toaster'', MIDI I/F, and SCSI I/F.

One software is ``Performer'' to generate bacg grounded graphics with MIDI
control sequence or trigger of color changes by the performers.

The other software is ``Bars \& Pipes'' to generate real time animation with
percussion trigger.

Both graphics are superimposed to NTSC Video signals, and projected to
the big screen behind the stage with high power video projector.
The minimum screen size is about 5 meters square.
This video signal is also displayed by two TV monitors near the performers,
and they can perform with interactivity with the graphics.

All computer graphics are produced by Yura Yasuto (JAPAN).

\subsubsection{Synthesizers and Joy-Stick Controller}
For producing chaos-generated and back-grounded sound, two Kawai
[K4r] modules are used.
Both synthesizers are set multi-timbre mode, and used as individual 4
channel MIDI sound modules.

Original two granular synthesizer modules are built into one K4r.
The parameters of granumar synthesis are real-time controlled by
specialized MIDI commands : width of grain, average density of grains,
shape of grain, compress/expand modulation of grain, panpot, volume,
joy-stick control, etc.

Original two sinusoid synthesizer modules are built into another K4r.
The parameters of synthesis are real-time controlled by specialized
MIDI commands : looping points, pitch, panpot, volume, etc.
These sounds are triggered by the chaotic phrases.

The Joy-Stick Controller is produced arranging the intelligent MIDI
interface applied with A/D converter.
This machine ganerates 2-D(X-axis,Y-axis) continuous control parameters
with specialized MIDI commands.
Conductor can send the control parameter for granular synthesis, and
can send cue to the system software with moving the stick.

The Wireless Power Glove Controller is produced arranging the NES controller
applied with wireless system and MIDI.
This machine ganerates individual 4 fingers triggers with specialized MIDI
commands.
Conductor can send cue to the system software with moving fingers.

\section{Score and Performance}

\subsection{Score}
There is not the ``traditional style'' score of ``CIS (Chaotic Interaction 
Show)''.
Performers can play freely with the ``Composition Chart''.

``Beat'' and ``Tempo'' is not important in this piece, but
to adjust each part and to make somewhat ensemble, this chart is written
with about ``1 bar = 10 seconds'', and total duration of this
piece will be about 15 minutes (total 89 bars), but the conductor can expand
the duration with delaying the cue of the next scene, and the percussionist
can expand the duration with very long ``Solo Ad lib'' part.

\subsection{Tonality Scene}
There are some blocks in this piece with each scale : 
Whole tone, Japanese, Rock, and Diatonic, called ``tonality scene''.
There are some rules for selecting notes in the piece, and this rules are
changing with the scene, and some part is written by
confused scales in order to metamorphose the tonality.

The Whole tone scene is constructed by C\#, D\#, F, G, A, B notes.
The Japanese tone scene is constructed by C\#, F, F\#, G\#, C notes.
The Rock scene is constructed by C\#, D\#, D, F, F\#, G\#, A\#, B notes.
The Diatonic scene is constructed by C\#, D\#, F, F\#, G\#, A\#, C notes.

The root key of this piece is selected as C sharp because of the title of
this piece, of cource.

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Composer's Biography : 

Yoichi Nagashima, born 1958 in Japan, has been active as a computer scientist, licenced professional engineer of Japan (information processing / electronics), musician/conductor, and composer of choral/computer music.
He is the director of ASL(Art & Science Laboratory), researcher of LIST(Laboratories of Image Information Science and Technology), and he teaches computer sound and computer music classes at some colleges.
His private project as a composer is called PEGASUS (Performing Environment of Granulation, Automata, Succession, and Unified-Synchronism) project, and he produces many original softwares, sensors, MIDI equipments, sound ganarators, and algorithm of real-time musical information processing, as one part of his composition.

Program Notes : 

This piece is written for two performers, live computer music system, and live computer graphic system.   The percussionist plays MIDI drum pad, and the conductor performs with joy-stick sensor, power-glove sensor, and control pad.
The key concepts are three : (1) Interactive musical conversation between the percussionist and the conductor, between performers and triggered/generated computer sound, and between performers and real-time generated CG displays, (2) Concept of "Chaos" to generate musical primitives as note, rhythm, scale, etc... , (3) real-time control with sensors to chaos parameters, granulation, and computer graphics.
The system for this piece are constructed with originally produced software, sensors, sound generators, and MIDI equipments as one part of the composition.   The computer graphics part of this piece is produced by Yasuto Yura.

Equipment Requirements : 

===== Requirement =====
(1) Two AMIGA 4000 Computers
   (both containing : 240MB HD, 16MB RAM, "Video Toaster", MIDI I/F, SCSI I/F)
(2) Video Projector (minimum screen size : 5 meter * 5 meter)
(3) Two Video Monitors (for Percussionist / Condoctor)
(4) Roland MIDI Drum Pad SPD-11 with stage stand
(5) MIDI Drum Machine with Pad (ex. TR-505)

===== Equipment to be brought by the composer =====
(1) Two NEC PC9801NS/T Notebook Computers (80MB HD, 6MB RAM, MSB-98N MIDI I/F)
(2) Joy-Stick Controller Sensor (original produced by the composer)
(3) Wireless Power Glove Sensor (original produced by the composer)
(4) Two Granular Synthesizers (original produced by the composer)
(5) Two Sinusoid Synthesizers (original produced by the composer)
(6) MIDI Bar Counter Display for Performer (original produced by the composer)
(7) MIDI Message Merger/Manager (original produced by the composer)
(8) Some PCM/DCF Synthesizers, Effectors (ex. K4r, SE-50, EMP100)
(9) Sub Mixer (ex. MX-8R)