My track is here: https://soundcloud.com/plusch/spheres-in-space-disquiet0272
For this project, I constructed a self-playing Pure Data patch. When the patch was completed, I pressed “record” in Audacity and set the patch playing. After the patch turned itself off, I stopped recording, removed DC offset, normalized the audio, and trimmed silence from the start and finish.
For the frequencies and timing of the arpeggios, I used three sets of numbers that have the planetary ratios:
100, 133.333, 200, 300, 500, 800
150, 200, 300, 450, 750, 1200
300, 400, 600, 900, 1500, 2400
There was a main counter that triggered everything: the arpeggios, a 50 Hz bass note, and a noise burst. Sound sources were sine waves, sawtooth waves, and square waves. All except the bass note went through reverb and delay.