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:

((((arpeggio(echo(((((step((((step(transpose((((X|transpose(X,4) ) +transpose(echo(X,4,6) ,4) ) +((X+transpose(X,12) ) +transpose((X+transpose((X+X) ,7) ) ,12) ) ) ,4) ,12) |((transpose(((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-7) +transpose((((X|transpose(X,4) ) +transpose(transpose((step(X,12) +transpose(transpose(X,-5) ,7) ) ,4) ,12) ) |echo((X+X) ,4,6) ) ,4) ) +transpose(shuffle(transpose(transpose(X,4) ,-5) ) ,7) ) ) +transpose(((echo(echo(X,4,6) ,4,6) |transpose(((transpose(transpose(X,-5) ,4) +transpose(arpeggio(X) ,12) ) +step(transpose(echo(X,4,6) ,-5) ,12) ) ,-5) ) |transpose(shuffle(shuffle(transpose(arpeggio(echo(X,4,6) ) ,4) ) ) ,4) ) ,4) ) +transpose(arpeggio(((transpose((((X+transpose(X,12) ) |shuffle(X) ) +(transpose((X+X) ,-5) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,12) ) ) ,-7) |((transpose(transpose(shuffle((X+X) ) ,-5) ,4) +transpose(echo(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,-7) ,4,6) ,4) ) +transpose(step(transpose(echo(X,4,6) ,-5) ,12) ,7) ) ) +(step(((((X|X) +transpose((X+X) ,4) ) +transpose(X,7) ) +shuffle(shuffle((step(X,12) +(X+X) ) ) ) ) ,12) +echo((transpose(shuffle(X) ,-7) +transpose(((echo(X,4,6) |echo(X,4,6) ) +((X+transpose(X,7) ) +X) ) ,7) ) ,4,6) ) ) ) ,7) ) ,12) +transpose(shuffle(transpose((((arpeggio((X+transpose(X,7) ) ) +transpose(X,7) ) +transpose((X|(X+X) ) ,12) ) +((step((X+transpose(X,12) ) ,12) +transpose((step(X,12) +(X+transpose(X,7) ) ) ,12) ) +transpose(((transpose(X,-7) +transpose((X|X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ) ,4) ) ,4) ) +transpose(transpose((transpose((transpose(X,-5) +(transpose(X,-7) +transpose(X,7) ) ) ,-7) +((((X+transpose(X,-7) ) +transpose(transpose(X,-5) ,7) ) |transpose(arpeggio(X) ,-7) ) |((X|X) |(transpose(X,-5) |X) ) ) ) ,-7) ,7) ) +transpose((((transpose((shuffle(arpeggio(X) ) +transpose(step((transpose(transpose(X,4) ,-7) |transpose(X,4) ) ,12) ,-7) ) ,4) |((transpose(((((shuffle(arpeggio(X) ) +((X+transpose(((echo(X,4,6) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ) |transpose(transpose(arpeggio(transpose(X,-7) ) ,4) ,-5) ) +transpose(shuffle((arpeggio(((X+transpose(X,12) ) +transpose(X,12) ) ) +transpose(transpose((X+transpose(X,-5) ) ,4) ,12) ) ) ,4) ) +transpose(step((transpose(((X+X) +transpose(X,12) ) ,-7) |transpose(step(shuffle(X) ,12) ,-5) ) ,12) ,7) ) ,-5) |transpose(transpose(step(transpose(X,-7) ,12) ,-7) ,4) ) |(echo(((X|X) +(X+step(X,12) ) ) ,4,6) |arpeggio(X) ) ) ) +transpose((arpeggio(shuffle(transpose((step(X,12) +transpose(transpose(transpose((transpose(transpose(X,4) ,-7) |((X+X) +transpose(transpose(X,4) ,7) ) ) ,4) ,-7) ,7) ) ,4) ) ) +((transpose(((X+transpose(transpose(arpeggio(transpose(X,4) ) ,-7) ,12) ) +transpose((X|(echo(X,4,6) +transpose(shuffle(transpose(X,-5) ) ,7) ) ) ,7) ) ,-7) +(transpose(X,4) +transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-7) ) +(((X+X) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ) ,4) ,12) ) ) +((((((X+transpose(X,12) ) +transpose(X,12) ) |transpose((X+transpose(X,7) ) ,-7) ) |(echo(transpose((X+X) ,-7) ,4,6) +transpose(transpose((step(X,12) +transpose((X+transpose(transpose(X,4) ,7) ) ,12) ) ,-7) ,7) ) ) +transpose(((shuffle(transpose(X,4) ) +transpose(X,12) ) +transpose(transpose(X,-5) ,-7) ) ,4) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) ) ) ,4) ) +transpose(((transpose(shuffle(step(transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ,12) ) ,4) +((transpose(X,4) |(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose((X|X) ,7) ) +transpose(transpose(X,-7) ,-5) ) ) +transpose(echo(transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4) ,4,6) ,12) ) ) |transpose(arpeggio((step((transpose((X+transpose((X|X) ,7) ) ,4) +transpose(transpose(X,-7) ,7) ) ,12) +shuffle(transpose(((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-5) +transpose((X|transpose(X,-7) ) ,4) ) +transpose(((shuffle(X) +transpose((transpose(X,4) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,-5) ) ) ) ,-7) ) ,7) ) ,4) ) +transpose(((shuffle((step((((transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) +transpose(arpeggio(step(X,12) ) ,4) ) +transpose(transpose(((X+transpose(transpose(X,4) ,7) ) |echo(X,4,6) ) ,-7) ,7) ) |(step(transpose((X|transpose(X,4) ) ,-5) ,12) +echo(arpeggio(X) ,4,6) ) ) ,12) +transpose(((transpose(transpose(transpose(X,4) ,4) ,-5) +((transpose(X,4) +transpose(step((X+transpose(X,7) ) ,12) ,12) ) +transpose((X+X) ,-7) ) ) +((((shuffle((X+X) ) +transpose(transpose(step(X,12) ,4) ,7) ) |transpose((X|X) ,-5) ) +transpose((shuffle(X) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |step(X,12) ) |transpose(X,-7) ) ,7) ) ,4) ) +transpose(transpose(((X|X) +transpose(shuffle(X) ,12) ) ,4) ,7) ) ) ,12) ) ) +transpose((transpose((transpose(X,-7) +transpose((transpose((X+X) ,-5) +transpose(transpose(X,4) ,12) ) ,12) ) ,4) +transpose(echo((transpose(transpose((transpose(X,4) +(X+transpose(shuffle(X) ,12) ) ) ,-7) ,4) +(step(arpeggio((X+transpose(X,7) ) ) ,12) +transpose(arpeggio((transpose(X,-7) +transpose(X,7) ) ) ,12) ) ) ,4,6) ,7) ) ,-7) ) |transpose(((transpose((step((arpeggio(X) |transpose(X,-5) ) ,12) +transpose(transpose(transpose(X,-5) ,-5) ,-7) ) ,-7) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +transpose(((step((X+X) ,12) +arpeggio(step(transpose(X,4) ,12) ) ) +transpose(echo(transpose(transpose(X,-5) ,4) ,4,6) ,7) ) ,4) ) ,-7) ) ,7) ) ,4,6) ) +transpose(step(transpose(transpose((transpose(((step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) ,12) |(transpose(X,-7) +transpose(echo(X,4,6) ,7) ) ) +transpose((step(transpose(transpose((X+X) ,4) ,4) ,12) +transpose((shuffle((X+(X+X) ) ) |transpose(step(X,12) ,-7) ) ,12) ) ,12) ) ,-7) +transpose(transpose(arpeggio(arpeggio(((((X+transpose(X,4) ) +transpose(X,7) ) +step(X,12) ) +shuffle((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) ) ) ,-7) ,4) ) ,-7) ,-7) ,12) ,4) ) +transpose(arpeggio(transpose(((transpose(((((transpose(transpose((((X+X) |transpose(X,4) ) +transpose(X,-5) ) ,4) ,4) +transpose(step(echo(transpose((X+transpose(X,7) ) ,-5) ,4,6) ,12) ,4) ) +transpose((echo((step(X,12) +X) ,4,6) +step((transpose(X,4) +transpose(X,7) ) ,12) ) ,7) ) +transpose(transpose(transpose((transpose(((transpose(echo(X,4,6) ,-5) +transpose((((X+transpose(X,7) ) |echo(X,4,6) ) +transpose(X,-5) ) ,7) ) +transpose(echo(transpose(((((transpose(X,4) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) +transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) ,4,6) ,12) ) ,-5) +transpose(transpose(((X+X) +transpose(X,4) ) ,4) ,4) ) ,-7) ,-5) ,4) ) +transpose(echo((((shuffle((transpose((transpose(X,4) +transpose(X,-7) ) ,-5) +((X+X) |transpose(X,-7) ) ) ) +transpose((transpose(transpose(transpose(X,-5) ,-5) ,4) |step((transpose(X,4) |transpose(X,-5) ) ,12) ) ,4) ) +transpose(((step(((X|X) +transpose(X,7) ) ,12) |((X+transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ) +arpeggio(X) ) ,7) ) +(((((transpose(echo(X,4,6) ,4) +transpose((X+transpose(X,7) ) ,4) ) +transpose(((echo(X,4,6) +transpose(X,12) ) +transpose(X,7) ) ,7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,12) ) +echo(((X+X) |(X+transpose(X,12) ) ) ,4,6) ) +step(arpeggio(transpose(arpeggio(X) ,-5) ) ,12) ) ) ,4,6) ,7) ) ,-5) +transpose(echo(shuffle(((transpose(transpose(transpose((((arpeggio((X+transpose(X,7) ) ) +(X+X) ) +transpose(transpose(((X|X) +transpose(X,-7) ) ,4) ,4) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,-5) ,4) ,4) +((transpose(X,4) +(echo(X,4,6) |echo((X+transpose(X,12) ) ,4,6) ) ) +transpose(transpose((transpose((X+X) ,4) +transpose((X+arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,12) ) ,-5) ,12) ) ) +((echo(transpose(transpose(X,4) ,-7) ,4,6) +transpose((step(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |echo(X,4,6) ) ,4) ,12) +transpose(((X+transpose(X,12) ) |step(shuffle((X|X) ) ,12) ) ,12) ) ,7) ) |echo(arpeggio(arpeggio(transpose(((transpose((X+X) ,4) +X) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) ,4) ) ) ,4,6) ) ) ) ,4,6) ,4) ) +transpose(((X+transpose(X,7) ) +(((X+X) |X) +transpose(transpose(X,-7) ,12) ) ) ,7) ) ,-7) ) ,7) ) |(((((transpose(transpose(transpose(transpose((echo(shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,4,6) |((X+transpose(step((X+X) ,12) ,4) ) +transpose(((X+X) |step(X,12) ) ,7) ) ) ,4) ,-7) ,-5) ,4) +transpose(((echo(transpose((((transpose(X,4) +transpose(X,4) ) |(step(X,12) +X) ) |(((((X+transpose((X|X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose((X|X) ,-7) ) ) ,-7) ,4,6) +transpose(transpose(arpeggio(transpose(transpose((step(step(arpeggio(X) ,12) ,12) +transpose(echo((transpose(X,-5) +transpose(X,7) ) ,4,6) ,-5) ) ,-5) ,4) ) ,4) ,4) ) +transpose((transpose(transpose((X+transpose(X,12) ) ,4) ,-5) |((shuffle((X|(X|X) ) ) +transpose((((X+X) +transpose(X,12) ) +X) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,7) ) ,4) ) +transpose(((shuffle(echo(transpose((arpeggio((shuffle(X) |X) ) +(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(X,7) ) ) ,4) ,4,6) ) +transpose((((((echo(transpose(X,-5) ,4,6) +shuffle(X) ) +((arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(echo((X+X) ,4,6) ,4) ) +transpose(X,7) ) ) +echo(echo(echo((X+X) ,4,6) ,4,6) ,4,6) ) |(transpose(transpose((X+transpose(X,7) ) ,-5) ,-5) +transpose(echo(shuffle(transpose(arpeggio(X) ,4) ) ,4,6) ,-5) ) ) +(transpose(transpose(arpeggio(echo(X,4,6) ) ,4) ,-7) +transpose((((X+X) +(X+transpose(X,-5) ) ) +transpose(transpose(X,4) ,-5) ) ,12) ) ) ,12) ) +((transpose(transpose((shuffle(transpose((X|X) ,4) ) +transpose(((transpose(echo(X,4,6) ,-5) +transpose(transpose(X,4) ,4) ) +transpose((X|transpose(X,4) ) ,7) ) ,12) ) ,-7) ,-5) +transpose(transpose(transpose((transpose(((X+transpose((X+transpose(X,7) ) ,7) ) +step(transpose(X,4) ,12) ) ,-7) |(transpose(arpeggio(X) ,4) +transpose(((transpose((step(X,12) +(X|X) ) ,-5) +transpose((X|X) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) ) ,-5) ,-5) ,12) ) |((((shuffle(transpose(X,4) ) |X) |((transpose(((echo(X,4,6) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) +transpose(((X|X) +transpose(arpeggio(X) ,12) ) ,4) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) ) |((transpose(X,4) +transpose(transpose((shuffle((X+X) ) +transpose(((X+X) +transpose(echo(X,4,6) ,7) ) ,12) ) ,4) ,4) ) +transpose(((X|X) |(X|X) ) ,7) ) ) +arpeggio(transpose(transpose((((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((X+X) ,12) ) ,-7) ,-5) ) ) ) ) ,7) ) |transpose(transpose(arpeggio((((transpose(X,-7) |transpose(X,-7) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,12) ) +((transpose((X|X) ,-5) +transpose(shuffle(shuffle(X) ) ,7) ) +transpose(step(transpose(X,-5) ,12) ,-5) ) ) ) ,-7) ,-7) ) +((((transpose(transpose(echo((step((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-5) ) ,12) +transpose(arpeggio(X) ,4) ) ,4,6) ,4) ,-5) +transpose((arpeggio(transpose(shuffle(((shuffle(((arpeggio(X) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ) +transpose(step((X+transpose(X,7) ) ,12) ,4) ) +transpose((X|X) ,7) ) ) ,-5) ) |shuffle(transpose(echo((((X+transpose(X,12) ) |arpeggio((X+X) ) ) +(transpose(X,-7) +X) ) ,4,6) ,-5) ) ) ,12) ) +(transpose(shuffle(((arpeggio((shuffle(transpose((X+X) ,-7) ) +transpose(X,-5) ) ) +transpose(shuffle(echo(echo((X|X) ,4,6) ,4,6) ) ,7) ) +(step(X,12) +transpose(transpose(X,-7) ,-7) ) ) ) ,-7) +((arpeggio((((transpose(X,-7) +transpose(transpose(X,-7) ,12) ) |step(X,12) ) |transpose(transpose(X,4) ,-7) ) ) +shuffle(arpeggio(transpose(transpose(arpeggio(transpose(X,-5) ) ,-5) ,-7) ) ) ) +transpose((transpose((transpose(((X+transpose(transpose(X,4) ,12) ) +transpose(step(X,12) ,-7) ) ,-5) +transpose(((((arpeggio(X) +transpose(echo(X,4,6) ,4) ) +transpose((X+X) ,7) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) ,-7) ) ,-7) |transpose((X+transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ,-7) ) ,7) ) ) ) +transpose(echo(transpose(step((((((arpeggio(X) +transpose(echo((((X|X) +(X+X) ) +transpose((transpose(X,-7) +(X+X) ) ,12) ) ,4,6) ,4) ) +transpose(((X+transpose(shuffle(X) ,4) ) +transpose((X+X) ,7) ) ,7) ) +transpose((((echo(step(X,12) ,4,6) |step(X,12) ) +(X+transpose(shuffle(shuffle(X) ) ,7) ) ) +transpose(transpose(shuffle((X+transpose((X+X) ,12) ) ) ,-7) ,12) ) ,4) ) +transpose(((X+transpose(shuffle(transpose(X,4) ) ,-7) ) |(transpose((X+transpose(X,7) ) ,-7) +transpose(arpeggio(arpeggio((X+transpose(transpose(X,-7) ,7) ) ) ) ,7) ) ) ,7) ) +echo((transpose(((((X+transpose(X,12) ) +transpose(X,-5) ) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) |(transpose((echo(X,4,6) +transpose(transpose(X,4) ,7) ) ,-7) +transpose(((X+transpose(X,7) ) +X) ,4) ) ) ,4,6) ) ,12) ,-5) ,4,6) ,4) ) +transpose(transpose(transpose(shuffle((((arpeggio((transpose(X,4) +X) ) +(X+transpose(X,7) ) ) +transpose(X,-7) ) +transpose(step(transpose((shuffle(transpose((X+transpose(X,7) ) ,-5) ) +transpose(((((X+transpose(X,7) ) +transpose((X+X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(X,7) ) ,12) ) ,-7) ,12) ,12) ) ) ,-5) ,-5) ,7) ) ) +transpose((transpose(transpose((shuffle(((((transpose((step(transpose(X,4) ,12) +transpose(echo((X+X) ,4,6) ,4) ) ,-5) +transpose(shuffle(transpose((X+X) ,-7) ) ,4) ) +transpose(echo((((transpose(X,4) +transpose(transpose(arpeggio((transpose(X,4) +transpose(X,7) ) ) ,-5) ,4) ) +transpose(transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,7) ) +(transpose((step(X,12) |(X+transpose(X,7) ) ) ,-5) +transpose((((X+transpose(X,-7) ) +transpose((X|X) ,4) ) +transpose(X,7) ) ,7) ) ) ,4,6) ,7) ) +transpose(transpose((arpeggio(transpose(((X+X) +transpose(transpose(X,-5) ,7) ) ,-5) ) +transpose(transpose(((X+X) +transpose(step(X,12) ,4) ) ,4) ,7) ) ,4) ,4) ) +transpose((arpeggio(transpose((X|X) ,4) ) +arpeggio(step((((X+X) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ) ,7) ) ) +transpose(shuffle(transpose(transpose((transpose(transpose(transpose(((arpeggio(X) +transpose(transpose(X,-7) ,7) ) |echo(echo(X,4,6) ,4,6) ) ,-5) ,4) ,-5) |arpeggio(arpeggio(transpose((transpose(step(transpose(X,-5) ,12) ,4) +transpose(transpose((X+transpose(X,12) ) ,4) ,12) ) ,-7) ) ) ) ,-5) ,-7) ) ,7) ) ,-7) ,-7) +((arpeggio(step(((transpose(transpose(transpose(X,-7) ,-7) ,4) +(X|arpeggio(X) ) ) +transpose(transpose((X|transpose((X+transpose(X,12) ) ,-5) ) ,-7) ,7) ) ,12) ) +transpose(shuffle((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) ) ,4) ) +transpose(transpose(transpose((echo(transpose(transpose((arpeggio(X) |arpeggio(X) ) ,-7) ,4) ,4,6) |echo(step(transpose(X,4) ,12) ,4,6) ) ,-5) ,-7) ,7) ) ) ,7) ) ) +transpose((transpose(((transpose(shuffle(transpose(((((echo((transpose(transpose(X,4) ,-5) +transpose((transpose(X,-5) +transpose(X,12) ) ,12) ) ,4,6) +((transpose(X,4) +transpose(step(X,12) ,12) ) +((transpose(X,-5) +X) |transpose(X,4) ) ) ) +transpose((shuffle(transpose(((X|X) +transpose(shuffle(transpose(X,4) ) ,7) ) ,-5) ) +transpose((X+transpose(X,7) ) ,-5) ) ,4) ) +transpose(((transpose(step(X,12) ,-7) +transpose(transpose(arpeggio(X) ,4) ,12) ) +(echo(((echo(X,4,6) +transpose(X,4) ) +transpose(X,7) ) ,4,6) |echo(arpeggio(transpose((X+X) ,4) ) ,4,6) ) ) ,7) ) +transpose((transpose(step((shuffle(X) +transpose(echo(X,4,6) ,12) ) ,12) ,-7) +(step(X,12) +transpose(X,12) ) ) ,4) ) ,4) ) ,-7) +transpose(((echo((transpose(echo((((X+transpose(X,12) ) |transpose(X,4) ) +transpose(transpose(transpose((X+X) ,4) ,-7) ,12) ) ,4,6) ,4) |echo((transpose(transpose(X,-7) ,-7) +transpose(arpeggio(X) ,7) ) ,4,6) ) ,4,6) |(((echo(transpose(transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,4) ,4,6) |(((transpose(X,4) |((X|X) |(X+X) ) ) +transpose((X+transpose(transpose(X,4) ,12) ) ,12) ) +transpose((((((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) |transpose(transpose(X,-5) ,-5) ) ,7) ) ) +transpose(shuffle(echo(((transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,4) +transpose((echo(((X+transpose((X+X) ,4) ) +transpose((X+X) ,7) ) ,4,6) +(((X+transpose(X,4) ) +transpose(X,7) ) |(echo(X,4,6) +X) ) ) ,4) ) +transpose((X|transpose(transpose(X,-7) ,-7) ) ,7) ) ,4,6) ) ,12) ) +transpose(transpose((transpose(((X+transpose(step(X,12) ,4) ) +transpose((transpose(X,-7) +transpose(X,7) ) ,7) ) ,-5) +(transpose((X+(X+X) ) ,-5) +shuffle(transpose((X+transpose(X,7) ) ,-5) ) ) ) ,-7) ,7) ) ) +echo(transpose((arpeggio((X+transpose(transpose(X,-7) ,7) ) ) |transpose((echo(X,4,6) |step(transpose(X,4) ,12) ) ,-7) ) ,4) ,4,6) ) ,12) ) +transpose(echo(transpose(transpose((transpose(((((((X+transpose(X,7) ) +(X+X) ) +transpose((echo((X+transpose(X,7) ) ,4,6) +transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(transpose(((X+X) +transpose(transpose(X,-7) ,12) ) ,-5) ,12) ) ,7) ) ,-7) +transpose(((arpeggio(((X+transpose(X,7) ) +transpose(X,7) ) ) +step(((X+transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) +transpose((transpose(transpose(transpose(X,-5) ,4) ,-7) +((X+transpose(X,7) ) +transpose((X|X) ,-5) ) ) ,12) ) ,7) ) ,4) ,-5) ,4,6) ,7) ) ,-5) +transpose((transpose(((transpose((transpose(transpose(transpose((X+X) ,-7) ,4) ,-5) +transpose((transpose((transpose(((transpose((X+X) ,4) +transpose((X|(X+transpose(X,12) ) ) ,12) ) +transpose(arpeggio(step(X,12) ) ,-5) ) ,4) +echo(arpeggio((echo((X+transpose(X,12) ) ,4,6) +transpose(X,12) ) ) ,4,6) ) ,-5) +transpose((transpose((((transpose(X,-7) +X) +((X+X) +(X+transpose(X,7) ) ) ) +transpose(step((arpeggio(X) +transpose(X,-7) ) ,12) ,7) ) ,4) +((((echo(X,4,6) +transpose(transpose(X,-7) ,12) ) +transpose(arpeggio(X) ,7) ) |(X+transpose(X,7) ) ) +transpose((X|X) ,12) ) ) ,12) ) ,7) ) ,-5) +transpose(transpose((((shuffle(transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ) |step((shuffle(X) +transpose(X,-7) ) ,12) ) +(((((shuffle(echo((X+transpose(X,12) ) ,4,6) ) +transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,12) ) +transpose(transpose(X,-7) ,12) ) +transpose(((transpose((((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,-7) +transpose(transpose((X|X) ,-5) ,7) ) +transpose((((X+transpose(X,12) ) +transpose(X,12) ) +transpose(step((X|X) ,12) ,12) ) ,7) ) ,12) ) +(transpose(transpose((((X|X) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X|X) ,7) ) ,4) ,-7) +transpose(shuffle(((((X+X) |transpose(X,-5) ) +transpose(X,12) ) +step(X,12) ) ) ,12) ) ) +transpose((((transpose(transpose(transpose(X,4) ,-5) ,4) +transpose(transpose(arpeggio(X) ,4) ,12) ) +transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose(transpose((X+X) ,4) ,7) ) ,12) ) ) +((((((transpose((X+transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,7) ) ,4) +((X+X) +transpose(X,12) ) ) +transpose(((transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,-7) |echo(transpose(X,-7) ,4,6) ) +transpose((((transpose(shuffle(X) ,-7) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) +transpose(transpose(X,-7) ,12) ) ,7) ) ,12) ) +transpose((transpose(X,-7) +(step(transpose(X,4) ,12) +transpose(shuffle(X) ,12) ) ) ,7) ) |((shuffle((X|X) ) |(step(X,12) +transpose((arpeggio(X) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ) |arpeggio((((((X+transpose(X,12) ) +transpose((X|X) ,-7) ) +transpose(((X+X) +X) ,7) ) +transpose((arpeggio(X) +(echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ) ,4) ) +transpose(transpose(transpose(transpose(X,4) ,-5) ,-7) ,7) ) ) ) ) +transpose(transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((shuffle(X) |X) ,4) ) +transpose((X+transpose((X+X) ,7) ) ,7) ) +transpose((shuffle(X) |X) ,-7) ) ,-7) ,4) ) +transpose(shuffle(transpose((shuffle(step(X,12) ) +X) ,4) ) ,7) ) ) ,4) ,4) ) +transpose(step(((transpose(arpeggio(echo(transpose(((echo(X,4,6) +transpose(shuffle(X) ,7) ) +transpose((X+X) ,12) ) ,-7) ,4,6) ) ,-5) |transpose((shuffle((X+transpose(X,12) ) ) +transpose(echo((transpose(step(transpose(X,4) ,12) ,-5) |transpose(X,-7) ) ,4,6) ,12) ) ,-5) ) +transpose((shuffle((transpose(X,-7) |transpose(shuffle(X) ,-7) ) ) +transpose(transpose(transpose(((X+X) +transpose(X,7) ) ,-7) ,4) ,12) ) ,-5) ) ,12) ,7) ) ,4) |(transpose(transpose(transpose(echo((echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4,6) |transpose(transpose(X,-5) ,4) ) ,4,6) ,4) ,-5) ,4) +(echo((shuffle(((transpose((((X+transpose(X,7) ) +(transpose(X,4) +transpose(step(X,12) ,12) ) ) |((X+transpose(X,12) ) +transpose(X,12) ) ) ,-7) +transpose(echo((transpose(transpose((X+transpose(X,12) ) ,-7) ,-5) +(echo((X+transpose(X,7) ) ,4,6) +transpose(transpose(transpose(X,-5) ,-5) ,12) ) ) ,4,6) ,7) ) +transpose((transpose(step(transpose((X|(X+X) ) ,-5) ,12) ,4) +(X+transpose(X,7) ) ) ,12) ) ) +transpose(((((transpose(shuffle(((X+transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,7) ) |echo((X+transpose(X,7) ) ,4,6) ) ) ,-7) +transpose((echo(transpose(transpose(X,4) ,-7) ,4,6) +shuffle(((X|X) +transpose((((X+transpose(X,7) ) |(X+transpose(X,7) ) ) +transpose(transpose((X|X) ,-7) ,7) ) ,7) ) ) ) ,4) ) +transpose((transpose(((transpose(transpose(X,4) ,4) +(((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ) +(transpose((X+X) ,-5) +transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ) ,4) |step((transpose(X,4) +transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,12) ) ,7) ) +(((transpose(transpose((X+X) ,-7) ,4) +transpose(transpose(transpose((X|X) ,4) ,4) ,7) ) +transpose(transpose((X+(X+transpose(X,7) ) ) ,-7) ,-7) ) |transpose((X+transpose((((X+X) +transpose((X+transpose(X,-5) ) ,4) ) +transpose((X+X) ,7) ) ,12) ) ,-5) ) ) +step((((transpose(X,-5) |step((X+transpose(X,12) ) ,12) ) +transpose(((echo(((arpeggio(X) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,4,6) +((transpose(X,-5) |step(X,12) ) +transpose(transpose(X,4) ,7) ) ) +(transpose(X,-7) +transpose(transpose(X,-5) ,12) ) ) ,4) ) +transpose(echo(arpeggio(X) ,4,6) ,7) ) ,12) ) ,12) ) ,4,6) +transpose((((((((transpose((X+transpose(X,7) ) ,-5) +step(arpeggio(X) ,12) ) +transpose((X+X) ,-5) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose((((X+X) +transpose(transpose(X,4) ,7) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) ,-7) ,4) ) +transpose(step(echo((X+X) ,4,6) ,12) ,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-7) ) +transpose((echo(arpeggio((arpeggio(transpose(X,4) ) |(((transpose(X,-7) |echo(X,4,6) ) +transpose((transpose(X,4) +transpose(transpose(X,-5) ,7) ) ,7) ) +transpose((X|((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(echo(transpose(X,-7) ,4,6) ,4) ) +transpose((X+X) ,7) ) ) ,7) ) ) ) ,4,6) |(((arpeggio(step(((X+X) |X) ,12) ) +transpose(arpeggio(shuffle(transpose(transpose(X,-5) ,-7) ) ) ,4) ) +transpose(transpose(transpose(step(X,12) ,-7) ,4) ,7) ) +transpose(transpose(transpose(shuffle(arpeggio(shuffle(X) ) ) ,4) ,-5) ,7) ) ) ,12) ) ,12) ) ) ) ,-7) ) ,12) )
random seed used was 245007138

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