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:

((transpose(step((((transpose(arpeggio(((((((echo(((X+transpose(X,12) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) +transpose(transpose(transpose(transpose(X,-5) ,4) ,4) ,4) ) +transpose((transpose(X,-7) +transpose(X,12) ) ,7) ) +transpose((echo(X,4,6) +transpose(step(shuffle(X) ,12) ,12) ) ,4) ) +transpose((((X+(arpeggio(X) |echo(X,4,6) ) ) +transpose(transpose((echo(X,4,6) +transpose(X,12) ) ,-7) ,4) ) +transpose(shuffle((transpose(X,-7) |X) ) ,7) ) ,7) ) |(((shuffle(X) +transpose(X,12) ) |arpeggio((X+(X+X) ) ) ) +transpose(((((transpose(X,-7) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +((X|shuffle(X) ) +(X+transpose(X,7) ) ) ) +transpose(arpeggio(((X+transpose(X,12) ) +X) ) ,12) ) ,7) ) ) +shuffle((echo(((step(X,12) |X) +(transpose(X,-5) |echo(X,4,6) ) ) ,4,6) +transpose((X|X) ,-7) ) ) ) ) ,-5) +transpose((((((transpose(X,-5) |(transpose(arpeggio(X) ,-5) +transpose(shuffle(X) ,12) ) ) +transpose(((shuffle(X) +transpose(((X|X) +transpose(transpose(transpose(X,4) ,-5) ,12) ) ,7) ) +transpose(((((echo(X,4,6) |step(X,12) ) +(X+transpose(transpose(X,-7) ,7) ) ) +(X+arpeggio(X) ) ) +transpose(shuffle(X) ,7) ) ,12) ) ,4) ) +transpose(transpose(step(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) ,12) ,4) ,7) ) +transpose(arpeggio(shuffle((shuffle(transpose((shuffle(X) |X) ,-5) ) |transpose(step(arpeggio((X+transpose(X,12) ) ) ,12) ,-7) ) ) ) ,7) ) +(transpose(transpose(transpose(transpose((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-5) ,4) ,-5) ,4) +transpose(transpose(((transpose(((transpose(transpose(X,-5) ,-7) +transpose(((X+X) +X) ,12) ) +transpose(step(X,12) ,12) ) ,-7) +transpose(echo(step(transpose(X,-7) ,12) ,4,6) ,4) ) +transpose((transpose((echo(X,4,6) |transpose((X+X) ,-7) ) ,4) +transpose((transpose(transpose(X,-5) ,4) |transpose((X+transpose(X,7) ) ,-5) ) ,12) ) ,7) ) ,-5) ,12) ) ) ,7) ) +echo(transpose(transpose(arpeggio(transpose(transpose(transpose(X,4) ,4) ,-7) ) ,-5) ,-5) ,4,6) ) +arpeggio((transpose((((arpeggio(transpose(((transpose(arpeggio(transpose(X,4) ) ,-5) +transpose(echo(echo(transpose(X,4) ,4,6) ,4,6) ,12) ) |transpose((((step((X+transpose((X|X) ,7) ) ,12) +transpose(transpose((shuffle(X) |X) ,4) ,7) ) +transpose(transpose((((X|X) |X) +transpose(X,-7) ) ,4) ,4) ) +transpose(((arpeggio(shuffle((X+X) ) ) +transpose(((shuffle(X) +transpose(((transpose(X,4) |X) |transpose(X,-7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,4) ) ,-5) ) +transpose((transpose(((shuffle(echo(X,4,6) ) +transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) +transpose((((((X+(X+transpose(X,7) ) ) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ) +transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(((step((X|X) ,12) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(step(X,12) ,7) ) ,-7) ) ,7) ) ,4) +transpose(shuffle(transpose(transpose((((arpeggio((X+transpose(X,7) ) ) +transpose(((X|X) +transpose(step(X,12) ,12) ) ,7) ) +((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ) |arpeggio(transpose(((X+X) +transpose(transpose(X,4) ,12) ) ,4) ) ) ,-7) ,4) ) ,7) ) ,4) ) +transpose((((echo((echo(echo(shuffle((X+X) ) ,4,6) ,4,6) +transpose(transpose(echo((X|X) ,4,6) ,4) ,7) ) ,4,6) +transpose(step(transpose(step(X,12) ,-5) ,12) ,12) ) +transpose(transpose(arpeggio((((arpeggio(X) +transpose(transpose((((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) |shuffle(X) ) ,4) ,7) ) +transpose(transpose(X,-7) ,-7) ) +transpose(transpose((transpose(transpose(transpose(X,-5) ,-5) ,4) +transpose(transpose((transpose(X,-7) |transpose(X,-5) ) ,-7) ,12) ) ,4) ,7) ) ) ,-7) ,4) ) +transpose(step(step(transpose((echo(((transpose(transpose(X,-7) ,4) +arpeggio((X+transpose(X,12) ) ) ) +transpose(transpose(X,4) ,12) ) ,4,6) +step(X,12) ) ,4) ,12) ,12) ,7) ) ,7) ) +(transpose((transpose(shuffle((transpose(arpeggio((((X|transpose(X,-5) ) +(X|arpeggio(X) ) ) +(step(transpose(X,-5) ,12) +transpose(X,-7) ) ) ) ,-5) +(transpose(transpose(transpose(step(X,12) ,-5) ,-7) ,4) |arpeggio(((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ) ) ) ,-7) +transpose((step(step((transpose(X,4) |(X+transpose(X,7) ) ) ,12) ,12) +transpose(transpose((((X+X) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,-7) ,12) ) ,-5) ) ,4) +(transpose(((((((transpose(X,4) |transpose(X,-5) ) +transpose(arpeggio(arpeggio(X) ) ,7) ) +(transpose(X,-5) +transpose((X+echo(X,4,6) ) ,7) ) ) |transpose(((((X+X) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(X,12) ) ,-7) ) +transpose(((X+X) +transpose(((X|X) +transpose(X,7) ) ,7) ) ,-7) ) +transpose(((arpeggio(transpose(transpose(X,-7) ,-7) ) |transpose(((((X+transpose(X,7) ) +transpose(X,12) ) +transpose((X|(X|X) ) ,4) ) +transpose((X+(X|X) ) ,7) ) ,-7) ) +transpose(transpose(arpeggio(((((transpose(X,-7) +transpose(step(X,12) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) +transpose(transpose(echo(X,4,6) ,4) ,4) ) +transpose(transpose(((X+X) +step(X,12) ) ,-5) ,7) ) ) ,4) ,12) ) ,-5) ) ,4) +(shuffle((transpose(((((X+transpose(X,7) ) +transpose((X|X) ,4) ) +transpose(X,7) ) +transpose(X,12) ) ,-7) +transpose(((((X+transpose(X,12) ) +transpose(X,12) ) +arpeggio((echo(X,4,6) +(X+X) ) ) ) |((step(shuffle(X) ,12) +transpose(transpose(X,-7) ,7) ) +(((X+transpose((X+X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(((X|X) +transpose(X,12) ) ,7) ) ) ) ,7) ) ) +(transpose(transpose(transpose(transpose(transpose(X,-5) ,-5) ,-5) ,4) ,4) |((shuffle(transpose(((X+transpose(X,12) ) |X) ,-5) ) +transpose(transpose(transpose((X|X) ,-7) ,4) ,-5) ) +transpose((step(transpose(X,-5) ,12) +transpose(echo(((transpose((X+transpose(X,12) ) ,-7) +transpose((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(X,7) ) ,4) ) +transpose(shuffle((X|X) ) ,7) ) ,4,6) ,7) ) ,7) ) ) ) ) ) ) ,4) |transpose(((arpeggio(step((transpose(echo(transpose(transpose(X,4) ,-7) ,4,6) ,-7) +transpose(((X+transpose(X,7) ) +(X+transpose(X,12) ) ) ,7) ) ,12) ) +transpose(transpose(arpeggio((step(transpose(X,-7) ,12) +transpose(arpeggio(echo(((X+transpose(X,12) ) |X) ,4,6) ) ,7) ) ) ,4) ,4) ) +transpose(((echo((echo(arpeggio(transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ) ,4,6) +transpose(transpose(arpeggio((X+transpose(X,12) ) ) ,4) ,12) ) ,4,6) |transpose(transpose(arpeggio(transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ) ,-7) ,4) ) +transpose(transpose(transpose(echo((X+transpose(X,12) ) ,4,6) ,-5) ,-5) ,12) ) ,7) ) ,-5) ) ) ) ,12) ,-5) +transpose(echo(transpose((transpose(((((((X|(X+transpose(X,7) ) ) +transpose((transpose((arpeggio((X|X) ) +(((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,4) |((step((X+transpose(X,7) ) ,12) +transpose(transpose((X+X) ,-7) ,12) ) |((X|X) |transpose(X,-7) ) ) ) ,7) ) +transpose(transpose(shuffle((((X+transpose(step(X,12) ,4) ) +transpose(X,7) ) |(X+X) ) ) ,-5) ,4) ) +transpose(echo(((step(((X+transpose(X,7) ) +transpose(arpeggio(X) ,7) ) ,12) +transpose(arpeggio(shuffle(X) ) ,7) ) |transpose(step(step(arpeggio(X) ,12) ,12) ,4) ) ,4,6) ,7) ) +transpose((transpose(transpose(((echo(X,4,6) |echo((X+transpose(X,7) ) ,4,6) ) |transpose((transpose(X,-5) +transpose(transpose((X+transpose(X,7) ) ,4) ,12) ) ,-5) ) ,4) ,-5) |((echo(transpose(transpose(X,-7) ,4) ,4,6) +step(transpose(transpose(((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ,-7) ,12) ) +transpose(transpose(((transpose(X,-7) |transpose(X,-5) ) +transpose(shuffle((transpose(X,-7) +echo((X+transpose(X,7) ) ,4,6) ) ) ,12) ) ,4) ,7) ) ) ,12) ) |((((X+X) |transpose(X,4) ) +(transpose(echo(X,4,6) ,-7) +transpose(transpose(X,-5) ,12) ) ) +shuffle(transpose(X,4) ) ) ) ,4) +transpose(((echo(transpose(step(echo(((X+X) +transpose(X,7) ) ,4,6) ,12) ,-5) ,4,6) |((((((X+X) +transpose(transpose(X,4) ,4) ) +transpose((transpose(X,4) |X) ,7) ) +transpose(((transpose(X,4) |(X+transpose(X,12) ) ) +transpose((transpose(X,-5) +transpose(transpose(X,4) ,7) ) ,12) ) ,12) ) +transpose(transpose((transpose(X,4) |X) ,-7) ,4) ) +transpose(((shuffle(X) +shuffle(X) ) +X) ,7) ) ) +echo((((arpeggio(echo(X,4,6) ) |arpeggio((X+transpose((X|X) ,7) ) ) ) +transpose(((((transpose(transpose(X,4) ,4) +transpose(step(shuffle(X) ,12) ,12) ) +((((transpose((X+transpose(X,7) ) ,-5) +transpose(transpose(transpose(X,4) ,-7) ,4) ) +transpose((X|(X+transpose(X,7) ) ) ,7) ) +transpose((X+X) ,4) ) +transpose(echo(((X+transpose((X|X) ,4) ) +transpose((X+X) ,7) ) ,4,6) ,7) ) ) +transpose((shuffle(transpose(((X+transpose(X,12) ) +(X+X) ) ,4) ) |transpose(transpose((X+transpose(X,12) ) ,-7) ,-7) ) ,12) ) |transpose((shuffle((X+transpose(arpeggio(X) ,12) ) ) +transpose(((transpose(X,-7) +transpose(transpose(transpose(X,-7) ,-5) ,4) ) +transpose(transpose((X|X) ,-7) ,7) ) ,12) ) ,-5) ) ,4) ) +transpose((transpose((X+transpose(X,-5) ) ,4) +transpose(((step(X,12) |transpose(X,-5) ) |arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ) ,12) ) ,7) ) ,4,6) ) ,-7) ) ,4) ,4,6) ,4) ) +transpose(shuffle((transpose((((transpose((((transpose(((step((X+X) ,12) +transpose(transpose(X,-7) ,7) ) +transpose((arpeggio(transpose((X+transpose(X,7) ) ,-7) ) +((X+transpose(X,7) ) +transpose(X,7) ) ) ,7) ) ,4) +transpose((transpose(transpose(transpose(X,4) ,-5) ,-7) |(transpose(((((((X+X) |X) +transpose(transpose(X,-5) ,4) ) +transpose(echo((X+X) ,4,6) ,7) ) +transpose(transpose((X+X) ,4) ,4) ) +transpose(echo((arpeggio(X) +X) ,4,6) ,7) ) ,-5) +transpose((step(((echo((X|X) ,4,6) +transpose((X+transpose(transpose(X,-7) ,12) ) ,4) ) +transpose((transpose(X,-5) +transpose((X+transpose(X,12) ) ,12) ) ,7) ) ,12) |transpose(transpose(transpose(shuffle(X) ,-7) ,-7) ,4) ) ,7) ) ) ,4) ) +transpose(echo((transpose(((X+transpose((X+transpose(X,12) ) ,12) ) +transpose(((X+transpose(X,12) ) +transpose(shuffle(X) ,7) ) ,12) ) ,-5) +(step(arpeggio(X) ,12) |((((X+transpose(X,4) ) +transpose(X,7) ) |step(X,12) ) +transpose((transpose(X,4) +transpose(X,-7) ) ,12) ) ) ) ,4,6) ,7) ) |transpose((((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X|echo(X,4,6) ) +transpose(((X+transpose(X,12) ) |(X+transpose(X,12) ) ) ,7) ) ,4) ) +transpose(X,7) ) |(transpose(X,-5) +transpose(transpose(X,4) ,7) ) ) +transpose(transpose(arpeggio(echo(X,4,6) ) ,-7) ,4) ) +transpose(shuffle(((X+transpose(arpeggio(X) ,12) ) |X) ) ,7) ) ,-5) ) ,-5) |transpose(transpose((transpose((((X+X) +transpose(transpose(X,4) ,12) ) +transpose(transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,4) ,12) ) ,4) |(transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,4) +transpose((step(((X+transpose(arpeggio(X) ,7) ) +transpose((transpose(X,-5) |step(X,12) ) ,12) ) ,12) |transpose(transpose(X,4) ,4) ) ,7) ) ) ,-5) ,4) ) |(echo(((((transpose((((X+transpose(X,12) ) |(X+X) ) +transpose(arpeggio(transpose(X,4) ) ,7) ) ,4) +transpose((arpeggio((step((X+X) ,12) +transpose((transpose(step(X,12) ,4) +transpose(arpeggio(X) ,-5) ) ,7) ) ) +transpose((arpeggio(X) +((((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(arpeggio(X) ,-7) ,7) ) ) ,12) ) ,7) ) +(((arpeggio(step(echo((X|X) ,4,6) ,12) ) +X) |arpeggio(((X+transpose(X,4) ) +transpose(shuffle(X) ,7) ) ) ) +transpose(transpose((arpeggio(transpose(X,4) ) +transpose(transpose(shuffle((transpose(shuffle(X) ,4) +transpose((transpose(X,4) |X) ,12) ) ) ,4) ,12) ) ,-5) ,7) ) ) +transpose(((((transpose(transpose(arpeggio((X+X) ) ,-7) ,4) +transpose((transpose(arpeggio(transpose(X,-5) ) ,-7) |transpose(transpose(transpose(X,-7) ,4) ,-5) ) ,4) ) +transpose((X+transpose(((X|X) +(X+transpose(X,7) ) ) ,12) ) ,7) ) |transpose(((echo(echo(transpose(X,-5) ,4,6) ,4,6) +echo(X,4,6) ) +transpose((transpose(X,-5) |(X|transpose(transpose(X,4) ,4) ) ) ,12) ) ,4) ) +transpose((step(transpose(step(shuffle(X) ,12) ,4) ,12) +arpeggio((echo((X|X) ,4,6) +transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,-5) ,12) ) ) ) ,12) ) ,4) ) +transpose(transpose(transpose(((((X+transpose(X,7) ) |arpeggio(transpose((X+transpose(X,7) ) ,-5) ) ) +((X|transpose(X,4) ) +transpose(transpose((((X|X) +transpose((X|X) ,4) ) +transpose(X,7) ) ,-5) ,7) ) ) +transpose(arpeggio(arpeggio(transpose(((X|X) |((step(X,12) +transpose(X,4) ) +transpose(X,7) ) ) ,-5) ) ) ,7) ) ,4) ,-7) ,7) ) ,4,6) |echo(((step((((((X+(X+transpose(X,12) ) ) +transpose(transpose(X,-5) ,7) ) +transpose(((X+X) |(X|X) ) ,-5) ) +transpose(transpose((X+X) ,4) ,-7) ) |(((echo(X,4,6) +((X|X) |X) ) |transpose(step(transpose(X,4) ,12) ,-5) ) +(((X+transpose(transpose(transpose(X,4) ,-7) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(X,-7) ) ) ) ,12) |(arpeggio(transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ) +transpose(transpose(transpose(((shuffle((X+transpose(X,7) ) ) +transpose(X,4) ) +transpose(((X+transpose(X,12) ) +transpose(transpose(X,-7) ,12) ) ,7) ) ,4) ,-7) ,12) ) ) +transpose((transpose((((((transpose(((X+transpose(X,12) ) +X) ,-7) +transpose(arpeggio(X) ,-5) ) +transpose(((X+transpose(shuffle(X) ,4) ) +transpose(step(X,12) ,7) ) ,12) ) +transpose(transpose(shuffle((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(transpose((X+X) ,4) ,7) ) ) ,-5) ,12) ) +transpose((arpeggio(transpose((step(X,12) +(X+transpose(X,12) ) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(transpose((X+X) ,-5) ,7) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(shuffle(X) ,7) ) |echo((X+transpose(X,7) ) ,4,6) ) ,-5) ,7) ) ,7) ) ,4) ) +transpose(step((echo(((echo((X+transpose(X,12) ) ,4,6) +transpose(transpose(((X|X) +transpose(X,-5) ) ,-5) ,4) ) +transpose(arpeggio(X) ,7) ) ,4,6) +transpose(transpose(transpose((transpose((X+transpose(X,12) ) ,4) |transpose(X,-7) ) ,4) ,-5) ,7) ) ,12) ,7) ) ,4) +(((((X+X) +step(X,12) ) +transpose((shuffle(transpose(X,-5) ) +transpose(((X+transpose(X,12) ) |(X+transpose(X,7) ) ) ,7) ) ,4) ) +transpose(step(transpose((X+X) ,-5) ,12) ,7) ) +transpose(transpose(shuffle(shuffle((X+transpose(X,12) ) ) ) ,-7) ,7) ) ) ,7) ) ,4,6) ) ) |transpose((transpose((((((((transpose(X,-5) +transpose((transpose(X,-5) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) +transpose((transpose(X,-7) |(transpose(X,-5) +X) ) ,12) ) +transpose(echo((transpose(X,-5) +transpose((transpose(X,4) |transpose(X,4) ) ,7) ) ,4,6) ,7) ) |((transpose((X+X) ,-5) |shuffle(((X+transpose(X,7) ) |echo(X,4,6) ) ) ) +echo((X+transpose(X,12) ) ,4,6) ) ) +transpose(step(arpeggio(step((X+transpose(echo(X,4,6) ,7) ) ,12) ) ,12) ,12) ) +transpose(transpose(transpose((arpeggio(X) |X) ,-5) ,-5) ,12) ) +transpose(((transpose(((transpose((transpose(X,-7) |(X+transpose(X,4) ) ) ,-5) +transpose(transpose(transpose(transpose(X,4) ,-5) ,-5) ,-5) ) +((transpose(X,4) +(transpose(X,-7) |((X+transpose(X,12) ) +transpose((X|X) ,12) ) ) ) |(((((X|X) +(X+transpose(X,7) ) ) |(transpose(X,-5) |step(X,12) ) ) |transpose(step(X,12) ,-5) ) +transpose((((transpose(X,-7) +transpose(transpose((X+X) ,4) ,4) ) +transpose((X|(X+transpose(X,12) ) ) ,7) ) +X) ,7) ) ) ) ,4) +transpose(arpeggio(transpose((step(echo(transpose(X,4) ,4,6) ,12) |((((X+transpose(X,12) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose(echo((X+transpose(X,-5) ) ,4,6) ,12) ) ) ,-7) ) ,4) ) +transpose(transpose((transpose(arpeggio(X) ,-5) |arpeggio(transpose(transpose((transpose(X,4) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,4) ) ) ,4) ,7) ) ,7) ) ,4) +((((shuffle((transpose((transpose(X,-5) |(X+X) ) ,4) +arpeggio(((echo((X+transpose(X,7) ) ,4,6) +transpose(step((X+transpose(transpose(X,-5) ,7) ) ,12) ,12) ) |(transpose(X,-7) +transpose(arpeggio(X) ,12) ) ) ) ) ) +transpose(transpose((step((((transpose((X+transpose(X,12) ) ,-7) +transpose(X,12) ) +shuffle((X+X) ) ) +transpose((transpose(X,-5) |(X+transpose(X,7) ) ) ,7) ) ,12) +transpose(echo(transpose(X,-5) ,4,6) ,12) ) ,-5) ,4) ) +transpose((transpose(arpeggio(X) ,4) +transpose(arpeggio(((transpose(X,-7) |(transpose(X,-7) +transpose((X+X) ,7) ) ) +transpose(transpose(((X+shuffle(X) ) |shuffle(X) ) ,-7) ,12) ) ) ,12) ) ,7) ) |step((transpose((transpose(echo(transpose(X,4) ,4,6) ,-7) |(transpose((((X+X) |(X+X) ) +(X+transpose(X,7) ) ) ,-5) |(transpose(X,4) +transpose(echo((X|X) ,4,6) ,7) ) ) ) ,-7) |(((shuffle(transpose(step(transpose(step(X,12) ,4) ,12) ,-5) ) |(echo(((X+transpose(transpose(X,-5) ,7) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,12) ) ,4,6) +transpose(transpose(echo(transpose(X,-5) ,4,6) ,4) ,12) ) ) +transpose((X+X) ,4) ) +transpose((echo((X+transpose(shuffle(X) ,12) ) ,4,6) +arpeggio((step(X,12) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-7) ) ) ) ,7) ) ) ,12) ) +transpose((transpose((((transpose((X+shuffle((X+transpose(X,7) ) ) ) ,-7) +transpose(step(((step(transpose(X,-7) ,12) +transpose(transpose(transpose(X,-5) ,-5) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) ,12) ,12) ) +arpeggio(transpose(transpose(((step(X,12) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,-5) ,4) ) ) +transpose((((((transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-5) ,4) ) +transpose((transpose((X|(X+X) ) ,-7) +((transpose(shuffle(X) ,-5) +transpose(((X|X) +X) ,4) ) +transpose((X+transpose(X,4) ) ,7) ) ) ,7) ) +transpose(transpose((transpose(X,-7) +transpose((X+transpose(X,7) ) ,-5) ) ,-7) ,4) ) +transpose(transpose(arpeggio((X+transpose((X|echo(X,4,6) ) ,12) ) ) ,4) ,7) ) |(transpose((transpose((X|X) ,-7) +transpose(shuffle(((X+transpose(X,12) ) |X) ) ,12) ) ,4) +transpose(transpose((transpose(step(transpose(X,4) ,12) ,-5) +transpose((shuffle(X) |step(X,12) ) ,12) ) ,-5) ,7) ) ) ,7) ) ,-7) |((arpeggio(X) +transpose((((transpose((X|transpose(X,-5) ) ,-7) +transpose((X+transpose(X,-7) ) ,4) ) +transpose(((X+X) +(X+transpose(X,12) ) ) ,7) ) |(X|X) ) ,7) ) +transpose(transpose((transpose(X,-5) +transpose(X,12) ) ,4) ,-5) ) ) ,12) ) ) ,-5) ) ,4) |(((arpeggio((echo((arpeggio(((shuffle((X|X) ) +transpose((step(X,12) +transpose(transpose(X,4) ,12) ) ,4) ) +transpose(step(step(X,12) ,12) ,7) ) ) +transpose(((X+transpose(X,12) ) +transpose(transpose(X,-7) ,12) ) ,-5) ) ,4,6) +transpose((transpose(transpose((X+transpose(X,12) ) ,-7) ,-5) +((X+X) +transpose(transpose(X,4) ,12) ) ) ,12) ) ) +((transpose(((transpose(step(echo(X,4,6) ,12) ,4) +transpose((X+step(X,12) ) ,4) ) +transpose(arpeggio(transpose(transpose((X+transpose(transpose(X,4) ,7) ) ,-5) ,-5) ) ,7) ) ,4) +transpose((transpose((X+transpose(X,12) ) ,-7) +transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +X) +transpose(transpose(X,-5) ,-7) ) ,12) ) ,4) ) +(transpose(transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,-7) ,4) +transpose(transpose(transpose(X,-7) ,-7) ,-5) ) ) ) |transpose(step(step(shuffle(((((shuffle(((X+transpose(X,7) ) +transpose(transpose(X,4) ,7) ) ) +transpose(transpose((X+transpose(step(X,12) ,7) ) ,4) ,4) ) +transpose(transpose((arpeggio(X) +transpose((X+transpose(X,12) ) ,12) ) ,-7) ,7) ) +transpose(transpose((transpose(transpose(transpose(X,-7) ,4) ,-5) |(((X+X) +transpose(echo(X,4,6) ,4) ) +transpose(transpose((X+X) ,4) ,7) ) ) ,-5) ,4) ) +transpose(transpose((shuffle(X) |X) ,-5) ,7) ) ) ,12) ,12) ,-7) ) |(transpose(shuffle((echo(arpeggio(transpose(transpose(((((X|X) +transpose(X,4) ) +transpose((X|X) ,7) ) |((step(X,12) |X) +X) ) ,4) ,-7) ) ,4,6) +transpose(transpose(transpose(((transpose(echo(transpose(transpose(X,-7) ,-5) ,4,6) ,-5) +transpose((transpose((X+(X+transpose(X,7) ) ) ,-7) +((step((X+transpose(X,7) ) ,12) +transpose(transpose(transpose(X,-5) ,4) ,4) ) +transpose(((X+transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,7) ) ) ,4) ) +transpose(transpose(step(X,12) ,-5) ,7) ) ,-7) ,-5) ,-5) ) ) ,-7) +((((arpeggio((shuffle(transpose(X,4) ) +transpose((X+transpose(X,12) ) ,12) ) ) |shuffle(X) ) +transpose((arpeggio(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose((transpose((transpose(step((X+transpose(X,7) ) ,12) ,4) +transpose((X+transpose(transpose(X,-7) ,7) ) ,7) ) ,-5) |((echo((arpeggio(step(X,12) ) |(transpose(X,4) +X) ) ,4,6) +transpose((transpose(X,-7) +(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,4) ) +transpose((step((X+transpose(X,12) ) ,12) |((transpose(X,-5) +transpose(arpeggio(X) ,12) ) |arpeggio(X) ) ) ,7) ) ) ,12) ) ,4) ) +transpose(step(shuffle(transpose(X,-5) ) ,12) ,7) ) +transpose(((echo(transpose(shuffle((X+transpose(X,7) ) ) ,-5) ,4,6) +(transpose(((step(X,12) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,-7) +transpose((echo(transpose((X+X) ,4) ,4,6) |shuffle(transpose(X,-7) ) ) ,12) ) ) |(transpose((((transpose(X,4) +transpose((X|X) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(transpose(X,-7) ,7) ) ,-5) +transpose(transpose(shuffle((arpeggio(X) |((transpose(X,4) +transpose((X|X) ,12) ) +(X+transpose((X+X) ,7) ) ) ) ) ,-5) ,12) ) ) ,7) ) ) ) ) ) ,7) )
random seed used was 179610060

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