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 20 generations the expression "X" became this:

((((((step(transpose((echo(transpose((X+X) ,-5) ,4,6) +(transpose(transpose(X,-7) ,4) +transpose(transpose(transpose(transpose(X,-7) ,4) ,-7) ,7) ) ) ,-7) ,12) +step((transpose((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((step(step(X,12) ,12) |(X+X) ) ,12) ) ,-7) +((transpose(transpose((X+transpose(X,12) ) ,-5) ,-5) |step((step(((X+X) +echo(X,4,6) ) ,12) +transpose(transpose(X,-7) ,12) ) ,12) ) +((transpose(X,4) +transpose((((transpose(X,-5) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) ) ) ,12) ) +((transpose(echo((transpose((step(transpose((X+X) ,4) ,12) +echo(X,4,6) ) ,-7) +transpose(((arpeggio((X|X) ) +X) |transpose(((transpose(shuffle(X) ,-7) +transpose(((arpeggio(X) +transpose(step(X,12) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,4) ) ,4) ) ,4,6) ,-5) +transpose(transpose(transpose(transpose(arpeggio(step((arpeggio(arpeggio(X) ) +transpose(transpose((X|X) ,-5) ,7) ) ,12) ) ,-5) ,4) ,4) ,4) ) +transpose(step(transpose((transpose(((X+transpose(X,7) ) |X) ,4) +transpose(((echo(X,4,6) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(X+(X+transpose(X,7) ) ) ) ,4) ) +transpose(transpose((transpose(transpose(X,-5) ,-5) |((X+transpose(X,12) ) +shuffle(X) ) ) ,4) ,7) ) ,12) ) ,-7) ,12) ,7) ) ) +transpose(echo(((arpeggio(((((X+transpose(X,4) ) +transpose(shuffle(X) ,7) ) +transpose((((X+(X+X) ) |(arpeggio(X) +transpose(X,-7) ) ) +transpose(X,12) ) ,7) ) +transpose((transpose(transpose((X+X) ,4) ,-5) +transpose(echo(transpose(X,4) ,4,6) ,7) ) ,7) ) ) +transpose(transpose((((((X+transpose((X|X) ,4) ) +transpose(X,7) ) +transpose((((step(X,12) +transpose(X,4) ) +transpose((X+X) ,7) ) +(((X+X) +transpose(X,4) ) +transpose((X+X) ,7) ) ) ,4) ) +transpose(arpeggio((echo(X,4,6) +X) ) ,7) ) +transpose(transpose(transpose(X,-7) ,-7) ,-5) ) ,4) ,4) ) |((shuffle(transpose((transpose((((X+transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) +transpose(((X+transpose(arpeggio(X) ,7) ) +(step(X,12) |X) ) ,12) ) ,-5) ) +transpose((step(((((((X+X) +(X|X) ) +transpose((arpeggio((X+X) ) +shuffle((X|X) ) ) ,4) ) +transpose((transpose(echo(X,4,6) ,4) +transpose(transpose((X+transpose(X,12) ) ,4) ,12) ) ,7) ) |(shuffle(X) |X) ) +step(transpose(transpose(X,4) ,-7) ,12) ) ,12) +((((((((((shuffle(X) +transpose(X,12) ) +transpose(echo(transpose(transpose(X,-5) ,-5) ,4,6) ,4) ) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,7) ) +step(X,12) ) +transpose((X|(X+X) ) ,4) ) +transpose(X,7) ) +transpose(step(transpose(((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose((X|X) ,4) ) +transpose(step(transpose(X,-5) ,12) ,7) ) ,4) ,12) ,4) ) +transpose(((transpose((X+X) ,-5) +transpose((((X+transpose(X,12) ) |X) |echo(X,4,6) ) ,7) ) +transpose((arpeggio(((X|X) +transpose((X|X) ,7) ) ) +transpose(((X+X) +(X+transpose((X|X) ,12) ) ) ,12) ) ,12) ) ,7) ) +transpose(((step(step((X+X) ,12) ,12) +transpose(transpose(((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) ,4) ) +transpose((transpose((transpose((X|X) ,-5) +transpose((X+transpose(X,7) ) ,12) ) ,4) +transpose(((shuffle(transpose(X,4) ) +transpose(shuffle(((transpose(X,-5) +transpose(X,4) ) +transpose((X|X) ,7) ) ) ,4) ) +transpose((((X+transpose(X,7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X+X) ) ,4) ) +transpose(shuffle(X) ,7) ) ,7) ) ,12) ) ,7) ) ,4) ) +transpose(transpose(((X|X) +transpose(shuffle(X) ,7) ) ,4) ,7) ) ) ,4) ) +transpose(transpose(transpose((transpose(((transpose(X,4) +transpose(((X+transpose(X,12) ) |(X+transpose(X,12) ) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) +transpose(((transpose((X+transpose(X,7) ) ,-5) +transpose(transpose(transpose(X,4) ,-7) ,4) ) +transpose((X+X) ,7) ) ,12) ) ,-7) ,-7) ,7) ) ) ,4,6) ,12) ) |(transpose(((shuffle(echo((transpose((transpose(((X|X) +transpose(X,7) ) ,-5) +transpose(transpose(((X+transpose(X,12) ) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,4) ,7) ) ,-5) +transpose(transpose(echo((echo((X|X) ,4,6) +transpose(X,7) ) ,4,6) ,4) ,7) ) ,4,6) ) +transpose(arpeggio(transpose(transpose((step(step((arpeggio(X) |((X+X) |(X+X) ) ) ,12) ,12) +transpose(transpose(shuffle((X+X) ) ,-7) ,7) ) ,4) ,-5) ) ,4) ) +transpose(arpeggio(transpose(transpose(transpose(arpeggio(((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) |shuffle(X) ) +(X+transpose(X,7) ) ) ) ,4) ,4) ,-7) ) ,7) ) ,-5) |(((transpose((shuffle((X+shuffle(X) ) ) +(arpeggio(echo((step(X,12) |shuffle(X) ) ,4,6) ) +shuffle((shuffle(X) +X) ) ) ) ,-5) +transpose(((transpose((shuffle(arpeggio(((transpose(X,-7) +transpose(X,-5) ) |((X|X) +transpose((X|X) ,7) ) ) ) ) +(echo((X+transpose(X,12) ) ,4,6) +transpose((transpose(X,-7) +shuffle(shuffle((X+X) ) ) ) ,12) ) ) ,-5) +((((arpeggio((transpose(X,4) |transpose(X,-7) ) ) +echo((X|X) ,4,6) ) +transpose(transpose(X,4) ,-7) ) +transpose(transpose(transpose(X,4) ,-7) ,4) ) +transpose(transpose(((((X+X) |(X+transpose(X,7) ) ) +transpose(transpose((transpose(X,-7) |X) ,-7) ,12) ) +transpose((((transpose(X,4) |X) +transpose(X,4) ) +transpose((X|transpose(X,4) ) ,7) ) ,12) ) ,4) ,7) ) ) +transpose(((((X+transpose(transpose(X,4) ,12) ) +transpose(((transpose(((X+X) +transpose(X,4) ) ,4) +transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ) +transpose(arpeggio((X+X) ) ,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) +((X|(X|X) ) +(X|X) ) ) ,4) ) ,4) ) +transpose(echo(((transpose((transpose(X,4) +(X|transpose((X+transpose(X,7) ) ,4) ) ) ,-5) +transpose(transpose(transpose((X+transpose(X,7) ) ,-5) ,-7) ,4) ) +transpose(transpose(step(step(X,12) ,12) ,-7) ,7) ) ,4,6) ,7) ) +transpose(((step(transpose(((shuffle((transpose(X,4) |(X+transpose((X+transpose(X,7) ) ,4) ) ) ) +transpose(transpose((X+transpose(transpose(X,4) ,12) ) ,-7) ,4) ) +transpose(((((X|X) |X) +transpose((transpose(X,-5) +step((X+transpose(X,12) ) ,12) ) ,12) ) +transpose(arpeggio(((X+transpose(X,7) ) |X) ) ,-5) ) ,7) ) ,-7) ,12) +transpose((transpose(((transpose(transpose(X,-7) ,-5) |transpose(transpose((X|X) ,-5) ,4) ) +echo(transpose((transpose((X+transpose(X,12) ) ,-7) +transpose((X+transpose(X,7) ) ,12) ) ,-7) ,4,6) ) ,4) +((arpeggio(echo(X,4,6) ) +transpose(((((X+transpose(X,4) ) +transpose((X+transpose(transpose(X,-5) ,7) ) ,7) ) +transpose((transpose(step(transpose(X,-7) ,12) ,4) +transpose(transpose(transpose(transpose(X,4) ,4) ,-7) ,7) ) ,4) ) +transpose((transpose(transpose(X,-7) ,-5) +(X|X) ) ,7) ) ,4) ) +transpose(echo(step((X+transpose(X,7) ) ,12) ,4,6) ,7) ) ) ,4) ) +transpose(transpose(((transpose(X,-7) |((X+transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ) +transpose((((X+X) +transpose((X|X) ,12) ) +transpose(((shuffle(X) +X) +transpose(X,12) ) ,12) ) ,7) ) ,-5) ,7) ) ,12) ) ) ) +transpose(((((transpose(echo(((arpeggio(transpose((transpose(X,4) +X) ,4) ) +transpose(transpose((X|transpose(X,4) ) ,-7) ,4) ) +transpose((transpose(((X+transpose((X+X) ,4) ) +transpose(step(X,12) ,7) ) ,-7) |transpose(((X+transpose(X,7) ) +X) ,-7) ) ,7) ) ,4,6) ,-7) |(step(((transpose(arpeggio((((transpose(transpose(transpose(X,4) ,-5) ,-7) |(transpose(X,4) +echo(X,4,6) ) ) +transpose(((X+transpose(X,12) ) +X) ,7) ) |((shuffle(shuffle(echo(X,4,6) ) ) +transpose(step(shuffle(X) ,12) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) ) ) ,4) |(((shuffle(transpose((transpose(X,-7) +transpose((X+X) ,7) ) ,-7) ) |transpose(transpose(X,-5) ,-7) ) +(transpose((X+X) ,-7) |(transpose(X,-7) |(X+transpose(X,12) ) ) ) ) +transpose((transpose((transpose((X+transpose(X,12) ) ,-7) |(transpose(transpose((X+transpose(X,7) ) ,4) ,-5) |transpose(arpeggio(X) ,4) ) ) ,4) |echo(shuffle((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4,6) ) ,12) ) ) +transpose((shuffle(((transpose(X,4) |transpose((transpose(X,-5) |((transpose(X,-7) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ) ,4) ) +transpose((((shuffle(transpose(X,4) ) +transpose((transpose(((X|X) +X) ,4) |(X|X) ) ,4) ) +transpose(transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,4) ,7) ) +transpose(((X+X) +transpose((X+transpose(transpose(X,4) ,12) ) ,-5) ) ,-7) ) ,12) ) ) +(shuffle(shuffle(transpose(transpose((X+transpose((X|X) ,-5) ) ,4) ,-7) ) ) +transpose(transpose(((transpose((X+transpose(X,12) ) ,4) |transpose(transpose(((transpose(X,-5) +transpose((X|X) ,4) ) +transpose(X,7) ) ,4) ,-5) ) |transpose((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) +echo((shuffle(transpose(X,-7) ) +((X|X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4,6) ) ,4) ) ,-7) ,12) ) ) ,7) ) ,12) +transpose((arpeggio((((step((transpose(X,-7) |X) ,12) |arpeggio((transpose(echo(X,4,6) ,-7) +step(X,12) ) ) ) |echo(transpose(step(transpose((X|step(X,12) ) ,-5) ,12) ,-7) ,4,6) ) |((((transpose((arpeggio(X) +transpose((X+transpose(X,7) ) ,12) ) ,4) +transpose(transpose(shuffle(X) ,4) ,4) ) +transpose((X|(X|X) ) ,7) ) |transpose(transpose(arpeggio(step(X,12) ) ,-7) ,-5) ) +transpose((transpose(echo(transpose((echo(transpose(X,-7) ,4,6) +transpose(((X+transpose(X,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,4) ,4,6) ,-5) +((((X+X) |echo(X,4,6) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) |((X+(X+X) ) |(((X+transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,4) ,7) ) ) ) ) ,12) ) ) ) +(transpose(((arpeggio((transpose(((X+X) +transpose(X,12) ) ,-5) +shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) +transpose(((transpose(transpose(transpose(X,-5) ,-7) ,-5) +transpose(step(transpose(transpose(X,4) ,4) ,12) ,4) ) +transpose(transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ) ,-5) ,7) ) ,12) ) |transpose(echo(transpose((transpose(transpose((X|X) ,-7) ,4) +transpose(step(X,12) ,7) ) ,-5) ,4,6) ,-5) ) ,-5) +transpose(transpose(((transpose(transpose(((((X+transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) +transpose(transpose(((X+transpose(X,7) ) +X) ,4) ,4) ) +transpose(arpeggio((step(X,12) +transpose((X|X) ,12) ) ) ,7) ) +(transpose((shuffle(X) |(transpose(X,-7) +transpose(X,12) ) ) ,4) +transpose(transpose(((transpose(X,-5) +transpose(step(X,12) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-5) ,4) ) ) ,4) ,-7) +transpose(transpose((transpose((transpose(((X|X) |X) ,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) +transpose((X+transpose(transpose(transpose(X,4) ,-7) ,-7) ) ,7) ) ,-5) ,4) ) +transpose((transpose(step((echo(arpeggio(X) ,4,6) +transpose(transpose(X,4) ,7) ) ,12) ,-5) +(((((X+transpose(X,12) ) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) +transpose((transpose(X,-7) |((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(transpose(step(X,12) ,4) ,7) ) +X) ) ,7) ) ,4) ,7) ) ) ,12) ) ) +transpose(((arpeggio(transpose(((((X+X) +transpose(echo(step(X,12) ,4,6) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ) +(((((echo((transpose(arpeggio(X) ,-5) +echo(X,4,6) ) ,4,6) +transpose((shuffle(shuffle(transpose((X|X) ,4) ) ) +transpose(transpose(shuffle((transpose((X|X) ,-7) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-7) ,12) ) ,4) ) +transpose(echo(arpeggio(((X+X) |(X|X) ) ) ,4,6) ,7) ) +transpose((echo(((X+transpose(X,12) ) +(X+X) ) ,4,6) +transpose((X+((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,4) ) +transpose(X,7) ) ) ,12) ) ,12) ) +transpose(((echo(((transpose(X,-7) +((X|X) |X) ) |echo(transpose((X+X) ,4) ,4,6) ) ,4,6) +transpose(transpose(arpeggio((X+X) ) ,-5) ,4) ) +transpose(transpose(((((transpose(X,4) |transpose(X,4) ) +transpose((X+transpose(X,12) ) ,12) ) +((X|X) +((X+X) +transpose(X,12) ) ) ) |transpose(transpose((X+transpose(X,7) ) ,4) ,-5) ) ,4) ,7) ) ,12) ) +transpose(step(transpose((transpose((((arpeggio(X) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) |(transpose(arpeggio(X) ,-5) +X) ) ,-5) +transpose(transpose(transpose((((X+transpose(X,-5) ) +transpose(transpose(X,-5) ,4) ) +transpose((((X+X) +(X|X) ) +X) ,7) ) ,4) ,-5) ,7) ) ,-5) ,12) ,7) ) ) +transpose(step(transpose(((transpose(arpeggio(X) ,4) +transpose((X+transpose(X,-7) ) ,7) ) +transpose(shuffle(X) ,12) ) ,4) ,12) ,12) ) ,4) ) +transpose(transpose(((((echo((X+(X|X) ) ,4,6) |transpose(X,-7) ) +transpose(echo(transpose(transpose(transpose(transpose(X,4) ,-7) ,-5) ,4) ,4,6) ,4) ) +transpose(transpose(((transpose(X,-7) +shuffle(X) ) +(transpose(X,-5) |transpose(X,4) ) ) ,4) ,7) ) +transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +(X+X) ) ) ,7) ) ,4) ,7) ) +transpose(transpose((echo((((step(transpose(X,4) ,12) +(arpeggio(X) |transpose(X,-7) ) ) +transpose(transpose(transpose((X|(X+X) ) ,-5) ,4) ,7) ) +transpose(arpeggio(shuffle(echo(X,4,6) ) ) ,4) ) ,4,6) +transpose((arpeggio(((transpose(arpeggio(transpose(X,4) ) ,-5) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(arpeggio(transpose((transpose(X,-7) +transpose((X+transpose(X,7) ) ,12) ) ,-7) ) ,7) ) ) +echo(((((transpose(X,4) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X|X) ,7) ) +transpose(step(arpeggio(X) ,12) ,12) ) +shuffle((echo(arpeggio(X) ,4,6) +X) ) ) ,4,6) ) ,-7) ) ,-7) ,12) ) ,4) ) +transpose((transpose(((transpose((transpose((transpose(step((X+transpose(X,12) ) ,12) ,-5) +transpose(((X+transpose(X,12) ) |X) ,7) ) ,-7) +(((transpose(transpose(X,-7) ,4) +transpose(shuffle(X) ,-5) ) +transpose((transpose(X,4) +transpose((X+X) ,-7) ) ,4) ) +transpose(transpose(transpose(shuffle(arpeggio(X) ) ,-5) ,-7) ,7) ) ) ,-5) +transpose(transpose(((transpose(X,4) +transpose(transpose(X,-5) ,7) ) +shuffle(shuffle(X) ) ) ,4) ,-7) ) +((transpose(echo(transpose(transpose(step(transpose(X,4) ,12) ,4) ,-5) ,4,6) ,-5) +((transpose((X+transpose(X,7) ) ,-7) |(transpose((X+transpose(transpose(X,-5) ,12) ) ,4) +(shuffle((X+transpose(X,12) ) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) ) ) +(((((transpose(X,4) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+X) ,7) ) +transpose((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) +(shuffle(X) +transpose((X+transpose(X,12) ) ,7) ) ) |(transpose(step(step((X+transpose(X,7) ) ,12) ,12) ,-5) +transpose(arpeggio(shuffle(transpose(shuffle(X) ,-5) ) ) ,12) ) ) ) ) +transpose(transpose(echo(transpose((transpose((X|(X+X) ) ,-5) +((shuffle(X) +echo(X,4,6) ) +X) ) ,4) ,4,6) ,-5) ,12) ) ) ,-7) |((transpose(transpose((((arpeggio(transpose((transpose(X,4) +transpose(echo(shuffle(X) ,4,6) ,7) ) ,4) ) +transpose(((transpose(transpose(transpose(arpeggio(X) ,-5) ,-5) ,4) +transpose(transpose((X+step(echo(transpose(X,4) ,4,6) ,12) ) ,-7) ,-5) ) +transpose(echo(transpose(arpeggio(transpose((X+X) ,4) ) ,-7) ,4,6) ,12) ) ,4) ) +transpose(transpose(((((echo((transpose(X,4) +transpose((X|X) ,4) ) ,4,6) |(((X+transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ) |((arpeggio(((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ) +transpose((((step(X,12) +transpose(transpose(X,-5) ,4) ) +transpose((X|X) ,7) ) |X) ,4) ) +transpose(echo(X,4,6) ,7) ) ) +transpose(transpose((((shuffle((transpose(X,4) +(X+(X+X) ) ) ) +transpose(transpose(X,4) ,4) ) +transpose((((transpose(X,-7) +transpose(transpose(X,-7) ,12) ) |transpose(X,-7) ) |((X|X) +((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,4) ) +transpose(X,7) ) ) ) ,7) ) |((shuffle(X) |echo(X,4,6) ) +transpose(transpose(((X+X) |X) ,-5) ,7) ) ) ,-7) ,4) ) +transpose(((((transpose((X+transpose(transpose(X,4) ,7) ) ,4) |transpose(X,-7) ) +transpose(((X+(X|X) ) +transpose(transpose(X,4) ,12) ) ,4) ) +transpose((arpeggio(X) +transpose(shuffle(((transpose(X,-5) +transpose((X+X) ,4) ) +transpose((X|X) ,7) ) ) ,7) ) ,7) ) |((transpose(shuffle(echo(X,4,6) ) ,-5) +transpose(transpose((X|(X+transpose(X,7) ) ) ,-7) ,7) ) +(((transpose((X+transpose(X,7) ) ,-5) +transpose(transpose(X,-7) ,7) ) |((X+transpose(transpose(echo(X,4,6) ,-5) ,4) ) +transpose(X,7) ) ) |arpeggio((X|X) ) ) ) ) ,7) ) ,4) ,7) ) |transpose(((transpose(arpeggio(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +(X+X) ) ) ) ,-5) +transpose(((transpose((X+X) ,4) +transpose((echo(echo(X,4,6) ,4,6) +((transpose(X,-7) +transpose(transpose(X,-5) ,4) ) +transpose((X+X) ,7) ) ) ,12) ) +transpose(transpose((X+X) ,4) ,-5) ) ,12) ) +(((transpose(transpose(X,4) ,4) +transpose(echo(echo(transpose(arpeggio((X+transpose(X,12) ) ) ,-5) ,4,6) ,4,6) ,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(echo(step(transpose((X+X) ,-7) ,12) ,4,6) ,7) ) ) ,-7) ) ,4) ,-7) +transpose(shuffle(transpose(((((((((X|X) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(transpose(((X|X) |transpose(X,-5) ) ,4) ,4) ) +transpose(((X+(X+transpose(X,12) ) ) +transpose(X,-7) ) ,7) ) +transpose((transpose((transpose((X+transpose(X,12) ) ,-5) |(X|(X+X) ) ) ,4) +transpose((echo(step(X,12) ,4,6) +transpose(X,12) ) ,7) ) ,-7) ) +(transpose(X,-5) +transpose((arpeggio(arpeggio(X) ) +transpose(X,-5) ) ,7) ) ) +transpose(echo(transpose((X|transpose(transpose(X,4) ,4) ) ,-5) ,4,6) ,7) ) ,-5) ) ,4) ) +transpose(((echo(transpose((((transpose((transpose(transpose(((X+transpose(X,7) ) +transpose((X+X) ,12) ) ,-5) ,-5) |(arpeggio(((((X+transpose(X,12) ) +transpose(X,7) ) +step(transpose(X,4) ,12) ) |shuffle(X) ) ) +transpose(((((X|X) +transpose(X,7) ) +transpose((X|(X+X) ) ,4) ) +transpose(step(transpose(X,4) ,12) ,7) ) ,-5) ) ) ,-5) +transpose(arpeggio(echo(shuffle((transpose(echo((X|X) ,4,6) ,-7) +transpose(step((transpose(X,-5) |transpose((X+transpose(X,12) ) ,4) ) ,12) ,7) ) ) ,4,6) ) ,7) ) +transpose((transpose(((transpose(echo(((((((X+transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose((X|X) ,7) ) |((X+transpose(echo(X,4,6) ,4) ) +transpose((X+X) ,7) ) ) +transpose(X,4) ) +transpose((shuffle(X) +transpose(X,12) ) ,7) ) ,4,6) ,-7) +transpose((transpose(echo((X+transpose(X,7) ) ,4,6) ,4) +transpose(transpose(transpose(transpose(X,4) ,4) ,-7) ,7) ) ,4) ) +transpose(transpose(transpose(transpose((transpose(X,-5) +transpose(X,7) ) ,4) ,4) ,4) ,7) ) ,-5) +transpose((((transpose((((echo(step(X,12) ,4,6) +transpose(step(X,12) ,4) ) +transpose(step((X+X) ,12) ,7) ) +transpose(((transpose(X,4) +transpose(X,12) ) +(X+transpose(transpose(X,4) ,12) ) ) ,7) ) ,-7) +transpose(transpose(transpose(transpose(shuffle(X) ,-5) ,4) ,4) ,4) ) +transpose(shuffle(shuffle(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,7) ) |(((transpose((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose((X|X) ,7) ) ,-7) |(transpose(((step(X,12) +transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(((echo(X,4,6) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) ) +transpose(arpeggio((transpose(X,-5) +X) ) ,4) ) +transpose(transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) ,-7) ,7) ) ) ,12) ) ,7) ) +transpose(transpose((((shuffle(transpose(shuffle(arpeggio(X) ) ,-7) ) +transpose(arpeggio(((((X+transpose(transpose(X,4) ,12) ) +transpose((step(X,12) +transpose((X+X) ,7) ) ,12) ) +transpose(transpose(transpose(X,-5) ,-7) ,12) ) |transpose((X+transpose(X,4) ) ,4) ) ) ,4) ) +transpose(((transpose((arpeggio((X+X) ) +transpose(echo(step((X+transpose(X,12) ) ,12) ,4,6) ,12) ) ,4) +transpose(shuffle(transpose(X,4) ) ,4) ) +transpose((((X+X) +transpose(X,12) ) +transpose((X|(X|X) ) ,12) ) ,7) ) ,7) ) +((((((transpose(X,4) +transpose((step(echo(X,4,6) ,12) +transpose(transpose(X,-5) ,-7) ) ,4) ) +transpose((arpeggio(X) |X) ,7) ) +transpose((X|transpose(shuffle((X|X) ) ,4) ) ,4) ) +transpose((transpose(((shuffle(X) |X) |((X|X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-7) +transpose((X|(X|X) ) ,-7) ) ,7) ) +transpose(transpose(((((X|(X|X) ) +transpose(transpose(X,4) ,4) ) +transpose(X,4) ) +transpose((X+X) ,7) ) ,-5) ,4) ) +transpose((transpose(transpose(transpose(X,4) ,-7) ,-7) +transpose(transpose((((shuffle(X) |shuffle(transpose(X,-5) ) ) +transpose(transpose(arpeggio((X+X) ) ,4) ,4) ) +transpose((transpose(X,-5) |X) ,7) ) ,-7) ,7) ) ,7) ) ) ,4) ,12) ) ,-7) ,4,6) +transpose((shuffle(arpeggio((arpeggio(shuffle(transpose((X|X) ,4) ) ) |((arpeggio(shuffle((X|(X+transpose(X,7) ) ) ) ) +transpose((((transpose(echo(X,4,6) ,4) |(X+X) ) +transpose((transpose(arpeggio(X) ,4) +(((X+transpose(X,7) ) +transpose(X,7) ) +transpose((transpose(X,-5) +shuffle(X) ) ,7) ) ) ,4) ) +transpose((transpose(X,4) +(transpose(X,-7) +echo(X,4,6) ) ) ,7) ) ,4) ) +transpose((((shuffle(transpose(transpose((X|X) ,-5) ,4) ) +transpose((transpose(transpose(X,-7) ,-7) +transpose((X+transpose(X,12) ) ,4) ) ,4) ) +transpose((X|transpose(transpose(transpose(X,-5) ,-5) ,4) ) ,7) ) +transpose(transpose(transpose(X,-7) ,4) ,-5) ) ,7) ) ) ) ) +transpose(((((transpose(((step((X|shuffle(X) ) ,12) +transpose((echo(X,4,6) +step(X,12) ) ,12) ) |(transpose(transpose(X,-5) ,-5) +transpose(transpose((X|X) ,-5) ,12) ) ) ,-7) +transpose((((transpose(X,-5) +transpose(X,7) ) +transpose(X,7) ) +transpose(transpose((((X+transpose(X,12) ) +transpose((X|X) ,7) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,12) ) ,-5) ,12) ) ,4) ) |transpose(step(echo(arpeggio(transpose(transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +X) ) ,-5) ,4) ) ,4,6) ,12) ,-7) ) +transpose(transpose((((echo(transpose(X,-7) ,4,6) |arpeggio((X|X) ) ) +transpose((transpose((transpose(X,-5) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) +transpose(shuffle((transpose(X,4) +transpose((((X+X) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ) ,12) ) ,4) ) +transpose((transpose(transpose(arpeggio((X|X) ) ,-5) ,-5) +transpose((transpose(step(X,12) ,4) +((X+(X|(X|X) ) ) |transpose(transpose(echo(X,4,6) ,-5) ,4) ) ) ,12) ) ,7) ) ,4) ,4) ) +transpose(transpose(((shuffle((X+transpose(X,7) ) ) +arpeggio((((transpose((X+transpose(X,12) ) ,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(transpose(arpeggio(arpeggio(X) ) ,4) ,-7) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) ) ) +transpose((((((X+transpose(X,-5) ) +transpose(transpose(arpeggio(X) ,4) ,4) ) +transpose((((X+transpose((X+X) ,4) ) +transpose(X,7) ) +transpose(transpose(echo(X,4,6) ,-5) ,12) ) ,7) ) |(X+echo((transpose(transpose(X,-5) ,-7) +transpose(X,12) ) ,4,6) ) ) |(transpose(echo(transpose(X,-7) ,4,6) ,-5) |(transpose((echo((X+X) ,4,6) +(X+(X+transpose(X,12) ) ) ) ,4) +transpose(transpose((X+X) ,-5) ,7) ) ) ) ,7) ) ,-7) ,7) ) ,7) ) ,4) ) +transpose(transpose(transpose((((transpose((shuffle(shuffle((((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ) ) +transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ) ,-7) |transpose((X|X) ,4) ) |transpose((step((X|(arpeggio((X+transpose(X,7) ) ) +((X+X) |shuffle(X) ) ) ) ,12) +transpose(((transpose(X,4) +transpose((shuffle(X) +(X|X) ) ,4) ) +transpose((((X|X) +transpose((X|X) ,7) ) |transpose((transpose(X,-5) |X) ,-5) ) ,7) ) ,7) ) ,-7) ) +transpose(transpose(transpose(transpose((shuffle(transpose(X,4) ) +echo(step((X+transpose(X,7) ) ,12) ,4,6) ) ,-7) ,-7) ,-7) ,7) ) ,4) ,-7) ,7) ) ,7) ) ) ,7) )
random seed used was 23226866

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