Home : Tune Toys : Expresso 
  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.

Transformations:
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Phrase for X:
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After 20 generations the expression "X" became this:
(transpose((arpeggio(echo(echo((((((transpose((transpose(transpose(X,-7) ,-5) +(arpeggio(transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(transpose(transpose(X,-5) ,-5) ,-5) ,7) ) ) ,-7) |((transpose(transpose((((X+transpose(X,12) ) |(X+X) ) +arpeggio(((transpose(X,-7) +transpose(X,4) ) +transpose(X,7) ) ) ) ,-5) ,-5) +transpose((transpose(X,-5) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ) |((transpose((X+transpose(X,12) ) ,-5) +transpose((echo(X,4,6) +transpose((X+transpose(transpose(X,-7) ,12) ) ,12) ) ,7) ) +(((transpose(transpose(X,-7) ,4) |arpeggio(X) ) +(transpose(arpeggio((X+transpose(X,7) ) ) ,-5) +transpose(((X+X) +transpose(X,7) ) ,7) ) ) |step((transpose((X+X) ,-7) +transpose((step(X,12) +transpose(transpose(X,4) ,12) ) ,7) ) ,12) ) ) ) ) +((((((((X+transpose(X,4) ) +transpose(X,7) ) |((X+transpose(X,7) ) +step(X,12) ) ) |echo(X,4,6) ) +transpose((X|X) ,4) ) +transpose(transpose(transpose(X,-7) ,-5) ,12) ) +transpose(transpose(transpose(arpeggio(transpose(echo(X,4,6) ,-5) ) ,-7) ,4) ,4) ) +transpose(step(((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(transpose(X,-7) ,-7) ) +transpose((arpeggio(X) +transpose((X+transpose(X,4) ) ,12) ) ,7) ) ,12) ,7) ) ) +transpose(transpose(transpose(echo(((arpeggio(X) |((((X+transpose(X,4) ) +transpose(X,7) ) +((((X+X) +transpose(X,12) ) +transpose(step(X,12) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) ) |(transpose(transpose(arpeggio(X) ,-7) ,-5) |transpose(transpose(X,4) ,4) ) ) ) |((transpose(transpose(X,4) ,4) |(transpose(X,-7) +transpose(transpose(step(X,12) ,-7) ,12) ) ) +((((step((X+X) ,12) +transpose(echo(echo(X,4,6) ,4,6) ,4) ) +transpose(X,7) ) |shuffle(X) ) +step(transpose(step((X|X) ,12) ,4) ,12) ) ) ) ,4,6) ,4) ,4) ,12) ) +step((((((step(((X+echo(X,4,6) ) +transpose((X+transpose(echo(X,4,6) ,12) ) ,12) ) ,12) +shuffle(echo(arpeggio(X) ,4,6) ) ) +transpose((((X|(X+transpose(X,12) ) ) +X) |echo(transpose(X,-5) ,4,6) ) ,12) ) |(transpose(transpose(transpose(arpeggio(X) ,-7) ,4) ,4) |(arpeggio((X+step((X+X) ,12) ) ) +((transpose(X,-7) +transpose(X,12) ) +((X+transpose(X,7) ) |transpose((X+X) ,-7) ) ) ) ) ) +transpose((step((transpose(transpose(((X|X) +transpose(X,-5) ) ,-7) ,4) +step(transpose((echo(X,4,6) +(X+transpose(X,7) ) ) ,-5) ,12) ) ,12) +transpose(((step(transpose((X|X) ,4) ,12) +transpose(step((((X+transpose(X,7) ) +transpose(((X|X) +transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) ,12) ,4) ) +transpose(transpose(((transpose(X,4) +X) |(((X|X) +transpose(X,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4) ,7) ) ,-5) ) ,4) ) +transpose((((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(((X+X) +transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose((arpeggio(X) +(X+transpose(X,4) ) ) ,7) ) +echo(X,4,6) ) +transpose(((transpose(transpose(shuffle(X) ,-7) ,-5) +transpose((arpeggio((X+transpose(X,7) ) ) |transpose(X,-5) ) ,4) ) +transpose(arpeggio((transpose(X,-5) +transpose(echo(X,4,6) ,7) ) ) ,7) ) ,7) ) +((transpose(echo(transpose(X,-7) ,4,6) ,-5) +transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,4) ) +transpose(transpose((step((transpose(X,-7) +transpose((X+X) ,12) ) ,12) +transpose(((X+transpose(transpose(X,-7) ,12) ) +transpose((X|X) ,12) ) ,7) ) ,-7) ,7) ) ) ,7) ) ,12) ) +transpose(((shuffle(((transpose(transpose((step(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) +transpose(((transpose(transpose(X,4) ,4) +transpose((((X+transpose(X,12) ) +transpose(transpose(X,-7) ,4) ) +transpose((step(X,12) +(X+transpose(X,7) ) ) ,7) ) ,4) ) +transpose(transpose(transpose(echo(X,4,6) ,-5) ,4) ,7) ) ,7) ) ,-5) ,-5) +transpose(transpose(transpose((arpeggio(shuffle(step(transpose(X,4) ,12) ) ) +(transpose((X|X) ,4) +transpose((X+transpose(X,-7) ) ,12) ) ) ,-7) ,4) ,4) ) +transpose(((((transpose(X,-5) +echo(transpose(X,-5) ,4,6) ) +transpose((((X+transpose(X,7) ) |((echo(X,4,6) +transpose(X,4) ) +transpose(X,7) ) ) |(step(X,12) +transpose((X+X) ,7) ) ) ,12) ) +transpose(transpose(echo(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,4) ,4) ) +transpose((echo(step((echo(X,4,6) +(X|X) ) ,12) ,4,6) +shuffle((((X|(X+X) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,7) ) ) ) ,7) ) ,7) ) ) |arpeggio(echo(transpose(((echo(shuffle(X) ,4,6) +(((((X|X) |(X+X) ) +transpose(transpose(shuffle(transpose(X,-5) ) ,4) ,4) ) +transpose(X,7) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ) +transpose((transpose(X,4) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,-7) ,4,6) ) ) +transpose(arpeggio((((transpose(X,-5) |(((X+transpose(((transpose(X,4) |(X+X) ) |step((X+transpose(X,12) ) ,12) ) ,4) ) +transpose(((X+X) +transpose(X,7) ) ,7) ) |(((X+transpose(X,4) ) +transpose(arpeggio(arpeggio(X) ) ,7) ) +transpose(arpeggio(X) ,7) ) ) ) +((transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,7) ) ) ,4) |transpose(step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ,-5) ) +transpose(arpeggio((arpeggio(transpose(X,-5) ) +transpose((step(X,12) +transpose(X,-7) ) ,7) ) ) ,12) ) ) +transpose(step((arpeggio((((X+X) +transpose((X|X) ,7) ) +transpose(X,-5) ) ) +transpose((transpose((X+X) ,4) |X) ,7) ) ,12) ,7) ) ) ,7) ) ,7) ) ,4,6) ,4,6) ) +echo((arpeggio(((((((transpose(transpose(step(((transpose(transpose(X,-5) ,-7) |X) |transpose(transpose(X,-7) ,-7) ) ,12) ,-7) ,-5) +transpose((transpose(shuffle(transpose(X,-5) ) ,-7) +transpose(transpose((X|(X+transpose(X,12) ) ) ,-7) ,12) ) ,12) ) +transpose(transpose(transpose(transpose(arpeggio(transpose(transpose(transpose(X,4) ,-7) ,-5) ) ,4) ,4) ,-7) ,4) ) +transpose(transpose(shuffle(echo(echo((shuffle(X) |transpose(X,4) ) ,4,6) ,4,6) ) ,4) ,7) ) +transpose(((transpose(transpose(X,4) ,-5) +transpose(X,12) ) |transpose(transpose(X,4) ,-7) ) ,4) ) |transpose((((echo(((transpose(X,-7) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,4,6) +transpose(arpeggio(arpeggio(X) ) ,7) ) +transpose(transpose((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,7) ) ,4) +transpose(arpeggio((X+X) ) ,12) ) ,-5) ,-5) ) +((arpeggio(transpose(arpeggio(X) ,4) ) +transpose(transpose(transpose((X+X) ,4) ,-5) ,4) ) +transpose((shuffle(X) |((echo(transpose(transpose(X,4) ,-5) ,4,6) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,7) ) ) ,-5) ) +transpose((((((transpose(X,-7) +transpose(transpose(transpose(((X|X) +(X+X) ) ,4) ,-7) ,12) ) |arpeggio(echo(step(echo(X,4,6) ,12) ,4,6) ) ) +transpose(transpose((X+transpose(X,4) ) ,-5) ,12) ) +step(transpose(transpose(transpose((X+X) ,-7) ,-5) ,-7) ,12) ) +transpose(echo(echo(step(transpose(shuffle((transpose((X|shuffle(X) ) ,4) |(transpose(X,-7) +transpose(transpose(X,-5) ,12) ) ) ) ,-5) ,12) ,4,6) ,4,6) ,7) ) ,12) ) ) +transpose(arpeggio(((arpeggio(transpose((((arpeggio(X) +transpose(echo((X|X) ,4,6) ,12) ) |echo(step(X,12) ,4,6) ) +transpose((transpose(echo(echo((X+transpose(X,12) ) ,4,6) ,4,6) ,-7) +transpose(transpose(echo(arpeggio(X) ,4,6) ,4) ,7) ) ,12) ) ,-5) ) +transpose(((transpose(transpose(transpose(transpose(X,-7) ,-7) ,-7) ,4) +transpose(transpose(transpose(step(echo(transpose(X,4) ,4,6) ,12) ,4) ,-5) ,4) ) +transpose(transpose(shuffle((((transpose(X,4) |((X+transpose(X,4) ) +transpose(X,7) ) ) |X) +transpose(transpose(echo((transpose(X,4) |transpose(X,-7) ) ,4,6) ,4) ,7) ) ) ,4) ,7) ) ,12) ) |((transpose((((echo(((X|arpeggio(shuffle(X) ) ) +transpose((echo(X,4,6) +echo(X,4,6) ) ,12) ) ,4,6) +transpose(transpose(transpose(echo(X,4,6) ,-7) ,-7) ,12) ) |echo(transpose(transpose(step((transpose(X,4) |X) ,12) ,-5) ,-5) ,4,6) ) +transpose(transpose(arpeggio(transpose(arpeggio((transpose(X,4) |(X|echo(X,4,6) ) ) ) ,-5) ) ,-7) ,12) ) ,-5) +transpose(shuffle(transpose((shuffle((X+transpose(X,12) ) ) +transpose(arpeggio(((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) ) ,12) ) ,-5) ) ,-7) ) +transpose(((transpose(transpose(shuffle(transpose(transpose(transpose(transpose(X,-7) ,-7) ,-5) ,-7) ) ,4) ,-7) |(transpose(transpose(transpose(transpose(step(transpose(X,-5) ,12) ,-5) ,-5) ,-7) ,-5) +echo(transpose(transpose(arpeggio(step((X+transpose(X,7) ) ,12) ) ,-7) ,-5) ,4,6) ) ) |(arpeggio(shuffle(transpose(X,-7) ) ) |(((shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(step(transpose(X,-5) ,12) ,12) ) +(((((X+transpose(X,7) ) +(transpose(X,-7) +transpose((X|(X|X) ) ,7) ) ) +transpose(step(transpose(X,-7) ,12) ,4) ) +transpose(step((transpose(X,-5) |transpose(X,-5) ) ,12) ,7) ) +shuffle((transpose(((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) +(arpeggio(transpose(X,-7) ) |transpose(X,-5) ) ) ) ) ) |transpose(echo(((step(X,12) |shuffle(X) ) +transpose((transpose(X,4) +transpose((transpose(X,4) |transpose(X,-5) ) ,12) ) ,12) ) ,4,6) ,4) ) ) ) ,12) ) ) ) ,7) ) ,4,6) ) ,4) +transpose(((echo(((transpose(((transpose(((((shuffle(transpose((X|X) ,-5) ) +(X|arpeggio(X) ) ) |(transpose(((X+X) |transpose(X,-7) ) ,-7) |(transpose((X+X) ,-5) +transpose(transpose((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-5) ,7) ) ) ) +transpose(step((arpeggio(X) +((transpose(X,4) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X|X) ,7) ) ) ,12) ,4) ) +transpose((transpose(echo(((transpose(X,4) +((step(X,12) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,12) ) ,4,6) ,-5) +transpose(transpose(transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) ,4) ,-7) ,12) ) ,7) ) ,-5) +transpose((((((shuffle(X) +X) +step(X,12) ) +transpose(transpose(transpose((transpose(X,-7) |transpose(X,4) ) ,-5) ,4) ,7) ) +transpose(transpose(transpose(arpeggio(transpose(transpose(X,4) ,4) ) ,4) ,-7) ,7) ) |step(step((transpose(transpose(step(X,12) ,4) ,-7) +((echo((X+transpose(X,12) ) ,4,6) +transpose(((X+transpose(X,12) ) +transpose((shuffle(X) +(X+transpose(X,7) ) ) ,12) ) ,4) ) +transpose(((X|transpose(transpose(X,-5) ,4) ) +transpose(X,4) ) ,7) ) ) ,12) ,12) ) ,12) ) +(transpose(transpose((((X|X) +(X+X) ) +transpose(X,4) ) ,-5) ,-7) +transpose((transpose((transpose(transpose(X,4) ,-7) |transpose((X+transpose(X,7) ) ,-7) ) ,4) +transpose(transpose((((X+transpose(X,12) ) |transpose((X+X) ,-7) ) +(((((transpose(X,-7) +transpose(X,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,12) ) +transpose(transpose(((arpeggio(X) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-7) ,4) ) +transpose(X,7) ) +echo(transpose(X,-5) ,4,6) ) ) ,-7) ,12) ) ,12) ) ) ,-7) +transpose((transpose(transpose((echo((X+transpose(echo((X+transpose(X,12) ) ,4,6) ,12) ) ,4,6) +transpose((step(arpeggio(transpose(X,4) ) ,12) +((transpose(transpose(X,4) ,4) +transpose((step(X,12) +transpose(X,7) ) ,4) ) +transpose((((X|X) +transpose(X,4) ) +transpose((X|X) ,7) ) ,7) ) ) ,12) ) ,-5) ,-7) |transpose(echo((transpose((transpose((X+X) ,-7) +echo(transpose(((X+X) |X) ,-5) ,4,6) ) ,-5) +transpose(shuffle((transpose(X,-5) +transpose(transpose(X,-7) ,7) ) ) ,12) ) ,4,6) ,-5) ) ,4) ) +transpose((transpose(((((shuffle(step(transpose(X,-5) ,12) ) +transpose(transpose(arpeggio(echo(X,4,6) ) ,4) ,12) ) +transpose(((((shuffle(X) |(X+transpose(X,7) ) ) +(X+transpose(X,7) ) ) +transpose(echo(arpeggio(transpose(X,-7) ) ,4,6) ,12) ) +(transpose(step(X,12) ,-7) +transpose((((X+X) +X) +transpose((transpose(transpose(transpose(X,4) ,-5) ,4) +transpose((transpose(X,-5) |step(X,12) ) ,12) ) ,12) ) ,7) ) ) ,4) ) +transpose(shuffle(shuffle(((X+X) |echo(echo(X,4,6) ,4,6) ) ) ) ,7) ) +transpose((transpose(arpeggio(X) ,-5) +transpose(arpeggio((arpeggio((shuffle(X) +transpose((transpose((X+transpose(X,12) ) ,4) +transpose((echo(X,4,6) +transpose(X,12) ) ,4) ) ,12) ) ) +echo(shuffle(X) ,4,6) ) ) ,7) ) ,7) ) ,4) +transpose((shuffle(transpose(transpose((transpose((transpose(X,4) +transpose(transpose(step(X,12) ,4) ,12) ) ,-5) +transpose(transpose(X,4) ,7) ) ,4) ,4) ) +arpeggio(((step((transpose(transpose(transpose(X,4) ,4) ,-5) |X) ,12) +transpose(((transpose(transpose(X,4) ,4) +transpose(transpose(shuffle(X) ,4) ,4) ) +transpose((((X+X) +transpose(arpeggio(X) ,12) ) |((step((X+X) ,12) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose((transpose(X,-7) +transpose(transpose(X,-7) ,12) ) ,7) ) ) ,7) ) ,7) ) +transpose(transpose(transpose((echo(X,4,6) +transpose((((X+transpose(X,12) ) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,12) ) ,-5) ,-5) ,4) ) ) ) ,12) ) ,7) ) ,4,6) +transpose(transpose(transpose(arpeggio((transpose(shuffle(transpose(transpose(step((X+((arpeggio(X) +transpose(arpeggio(X) ,4) ) +transpose(transpose(step(X,12) ,-7) ,7) ) ) ,12) ,4) ,4) ) ,-5) +transpose((transpose((((transpose(X,-5) +(transpose(X,-5) |(echo(X,4,6) +transpose(X,-7) ) ) ) |(shuffle(((step(X,12) +transpose(X,7) ) +transpose(X,7) ) ) +((transpose((X|(transpose(X,-5) +transpose(X,12) ) ) ,4) +transpose(((transpose(X,-5) +transpose(X,4) ) +transpose((X|X) ,7) ) ,4) ) +transpose(transpose(transpose(transpose(X,-5) ,-7) ,-5) ,7) ) ) ) |transpose(transpose(transpose(X,-5) ,4) ,-5) ) ,-5) |((((transpose(arpeggio(X) ,-5) +arpeggio(shuffle(X) ) ) +transpose((transpose(X,-7) +transpose(X,7) ) ,4) ) +transpose(arpeggio(((X|X) +transpose((X+X) ,12) ) ) ,7) ) +transpose(transpose(transpose(step(arpeggio((X|(X+transpose(X,7) ) ) ) ,12) ,4) ,4) ,7) ) ) ,12) ) ) ,4) ,4) ,7) ) +transpose(transpose(echo(((transpose(transpose(arpeggio((shuffle(echo(((transpose(X,4) +transpose(((transpose(X,-7) +transpose(((X+X) |shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4) ) +transpose((X|X) ,7) ) ,4) ) +transpose((transpose(shuffle(X) ,-7) +transpose((X+transpose((X|X) ,12) ) ,12) ) ,7) ) ,4,6) ) |((((X+X) |transpose(X,4) ) +transpose((shuffle((X|X) ) |arpeggio(transpose(X,4) ) ) ,4) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ) ) ,-7) ,-5) +transpose((echo(echo((((step(echo(echo(X,4,6) ,4,6) ,12) +transpose(echo(transpose(echo(X,4,6) ,-7) ,4,6) ,4) ) +transpose(((transpose(transpose(((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,-5) ,-7) +transpose(((transpose((transpose(X,-5) +transpose(shuffle(X) ,7) ) ,-7) |arpeggio(arpeggio(X) ) ) +(arpeggio(transpose(X,4) ) +transpose((step((X|X) ,12) +X) ,7) ) ) ,4) ) +transpose(transpose(transpose((((transpose(X,-5) +transpose(transpose(X,-7) ,7) ) +transpose((X+X) ,7) ) |(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,-7) ,-7) ,7) ) ,7) ) |transpose((arpeggio(transpose((step(((shuffle(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) |(arpeggio((X+transpose(X,7) ) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,-5) ) +transpose((transpose(((X+transpose((X|X) ,4) ) +transpose(arpeggio(X) ,7) ) ,4) |transpose(echo(transpose(transpose(X,-5) ,-7) ,4,6) ,-5) ) ,-7) ) ,-7) ) ,4,6) ,4,6) +(shuffle((transpose(echo(((transpose(X,-5) +transpose(X,12) ) +((X+transpose(X,12) ) +(X|X) ) ) ,4,6) ,-7) +((step((((X+X) +transpose(arpeggio(echo(X,4,6) ) ,12) ) +transpose(shuffle((echo(X,4,6) +transpose(X,12) ) ) ,7) ) ,12) +transpose((transpose(X,4) +transpose((((X+transpose(X,12) ) +transpose(X,-7) ) +X) ,12) ) ,7) ) +transpose(transpose((arpeggio(X) +transpose((X|X) ,12) ) ,4) ,7) ) ) ) +transpose(((((transpose(step(arpeggio(((shuffle(transpose(X,-7) ) +transpose((step((X+X) ,12) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose((transpose(transpose(X,-7) ,-7) +(((X+transpose(transpose(X,4) ,12) ) +transpose(shuffle(transpose(X,-5) ) ,4) ) +transpose((X+(X|X) ) ,7) ) ) ,7) ) ) ,12) ,-5) +transpose(((echo(((step(X,12) |(echo(X,4,6) +transpose(transpose(X,4) ,12) ) ) +transpose(transpose((step(X,12) +transpose((X+transpose(X,7) ) ,7) ) ,-5) ,12) ) ,4,6) |arpeggio((arpeggio(X) |transpose(X,4) ) ) ) |transpose(transpose(X,-7) ,-5) ) ,7) ) +transpose((transpose(((arpeggio(X) |((echo(X,4,6) |transpose(X,4) ) |((X+transpose(X,12) ) +echo(X,4,6) ) ) ) +transpose(transpose(X,-7) ,4) ) ,4) +transpose((transpose(echo(transpose(transpose(transpose(transpose(X,-7) ,4) ,-5) ,-5) ,4,6) ,-7) +transpose((((((transpose(transpose(X,-5) ,-5) +transpose(((((X+transpose(transpose(X,-5) ,12) ) +transpose((X|X) ,7) ) +transpose(((transpose(X,4) +transpose(X,12) ) +transpose(transpose(X,4) ,12) ) ,4) ) +transpose(shuffle((X+X) ) ,7) ) ,4) ) +transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,7) ) +transpose(shuffle(((X+transpose(X,7) ) +transpose((transpose(X,-5) +arpeggio(X) ) ,12) ) ) ,7) ) +transpose(transpose(arpeggio(transpose((transpose(X,-5) +transpose(transpose(X,-7) ,7) ) ,-7) ) ,4) ,-7) ) +transpose(transpose((step(step(transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) ,-5) ,12) ,12) |transpose((X+transpose(X,12) ) ,-5) ) ,-7) ,7) ) ,12) ) ,7) ) ,4) ) +transpose(transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,-7) ,-5) ,7) ) +(arpeggio(transpose(transpose((shuffle(X) +transpose(transpose(X,-7) ,12) ) ,-5) ,4) ) |(arpeggio((arpeggio(transpose(((X|X) |X) ,-7) ) +transpose(shuffle(((X+X) +X) ) ,12) ) ) +transpose(echo(X,4,6) ,7) ) ) ) ,7) ) ) ,4) ) +transpose((step((transpose(transpose(step(shuffle(((((X+transpose(X,12) ) +transpose((X+X) ,7) ) +X) +((((X+transpose(X,12) ) +transpose(transpose(X,4) ,4) ) +transpose(step(arpeggio(X) ,12) ,7) ) +transpose((transpose(X,4) +transpose(transpose(X,-5) ,7) ) ,12) ) ) ) ,12) ,-7) ,-7) +((((((X+transpose(X,4) ) +transpose(X,7) ) |X) +transpose(X,-5) ) +transpose(((arpeggio(X) |echo(X,4,6) ) +(X+X) ) ,7) ) +((step(transpose(transpose(transpose(X,4) ,4) ,4) ,12) +transpose(((echo(transpose((X|X) ,4) ,4,6) +(X|shuffle(step(X,12) ) ) ) |(transpose(X,-7) +transpose(transpose(X,-7) ,12) ) ) ,4) ) +transpose(((transpose(arpeggio(X) ,4) |transpose(transpose(echo(X,4,6) ,-7) ,-5) ) +transpose((transpose(X,4) +step(X,12) ) ,12) ) ,7) ) ) ) ,12) +transpose(transpose((echo(transpose(transpose((((X|X) |X) +transpose(echo(X,4,6) ,7) ) ,-5) ,-7) ,4,6) +transpose(((step((arpeggio((((X|(X+transpose(X,7) ) ) +transpose(X,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |shuffle(X) ) ,7) ) ) +(transpose(transpose(X,-7) ,-7) |(transpose(X,-7) +echo(transpose(X,-7) ,4,6) ) ) ) ,12) +arpeggio(((X+transpose((X+transpose(X,7) ) ,12) ) +echo(transpose(X,4) ,4,6) ) ) ) |((X|X) +transpose(X,-7) ) ) ,7) ) ,-5) ,12) ) ,7) ) ,4,6) ,4) ,7) ) ,12) )
random seed used was 165315921

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