This is still a work in progress. I made some alterations to increase the frequency of the c and d tetrads, those at the high end of the otonal and utonal limit, and ran several more iterations through the randomizer. The tempo is slowed a bit, and it’s now about 12 1/2 minutes long. This is the 19th iteration.
The tuning is described in this post.
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Balloon Drum Music #19