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Triune [disquiet0062-lifeofsine]

mysterybear on March 09, 2013 02:04

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    In 6 Sets

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    In 4 Groups

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    This is an entry for the Disquiet Junto project for March 7-11, 2013.

    The instructions were:
    Step 1: Devise which three sine waves you will employ. They should be different from each other in some evident way.
    Step 2: The track should open with just one of the sine waves.
    Step 3: Add the second sine wave at 5 seconds.
    Step 4: Add the third sine wave at 10 seconds.
    Step 4: Only at 15 seconds should you begin to in any way manipulate any of the source waves.

    I wrote a Csound program that generates three sine waves.
    - The first tone is a 240Hz tone that sounds for the entire piece.
    - The second tone is higher, starting at a ratio of 31/16 relative to the first tone (sharper than a major seventh, derived from the 31st harmonic).
    - The third tone is lower, at a ratio of 16/31 relative to the first tone (the reciprocal of the second tone).
    - After 15 seconds. the second tone starts gliding downwards in pitch until it reaches the ratio of 65/64 (flatter than a minor second, corresponding to the 65th harmonic).
    - Also at 15 seconds, the third tone start gliding upward in pitch until it reaches the ratio of 64/65 (again, the reciprocal of the second tone).
    - Elapsed time making the piece (not counting the time I thought about it before making it): about an hour.

    Tl;dr: starts wide, gets narrow.

    The sound file is just the output of running the Csound program, with no other manipulation. The source code is available at

    The image is from and is in the public domain.

    More on this 60th Disquiet Junto project at:

    More details on the Disquiet Junto at:

    Disquiet Junto/

    "Triune [disquiet0062-lifeofsine]" by mysterybear is licensed under a Creative Commons License


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