Thanks! The number(s) you put in at start is the seed (although you'd also need to share the scale or mapping, as well as the key and range), so it will always produce the same results. Change the number and then change it back to one you already did to see this in effect. The halving steps the melody down (by whatever scale or mapping you chose below) and 3n plus one leaps it up. The bass holds odd numbers and the rhythm is the result of how many halving per leap. Here's the whole explanation: https://hailstoneharmonics.thealternativedesktopsynthesizer.garden/explained.html

jasonb

This is a really interesting experiment. It would be useful to expose the mapping between the Collatz values and the musical parameters a little more clearly—especially how the sequence controls pitch, rhythm, and bass. Having a deterministic seed/settings that can be shared would also be cool, so two people could reproduce the same generated piece and compare what they hear.