Mindstorm, for two-channel digital media (2003)
Excerpt duration: 1:04 | Mindstorm was written entirely in Csound. The piece is an attempt to embed the "Golden Ratio" (1 to 1.6180339887...) into all aspects of the music: the form, frequencies of pitches, amplitude and modulation envelopes, and rhythmic groupings are all based on the proportion of the Golden Ratio. Many of the sounds found in Mindstorm were created through simple Frequency Modulation and Amplitude Modulation of sine waves, with the ratio of Carrier frequencies to Modulation frequencies at 1 to 1.6180339887 with varying modulation indices. The modulation indices were controlled by envelopes whose ratio of attack to decay were also in proportion to one another according to the Golden Ratio. |
Performance History September 26, 2006, Electronic Music Concert; University of Alabama, Tuscaloosa |
Sample Csound .orc file of a "Golden Ratio" FM Instrument ; MINDSTORM by Douglas M. O'Grady sr = 44100 ;--------------------------------------------------------------------------------- instr 1 idur = p3 krand1 randi .005, 1/.05, .8135 kamp oscili iamp, 1/idur, ienv1 afm1 foscili kamp, ifreq+kjitter, 1, 1.6180339887, kndx, 1 a1 linen afm1+afm2, .025, idur, .09 outs a1*ipan, a1*(1-ipan) endin |
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Mindstorm for two-channel digital media Registered with ASCAP |