SPIRITUS SANCTUS (2013) for realtime Android Csound
Arthur B. Hunkins - arthunkins.com - abhunkin@uncg.edu

        In the beginning God created the heaven and the earth.
        And the earth was without form, and void;
        and darkness was upon the face of the deep.
        And the Spirit of God moved upon the face of the waters.

        And the Lord God formed man of the dust of the ground,
        and breathed into his nostrils the breath of life;
        and man became a living soul.
                                             Gen 1:1-2, 2:7


SPIRITUS SANCTUS is a Csound file (.csd) designed to be performed by the
Android Csound app. This app is known as CsoundApp[-xxx].apk (Csound5) or
Csound6.apk, and requires Android OS 2.3 or higher. The app is downloadable
from http://sourceforge.net/projects/csound/files/csound5/Android/ or its
neighboring csound6[.xx] directories (as Csound6.apk).

Spiritus is a meditative sonic environment - a simplified, custom, two-
"voice" version of the composer's SPIRITUS SANCTUS for Csound5 (2013). (The
latter work can also be found at http://www.arthunkins.com, accompanied by
an explanatory .htm file. Its "Spiritus2S" is the template for this Android
edition.)

There are two ways of preparing for performance, depending on whether or not
a computer is available. (Preparation is simpler if you have a computer.)

With a computer:
1) Either download and install one of the Csound.apk's mentioned above to
your Android device, or download it to your computer, copy it via thumb
drive or USB cable to your device (Download folder) and install it.
2) Download SpiritusAndroid.zip to your computer (if you haven't already)
and unzip it, then copy SpiritusAndroid.csd via thumb drive or USB cable to
a folder (perhaps the Music folder or a new Csound folder) on your device.

Without a computer:
1) Download and install your selected Csound.apk to your Android device.
2) Unless already installed, download and install the AndroZip File Manager
app from play.google.com . (Note: the WinZip app does not extract zip
archives!)
3) Directly download SpiritusAndroid.zip to your device and use AndroZip to
extract the archive to a folder of your choice (perhaps the Music folder or
a new Csound folder).

After installing the app and copying SpiritusAndroid.csd to your device,
run CSD Player (Csound 6) and Browse to (Open) this .csd and select it.

SLIDERS:
Slider 1 controls the volume of tone 1; slider 2 does the same for tone 2
(but see below).

Slider 3 controls the basic harmonic content (timbre) of both tones 1 and 2.

Slider 4 is the amplitude control for a random harmonic control that
modifies the effect of slider 3.

Slider 5 modifies the *speed* of slider 4's random "tonal modulation."

BUTTONS - selecting TONESETs (plus a "master volume control"):
You have a choice of four related TONESETs. A TONESET is two identical tones
or "notes" (tones 1 and 2) that are slightly detuned to beat against one
another. To select a TONESET, click a button from 1 to 4 (default = TONESET/
button 1).
 
Button 5 toggles between tone 2 tracking with tone 1 (slider1 controls both
amplitudes) and the two tones (sliders 1 and 2) acting independently
(default = independent). The two tones tracking together creates a
rudimentary overall volume control.

TRACKPAD:
Both trackpad parameters (x and y) control beat frequency. The x axis
determines basic beat speed; the y axis the amount of random movement added
to the basic speed. When the finger is lifted, values selected by tapping or
dragging are "held" until a new value is chosen. (Note that only one control
can be operated at a time.)

GENERAL ADVICE:
Prior to START, leave all controls at zero or default. After START, make
different initial button, trackpad and slider 3-5 selections if desired.
Sliders 1 and 2 should only be moved after any other selections have been
activated.

In case of audio glitches, reduce the value of sr (Sample Rate) in any text
editor (it is toward the top of SpiritusAndroid.csd, which is a simple text
file). Set sr progressively to 32000, 22050, 11025 or 8000 until glitching
disappears.

When left to run unabated, performance will expire in one hour.