Tune Toys : Expresso

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Expresso takes a simple musical expression (literally "X") and mutates it. In each generation, transformations are applied to components of the expression. This is a fractal technique known as an L-system. The more generations there are, the larger and more complex the expression gets (and the longer it can take to compute). The output varies wildly, from boring to fascinating. Press "Mutate" a few times till you get something that looks interesting, then click on the image to play it. See Composer's Quarry for examples of output.

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After 19 generations the expression "X" became this:

((((((((transpose((transpose(transpose(transpose(step(((echo(transpose(X,4) ,4,6) |step(transpose(X,4) ,12) ) +((X+X) +transpose(X,12) ) ) ,12) ,-7) ,-7) ,-7) |transpose(shuffle(transpose(transpose(((X|X) +transpose(X,7) ) ,4) ,-5) ) ,-5) ) ,4) +transpose(((((transpose((((transpose(transpose(transpose(X,4) ,-5) ,4) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) +transpose(step(X,12) ,4) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,4) ,4) ,7) ) ,-7) |(((X|shuffle(X) ) +transpose((arpeggio((X|X) ) +(X+(X+X) ) ) ,7) ) +transpose(((((echo(X,4,6) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,4) ,7) ) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(((transpose(X,4) +transpose((X|echo(X,4,6) ) ,7) ) |shuffle(arpeggio(X) ) ) ,12) ) ,12) ) ) +transpose(transpose(echo(arpeggio(transpose(transpose(X,4) ,-5) ) ,4,6) ,4) ,12) ) +transpose(step(((step(arpeggio((X+X) ) ,12) +(X+((X+transpose(X,4) ) +transpose(X,7) ) ) ) |(echo(transpose(X,-5) ,4,6) |arpeggio(X) ) ) ,12) ,4) ) +(transpose((((transpose(step((((transpose(X,-5) +transpose((transpose(shuffle(X) ,4) +((transpose(X,4) |transpose(X,-7) ) +(echo(X,4,6) +transpose(X,12) ) ) ) ,4) ) +transpose(((X+X) |((X|X) |step(echo(X,4,6) ,12) ) ) ,7) ) |transpose(X,-5) ) ,12) ,-7) +transpose(echo(((((((step(X,12) +X) +transpose(transpose(X,4) ,12) ) +shuffle(arpeggio(transpose((X+transpose(X,12) ) ,-7) ) ) ) +((X+transpose(X,4) ) |((transpose(((X|X) |(X|X) ) ,4) +transpose((transpose((X|X) ,-7) +transpose(transpose(X,4) ,-5) ) ,4) ) +transpose(step((X+X) ,12) ,7) ) ) ) +transpose((arpeggio(X) +transpose((step((X+transpose(X,12) ) ,12) +transpose(transpose(step((X+transpose(X,12) ) ,12) ,4) ,12) ) ,7) ) ,4) ) +transpose((((echo(X,4,6) +transpose(transpose(X,-5) ,7) ) +transpose((X|X) ,4) ) +transpose(((X+transpose((step(X,12) +transpose(X,12) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,7) ) ,4,6) ,4) ) +transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,7) ) |step(transpose((transpose(transpose(transpose(transpose(X,-5) ,4) ,-7) ,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ,12) ) ,-5) +transpose(((transpose((transpose(X,-5) +(X+X) ) ,-5) |transpose(transpose(transpose((X+transpose(X,-5) ) ,-5) ,-5) ,4) ) |transpose(((((((X|(X+transpose(X,7) ) ) +echo(transpose(X,-5) ,4,6) ) +transpose((X+transpose(shuffle(X) ,12) ) ,4) ) +transpose((((X+transpose(transpose(arpeggio(X) ,-5) ,4) ) +transpose((X+arpeggio(X) ) ,7) ) +transpose(transpose(echo(X,4,6) ,-7) ,12) ) ,7) ) +transpose((echo((transpose(transpose(X,-5) ,-5) +transpose((X+X) ,-5) ) ,4,6) +step((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) |X) ,12) ) ,4) ) +transpose((((echo(X,4,6) +transpose(transpose(step(transpose(X,4) ,12) ,-7) ,4) ) +transpose(X,7) ) |((X+echo(X,4,6) ) +((X|arpeggio(X) ) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ) ) ,7) ) ,-5) ) ,-5) ) ) ,4) ) +transpose((transpose((transpose((step(X,12) +transpose((X|X) ,-7) ) ,-5) |echo(transpose(X,-7) ,4,6) ) ,-7) +transpose(transpose((transpose(step(step(shuffle((X|X) ) ,12) ,12) ,4) +transpose(((transpose(echo(transpose(((X+transpose(X,7) ) |step(transpose(X,-5) ,12) ) ,-7) ,4,6) ,-7) +transpose(transpose((arpeggio(transpose(step(X,12) ,4) ) +((transpose(X,4) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ) ,-7) ,4) ) +transpose((((arpeggio(X) +(X+transpose(X,7) ) ) +transpose(transpose(X,-5) ,4) ) +transpose((X|transpose(X,-5) ) ,7) ) ,7) ) ,7) ) ,-7) ,12) ) ,7) ) +(transpose(((((step((transpose(transpose(X,4) ,-7) +transpose((X+X) ,12) ) ,12) |transpose((arpeggio((X+transpose(X,12) ) ) +transpose(((X|X) +transpose(arpeggio(X) ,12) ) ,12) ) ,4) ) +transpose((transpose(((X|transpose(transpose(X,-7) ,-5) ) |step(X,12) ) ,-7) +((((X+shuffle(X) ) |(X+transpose(X,-7) ) ) +transpose(((transpose(transpose(X,-5) ,-7) +transpose((X|X) ,4) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) ,7) ) +(((step(X,12) |X) +transpose(X,4) ) +transpose((X+transpose(((X+transpose(X,12) ) +X) ,12) ) ,7) ) ) ) ,12) ) +transpose((transpose(((shuffle(X) |X) +X) ,-5) |echo((((X+transpose((X+X) ,4) ) +transpose(X,7) ) |(shuffle(X) +X) ) ,4,6) ) ,7) ) +transpose(((((X+transpose((X+X) ,7) ) +transpose(((X+transpose(X,7) ) +echo(X,4,6) ) ,12) ) |((X+transpose(transpose(X,-5) ,12) ) |X) ) |transpose(transpose(((transpose(X,-5) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,-5) ,4) ) ,7) ) ,-5) +transpose(echo(((transpose(transpose(shuffle((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +(transpose(X,4) +transpose((X+X) ,12) ) ) ) ,4) ,-5) +transpose(((((((X+X) +X) +transpose((X|(X+X) ) ,7) ) |echo(shuffle((transpose(X,-5) +(X+X) ) ) ,4,6) ) +transpose(transpose(transpose(echo(X,4,6) ,-7) ,-5) ,4) ) +transpose(echo((((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(arpeggio(X) ,-7) ) ,4,6) ,7) ) ,4) ) +transpose(transpose((shuffle(((X+transpose(X,12) ) +transpose(transpose(X,-5) ,7) ) ) |transpose((X+transpose(X,12) ) ,-7) ) ,4) ,7) ) ,4,6) ,12) ) ) +transpose(((shuffle(transpose((step(arpeggio(transpose(transpose(step(((arpeggio(step(X,12) ) +transpose((X+transpose(X,7) ) ,7) ) |transpose(echo(X,4,6) ,-7) ) ,12) ,4) ,-7) ) ,12) |step(transpose(((shuffle(transpose(transpose(X,4) ,-5) ) +transpose((echo(transpose((echo((X+transpose(X,7) ) ,4,6) |X) ,-7) ,4,6) +transpose(transpose(X,-5) ,-5) ) ,4) ) +transpose((shuffle(X) +((transpose(X,-5) +echo(X,4,6) ) |(X|X) ) ) ,7) ) ,-7) ,12) ) ,-5) ) +transpose(transpose(arpeggio(((((transpose(arpeggio(step(transpose(X,4) ,12) ) ,-7) +transpose((transpose(((echo(transpose(transpose(X,4) ,4) ,4,6) +transpose(transpose(X,4) ,4) ) +transpose(((((X+transpose(X,7) ) +(X|X) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ,7) ) ,4) +transpose(echo(X,4,6) ,-5) ) ,7) ) +shuffle((transpose(step((transpose(X,-7) |shuffle(X) ) ,12) ,-7) +transpose((transpose((X+transpose(X,7) ) ,-5) +step((echo(((shuffle(X) +echo(X,4,6) ) +(X|X) ) ,4,6) |((X+X) +transpose(transpose(X,-5) ,12) ) ) ,12) ) ,7) ) ) ) +transpose(transpose(step((transpose(transpose(transpose(((X|X) +transpose(X,7) ) ,-5) ,-5) ,-7) +(((X|X) +echo(X,4,6) ) |step(X,12) ) ) ,12) ,-7) ,12) ) +(transpose(transpose(((arpeggio(transpose(X,4) ) +transpose(shuffle(X) ,4) ) +transpose((((((X+transpose(shuffle((X+transpose(X,7) ) ) ,4) ) +transpose((X+X) ,7) ) |arpeggio((X+transpose(X,7) ) ) ) +transpose((transpose(transpose(X,-7) ,-5) |transpose(step(X,12) ,4) ) ,4) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) ,7) ) ,4) ,-5) +transpose(((shuffle(((X+transpose((X+X) ,7) ) |transpose(X,-7) ) ) |(step((X+transpose(X,7) ) ,12) +transpose(step(transpose(X,-7) ,12) ,12) ) ) +transpose(transpose(step(((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ,4) ,12) ) ,-5) ) ) ) ,-7) ,4) ) +transpose(transpose((echo((((step((transpose(transpose((transpose((echo(X,4,6) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,7) ) ,12) ) ,4) +transpose(((((X+X) |step(X,12) ) +transpose(transpose(transpose(X,-5) ,-7) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,7) ) ,12) ) ,-7) ,-7) +transpose((transpose((((transpose(transpose(transpose(X,4) ,-7) ,-5) +transpose(transpose((((X|X) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,-7) ,7) ) +transpose(echo(shuffle(X) ,4,6) ,4) ) +transpose(((X+transpose(X,-5) ) +transpose(((X+transpose((X+X) ,12) ) |X) ,7) ) ,7) ) ,4) +transpose((((((X+X) +transpose((X+transpose(X,7) ) ,12) ) +transpose(((transpose(((X+transpose(X,12) ) |transpose(X,4) ) ,-5) +transpose((X+(X+X) ) ,4) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ,12) ) +transpose(step((echo(arpeggio(arpeggio((X|X) ) ) ,4,6) +transpose(step(transpose(X,-7) ,12) ,7) ) ,12) ,4) ) +transpose(echo((step(X,12) +transpose((X+transpose(X,12) ) ,12) ) ,4,6) ,7) ) ,7) ) ,7) ) ,12) +transpose(echo(((((transpose(transpose((((((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose((X|X) ,-5) ,7) ) +transpose((transpose(X,-7) +transpose((X+X) ,7) ) ,4) ) +transpose(((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,7) ) ,-5) ,4) +transpose(shuffle(echo(transpose(X,4) ,4,6) ) ,4) ) +transpose((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +(step(X,12) +X) ) |(((X|X) |X) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |arpeggio(X) ) ,12) ) ) |arpeggio(transpose(transpose((X|X) ,-7) ,4) ) ) ,7) ) +(step((arpeggio(X) +((X+X) +X) ) ,12) +step(transpose(transpose(X,4) ,-5) ,12) ) ) |(transpose(((X+(X|X) ) |transpose((arpeggio(X) +transpose(X,-5) ) ,-5) ) ,4) |shuffle(arpeggio((echo(X,4,6) |(arpeggio(X) +transpose(transpose(X,-5) ,7) ) ) ) ) ) ) ,4,6) ,12) ) +transpose(((((echo((X+transpose(transpose(X,4) ,12) ) ,4,6) +(((X+X) +transpose((transpose((X+transpose(X,7) ) ,-5) +transpose((X+(X+transpose(X,7) ) ) ,7) ) ,7) ) +transpose(X,-5) ) ) +((arpeggio((X+transpose(shuffle(X) ,12) ) ) +transpose((step((X+X) ,12) |((X+transpose(transpose(X,4) ,4) ) +transpose(shuffle(X) ,7) ) ) ,4) ) +transpose((shuffle(transpose(X,4) ) +step(arpeggio(X) ,12) ) ,7) ) ) +transpose(arpeggio(arpeggio((((transpose(X,4) +transpose((X+transpose(X,7) ) ,12) ) +transpose((X+X) ,12) ) +transpose(((((X+X) |(transpose(X,-5) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose(arpeggio(X) ,4) ) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) ,7) ) ) ) ,7) ) +transpose(transpose((shuffle(((transpose(echo(transpose(X,4) ,4,6) ,4) +transpose(step(shuffle(X) ,12) ,4) ) +transpose((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) ,7) ) ) +transpose((arpeggio((transpose(X,-5) +transpose(transpose(X,-5) ,-7) ) ) +X) ,-7) ) ,-7) ,7) ) ,4) ) +transpose(transpose(transpose(arpeggio(transpose(((X+transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) ,-7) ) ,-5) ,-5) ,7) ) ,4,6) |transpose(transpose(shuffle((shuffle((((transpose((transpose(X,-5) +(shuffle(X) |transpose(X,-5) ) ) ,4) +transpose(transpose((step(X,12) +((X+X) +(X+X) ) ) ,-5) ,4) ) +transpose((X+(X|X) ) ,7) ) +step(transpose((transpose(transpose(X,4) ,4) +transpose(shuffle(shuffle(shuffle(X) ) ) ,7) ) ,4) ,12) ) ) +transpose((arpeggio(transpose((transpose(X,4) +transpose(X,4) ) ,-7) ) +transpose(((shuffle((transpose(X,4) +transpose((X+transpose(X,7) ) ,12) ) ) +((shuffle(transpose(step(X,12) ,-5) ) |echo(arpeggio(transpose(X,-7) ) ,4,6) ) +X) ) +(transpose(transpose(transpose(transpose(X,4) ,4) ,-7) ,4) |(((X+X) |(arpeggio(transpose(X,-7) ) +transpose(step(step(X,12) ,12) ,7) ) ) |transpose((X|(transpose(arpeggio(X) ,-7) |X) ) ,-7) ) ) ) ,12) ) ,7) ) ) ,4) ,4) ) ,-5) ,7) ) ,4) ) +transpose(transpose(transpose(step(transpose((arpeggio((transpose(echo(((X+X) |shuffle(X) ) ,4,6) ,-5) +transpose((transpose(transpose((X+X) ,-7) ,4) +(transpose(transpose(X,-5) ,4) +(X+X) ) ) ,12) ) ) +(((((transpose((X+transpose(X,12) ) ,-7) +arpeggio(transpose((X+echo((X|X) ,4,6) ) ,-7) ) ) +arpeggio((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) +(X+X) ) ) ) +(((((arpeggio(transpose(X,-5) ) +(((X+transpose(X,12) ) +transpose(X,-7) ) +transpose(step(X,12) ,4) ) ) +transpose(shuffle(transpose(X,-5) ) ,4) ) +transpose((((X+transpose(X,7) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,4) ,4) ) +transpose(arpeggio((X+X) ) ,7) ) ,7) ) +((transpose(transpose(X,4) ,-7) +(echo(X,4,6) |transpose(X,-5) ) ) |echo(echo(transpose(X,-5) ,4,6) ,4,6) ) ) |transpose((shuffle(X) +transpose(transpose(shuffle(X) ,4) ,12) ) ,4) ) ) |echo(step(transpose(((transpose(transpose(X,-7) ,4) +transpose(step((step(X,12) +transpose(X,12) ) ,12) ,4) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) ,4) ,12) ,4,6) ) +((echo((transpose(((X+transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) ,-5) |echo((arpeggio(X) +transpose(echo(X,4,6) ,-5) ) ,4,6) ) ,4,6) +transpose(transpose(transpose(transpose(transpose((X+X) ,-5) ,-5) ,-5) ,-7) ,4) ) +transpose((((transpose(transpose(transpose(shuffle(X) ,-5) ,-5) ,-5) +transpose(step(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(X|X) ) ,-7) ,12) ,7) ) +transpose(((transpose(transpose((transpose(echo(X,4,6) ,4) |transpose(arpeggio(X) ,4) ) ,4) ,-7) +transpose((transpose(((transpose(X,-7) +transpose(transpose(X,4) ,12) ) +transpose(X,7) ) ,-7) +transpose((((X|X) +transpose(((X|X) +X) ,7) ) |((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) |(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) |transpose(X,-5) ) ) ) ,7) ) ,4) ) +transpose(((arpeggio(X) +transpose(step(X,12) ,12) ) +transpose(step(transpose(((X|X) +transpose(X,12) ) ,-5) ,12) ,12) ) ,7) ) ,4) ) +transpose((transpose((transpose(step(X,12) ,-7) +transpose(arpeggio(echo(X,4,6) ) ,12) ) ,-7) +((arpeggio(X) +transpose((X+transpose((X+X) ,4) ) ,7) ) +echo((transpose(transpose(X,-5) ,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4,6) ) ) ,7) ) ,7) ) ) ) ,-5) ,12) ,-5) ,-7) ,7) ) +transpose(((transpose(transpose(transpose(((shuffle(transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,7) ) +transpose(step(X,12) ,7) ) +transpose((transpose(step(X,12) ,4) |arpeggio((X+X) ) ) ,4) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) ,-7) ) +((shuffle((X+X) ) +arpeggio(step(X,12) ) ) +transpose(((X|X) +transpose((X+transpose(transpose(X,-5) ,12) ) ,12) ) ,7) ) ) +transpose(arpeggio(shuffle((transpose(X,-7) +(X|X) ) ) ) ,12) ) ,4) ,4) ,4) +step((((echo(transpose((((((((X+transpose(X,12) ) +X) +(transpose(echo(X,4,6) ,-7) +transpose(((X+transpose((transpose(X,-5) |X) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) ,7) ) ) +transpose(((transpose(echo(transpose(X,-7) ,4,6) ,-7) +transpose((transpose(arpeggio(X) ,-5) |transpose((X+X) ,4) ) ,4) ) +transpose((((((X+X) +(X+X) ) +transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,12) ) +transpose((transpose(X,4) |X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,7) ) |echo((transpose(X,4) |transpose((((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4) ) ,4,6) ) +transpose((step(arpeggio(X) ,12) +transpose(transpose((transpose(transpose(X,-7) ,4) +echo(arpeggio(echo(X,4,6) ) ,4,6) ) ,-7) ,-7) ) ,4) ) +transpose(echo(arpeggio((echo((X|X) ,4,6) +transpose(transpose(X,-5) ,7) ) ) ,4,6) ,7) ) ,4) ,4,6) |((((transpose(X,-5) +transpose((X+transpose(X,7) ) ,12) ) +transpose(shuffle(X) ,4) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) |echo(((shuffle(transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,4) ,-7) ,4) ) +transpose(echo((transpose(X,-7) |echo(X,4,6) ) ,4,6) ,7) ) ,4,6) ) ) +transpose((echo((((((transpose(((((X+transpose(X,7) ) +transpose(X,-5) ) +transpose((echo(X,4,6) +transpose(arpeggio(X) ,12) ) ,4) ) +transpose(transpose((X+X) ,-5) ,7) ) ,-7) +((((X|echo(X,4,6) ) +transpose((((X+X) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) +transpose(transpose((X+X) ,-7) ,4) ) +transpose((((X+X) +X) +transpose(transpose(X,-7) ,12) ) ,7) ) ) +step((transpose(transpose(X,4) ,-5) +transpose((transpose(X,4) |X) ,12) ) ,12) ) +transpose((((arpeggio((((X+transpose((X+transpose(X,7) ) ,7) ) +transpose(((X+X) +transpose(X,12) ) ,4) ) +transpose(X,7) ) ) +transpose((transpose(arpeggio(X) ,-7) |((X+X) +((X|X) +transpose(transpose(X,-7) ,12) ) ) ) ,12) ) +transpose((transpose(step(X,12) ,-7) +transpose(transpose(echo(X,4,6) ,-5) ,12) ) ,4) ) +transpose(((arpeggio(transpose(X,4) ) +transpose(transpose(X,-7) ,12) ) +echo((X+transpose(X,12) ) ,4,6) ) ,7) ) ,4) ) +transpose(transpose((X+transpose(X,-5) ) ,-7) ,7) ) +((arpeggio(transpose((X+((X+transpose(X,7) ) +transpose((X+X) ,12) ) ) ,-5) ) +transpose(step(((transpose((transpose(transpose(X,4) ,-5) |X) ,-5) |step(echo(transpose(transpose(X,4) ,-7) ,4,6) ,12) ) +transpose(arpeggio(transpose(X,4) ) ,7) ) ,12) ,12) ) +transpose((arpeggio((X+X) ) +transpose((((X+transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-7) ,7) ) |echo(X,4,6) ) ,7) ) ,7) ) ) ,4,6) +transpose(transpose(echo(arpeggio(arpeggio(transpose((transpose(X,4) +transpose((transpose(X,4) +transpose(X,7) ) ,-5) ) ,-7) ) ) ,4,6) ,-7) ,12) ) ,4) ) +transpose(transpose(shuffle(transpose(echo(transpose(transpose((step(transpose(echo((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,4,6) ,-5) ,12) |transpose(transpose(((transpose(X,-5) +transpose(transpose(X,-7) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) ,-7) ) ,-7) ,4) ,4,6) ,4) ) ,-5) ,7) ) ,12) ) +transpose(((arpeggio(((transpose(transpose(((X+transpose(X,4) ) +transpose((X+X) ,7) ) ,4) ,-5) +transpose((transpose(arpeggio(step((X+transpose(X,7) ) ,12) ) ,-5) |((echo(((X+transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,4,6) +transpose(((X+X) |arpeggio(transpose(X,4) ) ) ,4) ) +transpose(transpose(((X|X) +transpose(shuffle(X) ,7) ) ,4) ,7) ) ) ,4) ) +transpose(transpose((echo(shuffle(X) ,4,6) +transpose(transpose(shuffle(shuffle(X) ) ,-5) ,7) ) ,4) ,12) ) ) |((transpose(echo(arpeggio(transpose(((shuffle(X) +transpose(echo(X,4,6) ,12) ) |echo(arpeggio(X) ,4,6) ) ,4) ) ,4,6) ,-7) +transpose((echo(transpose((echo(arpeggio(transpose(X,-7) ) ,4,6) |echo(X,4,6) ) ,-5) ,4,6) +transpose((transpose(echo(echo(transpose(X,-7) ,4,6) ,4,6) ,4) +(echo(((X+transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) ,4,6) +transpose(((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose((X+X) ,-7) ,12) ) |(transpose(arpeggio(X) ,-7) +transpose((X|X) ,7) ) ) ,12) ) ) ,12) ) ,4) ) +transpose(shuffle(transpose(arpeggio(transpose(step(X,12) ,4) ) ,-5) ) ,7) ) ) +transpose((transpose((((((((arpeggio((X+transpose(X,12) ) ) +((X+X) |transpose(X,-5) ) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(step(transpose(X,-5) ,12) ,7) ) +transpose(transpose(transpose((X+X) ,4) ,-7) ,4) ) +transpose(shuffle(arpeggio((X+transpose(X,7) ) ) ) ,7) ) |transpose(((transpose(X,4) +transpose((X|X) ,7) ) +transpose((transpose(X,-7) +X) ,12) ) ,-5) ) +transpose(((echo(transpose(echo(X,4,6) ,-5) ,4,6) +transpose((transpose((((X+transpose((X|shuffle(X) ) ,4) ) +transpose((echo(X,4,6) |X) ,7) ) +transpose((transpose(X,-5) +arpeggio(shuffle(X) ) ) ,12) ) ,4) |(transpose(transpose(X,-5) ,-5) +(X+((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ,4) ) +transpose(step(arpeggio(arpeggio(((echo((step(X,12) +arpeggio(X) ) ,4,6) +transpose(transpose(X,4) ,4) ) +transpose((((X+transpose(X,7) ) +X) +X) ,7) ) ) ) ,12) ,7) ) ,12) ) ,4) |transpose(((((arpeggio((X|X) ) +transpose(X,12) ) +transpose((shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) +transpose(X,-5) ) ,7) ) +transpose(transpose(transpose(transpose(((shuffle(X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ,-5) ,-5) ,4) ) +transpose(transpose((transpose(X,-7) +((X+transpose(X,12) ) +transpose(transpose(X,4) ,12) ) ) ,-5) ,7) ) ,-5) ) ,12) ) ,12) ) ,4) ) +transpose(step(transpose((step((echo((((transpose((echo(X,4,6) +transpose(X,12) ) ,-5) +transpose(shuffle(transpose(X,4) ) ,7) ) +echo((transpose(X,-7) +transpose((X+X) ,7) ) ,4,6) ) +transpose(step((step((X+X) ,12) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) ,12) ,12) ) ,4,6) +echo(((transpose(transpose(X,-7) ,-7) |(transpose(X,4) +(X+X) ) ) |((echo(transpose(X,-5) ,4,6) |transpose(echo(X,4,6) ,-7) ) +transpose(transpose(transpose(X,-5) ,-5) ,-5) ) ) ,4,6) ) ,12) |((transpose(echo(arpeggio((X+transpose(X,12) ) ) ,4,6) ,-5) +echo(transpose(((X+transpose(X,7) ) +X) ,-7) ,4,6) ) +transpose(transpose((transpose(echo(X,4,6) ,-7) |(step(transpose(transpose(X,-5) ,4) ,12) +transpose(((X+transpose(X,12) ) +(transpose(X,4) +shuffle(X) ) ) ,7) ) ) ,4) ,7) ) ) ,4) ,12) ,7) ) +transpose(transpose(shuffle((((step((((shuffle((step(X,12) +transpose(step((X|X) ,12) ,7) ) ) +arpeggio(transpose(step(X,12) ,4) ) ) +transpose(((transpose(X,4) |echo(transpose(X,-5) ,4,6) ) +step(((transpose(shuffle((echo(X,4,6) +transpose(X,4) ) ) ,-7) +echo(echo(arpeggio((X+X) ) ,4,6) ,4,6) ) +((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) |(transpose(X,-5) +transpose(step(X,12) ,12) ) ) |(X+transpose(shuffle(X) ,12) ) ) |(X+transpose(transpose(step(X,12) ,-5) ,12) ) ) ) ,12) ) ,-5) ) |transpose(shuffle((((((transpose(X,-7) +transpose(transpose(X,-5) ,7) ) +transpose(echo((((X+transpose(X,-5) ) +transpose(echo(transpose(X,4) ,4,6) ,12) ) |transpose(transpose(X,-7) ,4) ) ,4,6) ,4) ) +transpose(transpose(((X|X) +X) ,-5) ,7) ) +transpose(transpose(arpeggio((((step(X,12) |step(X,12) ) +transpose((arpeggio(X) +(shuffle(X) +X) ) ,4) ) +transpose((X|X) ,7) ) ) ,4) ,4) ) +transpose(transpose((((arpeggio(echo(X,4,6) ) +transpose(X,4) ) +transpose(transpose((X+X) ,-5) ,7) ) |transpose(X,-7) ) ,4) ,7) ) ) ,-5) ) ,12) +transpose((transpose(arpeggio((step((transpose(echo((X+X) ,4,6) ,-7) +transpose(transpose((transpose((X+transpose((X+X) ,7) ) ,-7) +((X+X) +transpose((X|X) ,12) ) ) ,-5) ,4) ) ,12) +transpose(echo(((step((((X+X) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4) ) +transpose(echo((X+X) ,4,6) ,7) ) ,12) +transpose(arpeggio(transpose(X,-7) ) ,7) ) |arpeggio(shuffle((shuffle(step(X,12) ) +transpose((shuffle(X) +(X+transpose(shuffle(X) ,12) ) ) ,7) ) ) ) ) ,4,6) ,7) ) ) ,-5) +((((transpose(X,-7) +transpose((X+transpose(X,7) ) ,4) ) +transpose(arpeggio(transpose((X+transpose(X,7) ) ,-5) ) ,7) ) |(transpose(X,4) +transpose(((transpose((transpose(echo(X,4,6) ,-7) +transpose(transpose(X,-5) ,7) ) ,-5) +transpose((step(echo(X,4,6) ,12) +transpose((shuffle(X) |((X+transpose((X|X) ,4) ) +transpose(step(X,12) ,7) ) ) ,7) ) ,4) ) +transpose((transpose((X|X) ,-5) |((X+transpose(X,4) ) +transpose((X+X) ,7) ) ) ,7) ) ,12) ) ) +transpose(transpose(transpose((X|X) ,-5) ,-7) ,12) ) ) ,12) ) +transpose((transpose(transpose((transpose(echo(X,4,6) ,-5) +transpose(transpose(((transpose((X+X) ,4) +transpose(transpose((X+transpose(X,-5) ) ,-5) ,4) ) +transpose(transpose(((X+transpose(X,12) ) +echo(X,4,6) ) ,-7) ,7) ) ,4) ,12) ) ,-5) ,-5) +transpose(((transpose(transpose(transpose(transpose((transpose(X,-5) +transpose(((X+(X|X) ) +(X+transpose(X,12) ) ) ,12) ) ,-5) ,-7) ,4) ,4) +step(transpose(shuffle((((X|shuffle(X) ) +transpose((X+transpose(X,7) ) ,-7) ) +transpose((((X|arpeggio(X) ) +transpose(step((X|X) ,12) ,12) ) +echo(transpose(X,4) ,4,6) ) ,7) ) ) ,-7) ,12) ) |(((echo(step((X+transpose(transpose(X,-5) ,7) ) ,12) ,4,6) |(transpose(X,-5) +transpose(step(shuffle(X) ,12) ,12) ) ) |transpose(transpose(((X+transpose(step(X,12) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) ,-7) ) +transpose(shuffle(((transpose((step(X,12) |arpeggio(X) ) ,-5) +transpose(transpose(step(X,12) ,4) ,12) ) |arpeggio(transpose(transpose(transpose(X,-7) ,4) ,4) ) ) ) ,7) ) ) ,4) ) ,4) ) +transpose(transpose((transpose(transpose((transpose((arpeggio(transpose(transpose(X,-7) ,-5) ) +transpose((transpose((X+transpose(X,7) ) ,-7) |transpose(transpose(X,-7) ,-5) ) ,7) ) ,4) +(transpose(transpose(X,4) ,-7) +transpose(((((X+X) +((X+transpose(X,4) ) +transpose(X,7) ) ) +(shuffle(shuffle(X) ) +transpose((echo(X,4,6) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ) +transpose(((X+transpose(X,12) ) |transpose(X,-7) ) ,12) ) ,7) ) ) ,-5) ,-5) |(transpose(((transpose((transpose(transpose(transpose(transpose(X,-7) ,4) ,-5) ,4) +transpose(step(arpeggio((X|(X+transpose(X,12) ) ) ) ,12) ,7) ) ,-7) |echo(((((shuffle((transpose(X,-5) +X) ) +transpose((X+transpose(transpose(X,-5) ,12) ) ,4) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ,7) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(((X+transpose(X,12) ) |X) ,4) ,12) ) ,4,6) ) +(transpose(arpeggio(transpose(transpose((X+X) ,4) ,4) ) ,4) |transpose(step((transpose(X,-7) +transpose((X+(arpeggio(X) |transpose(X,-5) ) ) ,7) ) ,12) ,-7) ) ) ,-5) |transpose((shuffle((transpose(transpose(transpose(transpose(X,4) ,-5) ,-5) ,-5) +transpose(transpose(transpose((transpose(X,4) +(X+X) ) ,-5) ,-5) ,12) ) ) +(((echo(((X+X) +step(X,12) ) ,4,6) +transpose(transpose((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,-5) ,4) ) +transpose((X+X) ,7) ) |(shuffle(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) +(transpose(X,-5) +X) ) ) +(((((X+X) +transpose((X+X) ,4) ) +transpose(transpose(X,-5) ,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,7) ) ,7) ) ) ) ) ,-5) ) ) ,4) ,7) ) ) ,-7) ,12) )
random seed used was 13376428

The algorithm for Expresso is written in KeyKit, and here's the source code.