Ressources.ircam

Audio and Loudspeaker setup

Software installation

For CPU performance reasons, the electronic software is split in four patches running in parallel on the same computer :

1. Partita-Deux-+3FC-08-2017.maxpat: The main patch

• score following (using antescofo)

• control of all the synthesis and transformation processes.

• The "three frequencies chord" ("3FC") is an additive synthesis patch controlled by a continuous sound analysis of the violin.

2. _P2_synful_01: Synful synthesis used to play musical sequences.

3. _P2_spat01b: hexaphonic spatialisation

4. _P2_string04: Two virtual physical model strings

_P2_synful01, _P2_spat01b and _P2_string04 are applications (built in max).

All the required applications and patches can be laung at once by executing the Partita2-max-2017/_P2-2017-run.sh script in a terminal.

files preferences:

Max file preferences should point to :

• /Partita2-max-2017/*

DSP Overview:

This diagram shows the audio routing between the applications:

The audio lines from 9 to 16 are used to communicate between the different applications. The inputs should be connected to the outputs of the audio soundboard.

You can do it :

• with an optical fiber loop.

• or as loopbacks in the TotalMix fireface software :

The patches (or applications) communicate via Open Sound Control commands through network (UDP) messages and with audio via loopback or optic fiber link on the audio card.

DSP status and IOSetup:

The IO mappings for each application should be set as shown below

Max:

• IO VS : 1024

• VS : 128

• SR : 44100

• overdrive : on

• Scheduler in audio interrupt : off

String:

Synful:

Spat:

After setting the DSP status, quit every application in order to save the settings.

System calibration and tests

test "antescofo" with the "testrecording" in "p antescofo":

On the main patch "Partita-Deux-+3FC-09-2017", select "antescofo" in the menu "go to".

(This menu contains shortcuts for easy access to important subpatches)

a window appears:

1) Click on the bang (Number 1). It resets everything in antescofo.

2) Choose a score (for example "Partita2.1.asco").

3) Choose the event you want to go to.

4) Click on play and check that it commands all other patches.

5) Calibrate antescofo by clicking in the "p calibration" in "p antescofo".

Check the toggle "Calibrate $1", the waveform must be close to 1:

Simulation test:

in "Partita-Deux-+3FC-08-2017", choose "simulation" in the "go to" menu.

This window opens:

We have done 2 recordings of the solo violin part, in "snd/filage160712" and "snd/filage170712".

• Start the follower in the antescofo window as it is explained in the "initialization routine",

• Choose "filage160712" for example (arrow number1),

• It will automatically check "play" in the simulation window(number 3), and you will see sound on the meter (number 4).

There are also markers on the recordings called "filage 170712" and "filage 160712".

To begin for example at part 2, number 50 in the score, you can choose it in the window below the file name (number 2).

The simulation violin sound is routed to dac7.

Initialization routine

Run all the patches (2) and applications (3). (see "Software installation")

Open the antescofo window located in the main patch with the "go to" menu

1. Reset antescofo by clicking on the bang between "score" and "jump to cue" (arrow number 1)

2. Choose the antescofo score "partita2.1.asco".

3. Then you can :

• "start" (arrow number 6 in System calibration and tests, test "antescofo") if you follow the musician or

• "play" (arrow number 4 in System calibration and tests, test "antescofo") if you want to play the electronic part alone without following anything.

Patch presentation

You can stop the follower by unchecking "suivi" and follow evenements manually with the space bar.

MIDI mixer Setup

Faders of the midi mixer (BCF2000) are programmed to control some parameters during the concert:

NB : There is also the possibilité to control the internal mix with mira on an ipad instead of the midi mixer.

Performance notes

For the sound engineer: The violin must be amplified throughout the whole piece except between event I.5 and event I.18 with a crescendo between I.18 and I.19.

For the Computer Music Designer:

The "Direct" fader controls also the level of the infinite reverb, it should be controlled carefully.

The level of the 3f synthesis process should be also carefully controlled with the "direct" fader during the "Perpetuum Mobile" section.

Score following (with antescofo) is automatic in most of this work except :

• event 5.1