This is an entry for this week’s Disquiet Junto project
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).
The sound file is just the output of running the Csound program, with no other manipulation. I will be happy to send the Csound source code for this piece to anyone who would like a copy.
The image is from http://en.wikipedia.org/wiki/File:SierpinskiTriangle.PNG and is in the public domain.
More on this 60th Disquiet Junto project at:
More details on the Disquiet Junto at: