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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After 20 generations the expression "X" became this:
(((transpose(((step(transpose(echo((echo(transpose(((arpeggio((X+X) ) +transpose((transpose(X,4) |X) ,4) ) +transpose((((X|X) +transpose((X+X) ,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ,4) ,4,6) +transpose((((((X|X) +transpose((X|X) ,12) ) +transpose(transpose(echo((X|X) ,4,6) ,-5) ,7) ) +transpose((echo((echo(transpose(X,-5) ,4,6) +transpose(transpose((X|X) ,-7) ,12) ) ,4,6) |step(transpose((echo(X,4,6) +(transpose(X,-5) +transpose(((X+X) +transpose(X,4) ) ,7) ) ) ,-5) ,12) ) ,4) ) +transpose((((step((X+X) ,12) |X) |(transpose(X,4) +echo(X,4,6) ) ) +((transpose(step((X+X) ,12) ,-7) +(arpeggio(X) +transpose((X|X) ,7) ) ) |echo(X,4,6) ) ) ,7) ) ,7) ) ,4,6) ,4) ,12) +transpose((transpose((shuffle(step((arpeggio((X|X) ) +transpose(step(X,12) ,12) ) ,12) ) +transpose(((X+transpose(((X+X) +transpose(X,7) ) ,7) ) +transpose(transpose(((X|(X+X) ) +transpose(arpeggio(X) ,7) ) ,-7) ,12) ) ,7) ) ,-7) |echo(shuffle((arpeggio(((transpose(arpeggio(X) ,-5) |echo(arpeggio(X) ,4,6) ) |step((transpose(X,4) +step(X,12) ) ,12) ) ) +transpose(transpose(X,4) ,7) ) ) ,4,6) ) ,12) ) +transpose((arpeggio((transpose(transpose(transpose((transpose((((X+transpose((X|X) ,4) ) +transpose(echo(X,4,6) ,7) ) |(transpose(X,4) +X) ) ,4) +((X+transpose(transpose(X,-5) ,7) ) +arpeggio(transpose((X+transpose(X,7) ) ,-5) ) ) ) ,4) ,-5) ,4) +transpose(transpose(transpose(step(transpose(transpose((transpose(X,-7) |transpose((X|X) ,4) ) ,-7) ,4) ,12) ,-7) ,-5) ,12) ) ) +echo(transpose(transpose(transpose(((transpose((((transpose(transpose(X,-7) ,-7) +transpose(transpose(((transpose(X,-5) +transpose(X,4) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,-5) ) ,-5) ,7) ) +transpose(echo((transpose(transpose(X,-5) ,-5) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ) ,4,6) ,4) ) +transpose((((((((X+X) +transpose(arpeggio(X) ,4) ) +transpose((X+X) ,7) ) +transpose(echo(arpeggio(X) ,4,6) ,4) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,7) ) +transpose(transpose((X+X) ,-7) ,7) ) +((transpose(X,4) +transpose(arpeggio(X) ,7) ) |(((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) ) ) ,7) ) ,-7) |(arpeggio(arpeggio(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(transpose(X,-7) ,7) ) +transpose(transpose(transpose(transpose(X,4) ,-7) ,-7) ,7) ) ) ) |transpose(((transpose(echo(X,4,6) ,4) +transpose(step(transpose(transpose(echo(step(X,12) ,4,6) ,-5) ,4) ,12) ,4) ) +transpose(step((((transpose(X,4) +transpose(X,7) ) +((transpose(X,-5) +(X+X) ) +transpose(X,7) ) ) +transpose(echo(X,4,6) ,12) ) ,12) ,7) ) ,-7) ) ) |(((shuffle(transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |(X+X) ) +transpose((transpose(X,4) +transpose(transpose(X,4) ,7) ) ,12) ) ,4) ,4) ) +transpose((transpose((X|(transpose(X,-5) +(X+transpose(X,7) ) ) ) ,-5) +transpose(echo((X|((shuffle(X) +transpose(X,12) ) |(X+X) ) ) ,4,6) ,12) ) ,4) ) +transpose((transpose(echo(arpeggio((X+X) ) ,4,6) ,-7) +transpose((transpose(shuffle((X|transpose(X,-5) ) ) ,-5) +transpose(transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,4) ,7) ) ,12) ) ,7) ) +transpose(arpeggio(step(((transpose(transpose(transpose(X,-7) ,4) ,-7) +transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ,4) ) +transpose((step((X+step(X,12) ) ,12) +transpose((transpose(X,-5) +transpose(X,12) ) ,4) ) ,7) ) ,12) ) ,12) ) ) ,-7) ,4) ,4) ,4,6) ) ,7) ) ,-5) +transpose((((transpose((transpose(shuffle((((((X+X) +transpose(step(X,12) ,7) ) +transpose(transpose((X|X) ,4) ,12) ) +transpose(transpose(transpose(X,-7) ,-5) ,12) ) |(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-5) +(echo(X,4,6) |transpose(transpose(X,4) ,-7) ) ) ) ) ,-5) |transpose(transpose(((transpose(transpose(((X+X) +X) ,4) ,4) +transpose((transpose(transpose(transpose(X,4) ,4) ,4) |(arpeggio(X) +transpose(((X|X) +(X|X) ) ,12) ) ) ,4) ) +transpose(transpose(((step(X,12) |X) |arpeggio((X|transpose(X,4) ) ) ) ,-5) ,7) ) ,-7) ,-7) ) ,-5) +(((transpose(echo(transpose((X|X) ,-5) ,4,6) ,4) |transpose(transpose(transpose(transpose(step(transpose(shuffle(X) ,-5) ,12) ,4) ,-7) ,-5) ,-7) ) +transpose(transpose(((((transpose((shuffle(transpose(transpose(transpose(X,4) ,-5) ,-5) ) |(transpose(X,4) +(X|X) ) ) ,-5) +(transpose(transpose(arpeggio(transpose(X,-7) ) ,-5) ,4) |step(step(arpeggio(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,12) ,12) ) ) +transpose((echo((echo(((transpose(X,-7) +transpose(X,12) ) +step((X+(X+X) ) ,12) ) ,4,6) |(((((X+transpose(X,12) ) |shuffle(X) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose((arpeggio(echo(X,4,6) ) +arpeggio(X) ) ,12) ) ) ,4,6) +transpose(((arpeggio((X+X) ) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ) +transpose((transpose((transpose(transpose(transpose(X,-7) ,-5) ,-7) +transpose(((X+transpose(X,12) ) |X) ,7) ) ,-5) +transpose(((transpose(transpose(X,-7) ,-5) +transpose(((((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose((X+X) ,7) ) |X) +transpose(X,12) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ,12) ) ,7) ) ,12) ) ,-7) ) +((((transpose((X+transpose(transpose(X,-5) ,7) ) ,-5) +transpose(transpose((echo(X,4,6) |transpose(X,-7) ) ,-5) ,12) ) +transpose(transpose(transpose(transpose(transpose(X,-7) ,-7) ,-7) ,4) ,12) ) |shuffle((transpose((transpose((X|X) ,-7) |(transpose(X,-5) +(X+transpose(X,12) ) ) ) ,-7) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) ,-7) ) ) ) |(echo(((step(X,12) +X) |transpose(X,-7) ) ,4,6) +transpose(echo(echo(arpeggio(((X|X) +transpose(step(X,12) ,12) ) ) ,4,6) ,4,6) ,7) ) ) ) +transpose((echo(X,4,6) |(((X|transpose(X,4) ) +transpose(step(transpose(X,-5) ,12) ,4) ) +transpose(((X+X) |X) ,7) ) ) ,4) ) ,-7) ,4) ) +transpose(((((shuffle(((((X+(X+transpose(X,12) ) ) |(arpeggio(((X+transpose(transpose(X,-7) ,4) ) +transpose(step(X,12) ,7) ) ) |(X+(X|echo(X,4,6) ) ) ) ) +transpose(arpeggio(transpose((transpose(X,4) |(X+shuffle(X) ) ) ,-7) ) ,4) ) +transpose(((transpose(shuffle(X) ,4) +transpose((step(X,12) +transpose(echo(X,4,6) ,12) ) ,12) ) +transpose((((transpose((X+transpose(X,12) ) ,-5) +transpose(step((X+transpose(X,7) ) ,12) ,12) ) +transpose(arpeggio(arpeggio(X) ) ,12) ) +transpose(echo(transpose((X+X) ,4) ,4,6) ,4) ) ,7) ) ,7) ) ) +transpose(shuffle((transpose(transpose(X,4) ,-7) +transpose(transpose(transpose((echo(transpose((X+transpose(X,12) ) ,4) ,4,6) +transpose((step(X,12) +transpose(X,-7) ) ,12) ) ,-7) ,-7) ,7) ) ) ,4) ) +transpose(transpose(echo(step((transpose(transpose(((X+X) |transpose(X,4) ) ,-7) ,-7) +transpose(((X|X) +transpose((transpose(X,-5) +(X+X) ) ,7) ) ,12) ) ,12) ,4,6) ,4) ,7) ) +((arpeggio(echo(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,12) ) ) ,4,6) ) +arpeggio(transpose(((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(transpose(X,4) ,4) ,12) ) |shuffle(X) ) ,4) ) ) +transpose(((transpose((transpose(transpose(((X|X) +transpose(X,12) ) ,4) ,-5) +transpose((((X+X) +transpose(shuffle(X) ,12) ) +(step(X,12) +transpose((echo(X,4,6) |transpose(X,-7) ) ,7) ) ) ,7) ) ,4) |echo(transpose(X,4) ,4,6) ) |echo((shuffle((X+X) ) +transpose(shuffle(X) ,12) ) ,4,6) ) ,7) ) ) +transpose(step((transpose(transpose(((transpose(shuffle(transpose(X,-5) ) ,-5) |transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,-5) ,12) ) |transpose(((X+transpose(X,12) ) +X) ,-5) ) ,4) ) +transpose(step(transpose(((X+transpose((X+transpose(step(X,12) ,12) ) ,12) ) +transpose(transpose((X+transpose((X|X) ,12) ) ,-5) ,7) ) ,4) ,12) ,7) ) ,-7) ,4) +transpose((transpose(arpeggio((transpose(((step(X,12) +transpose((((X+X) +transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,-5) |((X+echo(X,4,6) ) |(X|X) ) ) ) ,-5) +transpose(transpose((((X+transpose(X,12) ) |X) |transpose((X+X) ,-5) ) ,4) ,4) ) ,-7) ) ,12) ,12) ) ,7) ) ) +((transpose(((transpose(arpeggio((transpose(X,4) |transpose(X,-5) ) ) ,-7) |transpose(transpose(((X+X) |X) ,4) ,-5) ) +transpose(transpose(((((X+transpose(transpose(X,-5) ,7) ) +(X+transpose(X,7) ) ) +(transpose((X|X) ,4) +echo(step(X,12) ,4,6) ) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,4) ) ,-5) ,7) ) ,-5) |transpose(((arpeggio(((arpeggio((transpose(X,4) +transpose((X|X) ,7) ) ) +transpose(echo(shuffle(X) ,4,6) ,4) ) +transpose((transpose(arpeggio(X) ,-5) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ) +transpose(step((transpose(X,-7) +X) ,12) ,4) ) +transpose((transpose(X,-7) |transpose((((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,12) ) |((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ) ,-7) ) ,7) ) ,-5) ) +transpose((transpose(arpeggio((((transpose((arpeggio(X) +transpose((transpose(X,-5) +transpose(transpose(X,-7) ,12) ) ,12) ) ,-5) |transpose((arpeggio(step(X,12) ) +transpose(((X+transpose(((X+X) |arpeggio(X) ) ,12) ) |(X|shuffle(X) ) ) ,-7) ) ,4) ) +transpose(((shuffle(transpose(step(transpose(step(transpose(X,-7) ,12) ,4) ,12) ,-5) ) +transpose(arpeggio(echo(transpose(step(X,12) ,4) ,4,6) ) ,4) ) +transpose((transpose(((((shuffle(X) +(X+transpose((X+X) ,12) ) ) +transpose(((transpose(X,-5) +transpose(shuffle((X|X) ) ,4) ) +transpose(step(step(X,12) ,12) ,7) ) ,4) ) +transpose(step(transpose(X,-5) ,12) ,7) ) +transpose(step(transpose(((X+transpose(X,7) ) +step(X,12) ) ,-7) ,12) ,7) ) ,-5) +(transpose(shuffle(X) ,4) |transpose(((X+transpose(transpose(((X+X) +transpose(X,7) ) ,4) ,12) ) |transpose(transpose(X,-7) ,-7) ) ,-5) ) ) ,7) ) ,4) ) +transpose(arpeggio(arpeggio(transpose((transpose(X,-5) +transpose(step(X,12) ,12) ) ,-5) ) ) ,7) ) ) ,-5) +(arpeggio((transpose(shuffle(step(transpose((X+X) ,-7) ,12) ) ,-5) +transpose(((((arpeggio(X) +transpose(X,-5) ) +transpose(((X+transpose(X,12) ) +transpose((X+X) ,7) ) ,4) ) +transpose(transpose(arpeggio(X) ,4) ,7) ) +transpose(X,12) ) ,-5) ) ) +transpose(transpose(transpose(step((X+X) ,12) ,4) ,-7) ,12) ) ) ,7) ) ) +transpose((((arpeggio(transpose((transpose((transpose((transpose(step((X+transpose(X,7) ) ,12) ,4) +transpose(((X+X) +transpose(arpeggio(X) ,12) ) ,-5) ) ,-5) +transpose(echo((((X|transpose(X,4) ) +transpose(transpose(((X+transpose(X,7) ) |X) ,-5) ,4) ) +transpose(transpose(X,4) ,7) ) ,4,6) ,4) ) ,-7) +transpose(((transpose(transpose(((step(echo(X,4,6) ,12) +transpose((transpose((X+transpose(X,7) ) ,4) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ,12) ) +((transpose(arpeggio((X+transpose(X,12) ) ) ,4) +transpose((transpose(X,4) |(X+transpose((X|X) ,12) ) ) ,4) ) +transpose(((transpose(X,-5) |(X+X) ) +arpeggio(X) ) ,7) ) ) ,-5) ,4) +transpose(step(transpose((transpose(shuffle(X) ,4) |transpose(X,-7) ) ,-5) ,12) ,4) ) +transpose(echo(((step(transpose(X,-5) ,12) |(((step(X,12) +X) |transpose(X,4) ) |(X+X) ) ) +transpose(((((((step(X,12) |transpose(X,-5) ) |(shuffle(X) +transpose(X,-5) ) ) +transpose(transpose(((transpose(X,-7) +transpose((X|X) ,7) ) +transpose(X,4) ) ,-7) ,4) ) +transpose(shuffle((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) |transpose(X,4) ) ) ,7) ) +transpose(((((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) |(transpose(X,-7) |echo(X,4,6) ) ) ,4) ) +transpose(transpose((X+X) ,4) ,7) ) ,12) ) ,4,6) ,7) ) ,12) ) ,4) ) |(echo(transpose((((((step(arpeggio(X) ,12) |X) +transpose(transpose(echo(X,4,6) ,4) ,7) ) +transpose(shuffle(X) ,4) ) +transpose(((transpose((transpose(X,4) +transpose(transpose(X,4) ,7) ) ,-7) +transpose(transpose(X,-7) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) +transpose(transpose((X+(X+transpose(transpose(X,-7) ,12) ) ) ,-5) ,-7) ) ,-7) ,4,6) |(((shuffle(arpeggio(transpose(transpose(transpose(X,-5) ,-5) ,-5) ) ) |echo(((arpeggio(((arpeggio(X) |echo(X,4,6) ) +transpose(transpose(X,4) ,12) ) ) +(transpose(X,4) +transpose(((X|X) |X) ,7) ) ) +transpose((echo(X,4,6) +transpose(transpose(((transpose(X,4) |arpeggio((X+X) ) ) |arpeggio(echo(X,4,6) ) ) ,4) ,12) ) ,12) ) ,4,6) ) +transpose(((echo(((transpose(transpose(transpose(X,4) ,4) ,-5) +transpose((transpose(transpose(X,4) ,4) +transpose((X+X) ,-5) ) ,4) ) +transpose(transpose((X|X) ,-5) ,7) ) ,4,6) +transpose(echo(transpose((((step(X,12) |X) +transpose(arpeggio(X) ,4) ) +transpose((transpose(X,-7) +transpose(X,7) ) ,7) ) ,-7) ,4,6) ,7) ) +transpose(transpose(((shuffle(transpose(X,-5) ) +shuffle(X) ) +transpose(shuffle(echo(((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) ,4,6) ) ,7) ) ,-5) ,12) ) ,4) ) +transpose(((((((X+transpose(X,7) ) +(X+transpose(X,12) ) ) +transpose(((step((X+transpose(X,7) ) ,12) +transpose((X+transpose(X,12) ) ,4) ) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) ,-5) ) +step(((echo((X|X) ,4,6) +transpose(echo(((X+X) |(X+transpose(X,12) ) ) ,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) ,12) ) +transpose(transpose(step((((transpose(X,4) +X) |transpose(arpeggio(X) ,-7) ) |((X+transpose((step(X,12) +transpose(transpose((X+transpose(X,7) ) ,-7) ,12) ) ,12) ) |transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,4) ) ) ,12) ,-5) ,7) ) |((arpeggio(transpose(X,-7) ) +transpose(echo(transpose(shuffle(X) ,4) ,4,6) ,4) ) +transpose(((transpose(transpose(X,4) ,-5) +transpose(arpeggio(transpose(transpose(X,4) ,-5) ) ,4) ) +transpose(((transpose((transpose(X,4) +X) ,4) +transpose(((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ) +transpose((X+X) ,7) ) ,7) ) ,7) ) ) ,7) ) ) ) +transpose((((step(((transpose(transpose((transpose(X,-7) +transpose(transpose((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-5) ,7) ) ,-7) ,-7) |((transpose((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-5) +shuffle(arpeggio(transpose(transpose(X,-5) ,4) ) ) ) ,-5) +transpose(((transpose(((X|X) +transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,12) ) ,-7) +transpose(((transpose((X|X) ,-7) +((X|X) +transpose((echo(X,4,6) |X) ,12) ) ) +transpose(step(transpose(step(X,12) ,4) ,12) ,12) ) ,4) ) +transpose(((transpose(X,-5) |echo((X+X) ,4,6) ) +(X+X) ) ,7) ) ,7) ) |(step(transpose((transpose(echo(X,4,6) ,-7) +transpose(X,12) ) ,-5) ,12) +transpose(transpose((((echo(X,4,6) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+X) ,7) ) |(((X+X) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,4) ,-5) ) ) ) +arpeggio(((transpose(X,4) +transpose(arpeggio(transpose(X,-5) ) ,7) ) +((arpeggio(((echo(X,4,6) |transpose(X,-5) ) +transpose(transpose(transpose(X,-5) ,4) ,12) ) ) +((transpose((transpose(transpose(X,4) ,4) +step(X,12) ) ,4) +transpose(transpose(((X+X) +transpose(echo(X,4,6) ,12) ) ,-7) ,4) ) +transpose((((X+transpose(X,4) ) +transpose((X|X) ,7) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4) ,7) ) ,7) ) ) |((shuffle((X+transpose(X,7) ) ) |((X+transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-5) ,7) ) ) +shuffle((X+transpose(transpose(X,-5) ,12) ) ) ) ) ) ) ) ,12) +(((transpose(arpeggio((step((X+transpose(X,7) ) ,12) |(X|X) ) ) ,-7) +(transpose((transpose(((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) |shuffle(X) ) ,-5) +transpose(echo((transpose((X|X) ,-5) +transpose((transpose(X,-7) +transpose(transpose(X,4) ,12) ) ,12) ) ,4,6) ,12) ) ) +transpose(transpose((shuffle(transpose(transpose(transpose(X,-7) ,-7) ,-5) ) |transpose(echo(transpose(X,-7) ,4,6) ,4) ) ,-7) ,12) ) +shuffle(transpose((arpeggio(step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) ,12) ) +transpose(echo(transpose((((X+transpose((X+X) ,12) ) |X) +transpose((X|step(X,12) ) ,12) ) ,-7) ,4,6) ,12) ) ,-5) ) ) ) +transpose(((transpose(step(transpose(echo(((X+transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,4) ) +transpose(((X+X) +X) ,7) ) ,4,6) ,-7) ,12) ,4) +transpose((((echo(X,4,6) +transpose(transpose(transpose(X,-7) ,4) ,4) ) +transpose(transpose(arpeggio(transpose(transpose(X,4) ,-7) ) ,-5) ,7) ) |transpose(step((((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) +transpose((X+transpose(transpose(X,-5) ,12) ) ,7) ) ,12) ,-7) ) ,12) ) +transpose(echo(transpose((transpose(transpose(transpose(shuffle(X) ,-7) ,-7) ,4) +transpose(echo(transpose(arpeggio(X) ,-5) ,4,6) ,-5) ) ,4) ,4,6) ,7) ) ,4) ) +transpose(arpeggio(transpose(((transpose((((shuffle(shuffle(X) ) +((transpose(X,4) |(X+transpose(X,12) ) ) +transpose((X+transpose(X,12) ) ,-7) ) ) +transpose(((echo(X,4,6) |((X+transpose(X,12) ) +transpose((X+X) ,12) ) ) |step((transpose(X,-5) |(X|X) ) ,12) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) ,-7) +(echo((echo(X,4,6) +((X+transpose(X,12) ) +X) ) ,4,6) |step(((echo(X,4,6) +transpose(X,4) ) +transpose((X+X) ,7) ) ,12) ) ) +transpose((((transpose(echo(transpose(transpose((X+X) ,-5) ,-7) ,4,6) ,-5) +transpose(((step(((step(X,12) |X) +transpose(echo(X,4,6) ,7) ) ,12) +transpose(transpose(step((X|X) ,12) ,4) ,4) ) |step(transpose(((X+X) +(X+X) ) ,4) ,12) ) ,4) ) +transpose(transpose((transpose((X+X) ,4) +transpose(X,4) ) ,4) ,7) ) |arpeggio(((transpose((X|X) ,4) +transpose(transpose(arpeggio(X) ,-5) ,7) ) +transpose(((transpose(X,4) +transpose(transpose(X,4) ,12) ) +transpose((transpose(X,-5) +echo(transpose(X,-7) ,4,6) ) ,12) ) ,7) ) ) ) ,7) ) ,-7) ) ,7) ) ,7) ) +transpose(transpose(((((shuffle(arpeggio(((((X+transpose((X+step(transpose(X,-5) ,12) ) ,4) ) +transpose((X+transpose(shuffle(X) ,12) ) ,7) ) +arpeggio((X+transpose(step(X,12) ,7) ) ) ) +transpose((transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) +transpose(transpose(shuffle(transpose((X|X) ,-7) ) ,-7) ,12) ) ,7) ) ) ) +(shuffle((arpeggio(echo((((transpose(X,4) +X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ,4,6) ) +transpose((transpose(transpose(((X|X) +transpose(arpeggio(X) ,12) ) ,-5) ,-7) |(transpose(X,4) +transpose(X,7) ) ) ,12) ) ) +transpose(transpose(shuffle((step(arpeggio((X+X) ) ,12) +transpose(step(step(shuffle((X|X) ) ,12) ,12) ,7) ) ) ,-5) ,7) ) ) +transpose((shuffle((transpose(echo(transpose(transpose(X,4) ,-7) ,4,6) ,4) +transpose((transpose(((((echo(X,4,6) +X) +transpose((((X+transpose(X,7) ) +(X+transpose(X,7) ) ) +transpose((transpose(X,4) +X) ,7) ) ,7) ) +transpose(shuffle(transpose(X,4) ) ,4) ) +transpose(shuffle(transpose(((X+transpose(X,12) ) +transpose(echo(X,4,6) ,7) ) ,-7) ) ,7) ) ,-7) +transpose(X,7) ) ,7) ) ) |(((X+transpose(transpose(echo((arpeggio(transpose(X,-5) ) +transpose((X|X) ,7) ) ,4,6) ,-5) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) |(((echo(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4,6) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) +transpose((transpose(arpeggio(X) ,-7) +transpose(shuffle((X|shuffle(X) ) ) ,12) ) ,7) ) ) ) ,4) ) +transpose(((transpose(step(((transpose((transpose(transpose(X,4) ,4) +transpose(transpose(transpose(X,4) ,-7) ,12) ) ,-5) +transpose(transpose(transpose(transpose(X,-7) ,4) ,-7) ,4) ) +transpose(echo(transpose(shuffle(X) ,-5) ,4,6) ,7) ) ,12) ,4) +((echo((((arpeggio(X) +transpose((X+transpose(X,7) ) ,7) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) +transpose((transpose(X,-7) +X) ,-5) ) ,4,6) +((echo((X+transpose((X|X) ,4) ) ,4,6) +transpose(echo(transpose((step(X,12) |(X+X) ) ,-7) ,4,6) ,4) ) +transpose(transpose((transpose(X,4) |X) ,4) ,7) ) ) +transpose(transpose(transpose(transpose(X,4) ,-5) ,-7) ,12) ) ) +transpose((transpose(echo(transpose(X,4) ,4,6) ,4) +((transpose(((transpose(transpose((X|X) ,-5) ,4) +transpose(transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ,7) ) +((transpose(step((X+transpose(X,12) ) ,12) ,4) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +shuffle(X) ) ,7) ) ) ,-5) +transpose(((X+transpose(X,7) ) +X) ,4) ) +transpose((transpose(((X+(X|X) ) +transpose(echo(X,4,6) ,12) ) ,-5) +((X|X) +transpose(echo(shuffle(X) ,4,6) ,12) ) ) ,7) ) ) ,4) ) ,7) ) |transpose(((transpose((transpose((transpose((X+transpose(X,12) ) ,-5) +transpose((X+X) ,7) ) ,-7) |((shuffle(step((X+transpose(X,7) ) ,12) ) +transpose(transpose(shuffle(X) ,4) ,12) ) +(transpose(X,-7) +transpose(step(X,12) ,7) ) ) ) ,4) +transpose((shuffle(transpose(X,-7) ) +transpose((X+transpose(X,-5) ) ,12) ) ,12) ) +((transpose(echo((X|(echo(X,4,6) +X) ) ,4,6) ,4) |(((transpose(transpose(step(transpose(echo(X,4,6) ,-7) ,12) ,-7) ,-7) +transpose(((echo((X|X) ,4,6) +(shuffle(X) |transpose(X,-5) ) ) +transpose(transpose(X,-7) ,-5) ) ,12) ) +transpose((echo(echo(transpose(arpeggio(echo(transpose(X,4) ,4,6) ) ,-7) ,4,6) ,4,6) +step(shuffle(((X+transpose(transpose(X,4) ,12) ) +transpose(transpose((X|X) ,4) ,7) ) ) ,12) ) ,4) ) +transpose(transpose(((transpose((((step(X,12) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) |transpose(X,4) ) ,-7) +transpose((X|X) ,4) ) +transpose(transpose((transpose(step(X,12) ,-5) +transpose(transpose(X,-7) ,12) ) ,4) ,7) ) ,-5) ,7) ) ) +transpose((((((((X+X) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) +transpose((arpeggio((X+transpose(X,12) ) ) +(((X+X) +(X+X) ) +transpose(transpose((X|(X+transpose(X,12) ) ) ,-7) ,12) ) ) ,7) ) |transpose(transpose(transpose((arpeggio(X) |X) ,-5) ,-5) ,-7) ) |(((transpose(X,-5) +transpose((transpose(X,-7) +transpose(step(transpose(X,-5) ,12) ,7) ) ,4) ) +transpose(((X+X) +transpose(transpose((X+X) ,-5) ,12) ) ,7) ) |(((transpose((X+(X|X) ) ,-7) |(transpose((X+X) ,-7) +((X|X) +transpose((X|X) ,7) ) ) ) +transpose(((X+transpose(X,7) ) +(echo(X,4,6) +transpose((X+transpose(X,7) ) ,7) ) ) ,7) ) +step(transpose(transpose(X,-5) ,4) ,12) ) ) ) +transpose((((((X+transpose(((X+transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose(step(step(X,12) ,12) ,7) ) +transpose((((X+transpose(X,12) ) +X) +((X+transpose(X,7) ) +X) ) ,7) ) +transpose(((transpose((transpose(X,-5) +transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,12) ) ,4) +transpose(shuffle(X) ,12) ) +(((transpose(echo(arpeggio(X) ,4,6) ,4) +transpose((((transpose(X,-5) +transpose(X,12) ) +transpose(step(X,12) ,4) ) +transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(echo((step(X,12) |(X+transpose(X,7) ) ) ,4,6) ,7) ) ) ,12) ) |((transpose((X+X) ,4) +transpose(step(transpose(X,-5) ,12) ,12) ) |((((X|X) +transpose((X|X) ,4) ) +transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,7) ) +transpose(X,12) ) ) ) ,7) ) ,7) ) ) ,-7) ) ,4) ,12) ) ,12) ) ,4) ) +transpose(step(transpose((transpose(((transpose(transpose(transpose(X,-7) ,-5) ,-7) +((transpose(step((echo(X,4,6) +transpose(transpose(X,-7) ,12) ) ,12) ,-7) +transpose(((((transpose(X,-5) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X|X) ,7) ) +transpose(arpeggio(arpeggio(X) ) ,12) ) +transpose((step(X,12) +(X+transpose(X,12) ) ) ,12) ) ,4) ) +transpose((X+step(X,12) ) ,7) ) ) +(echo(transpose(X,-5) ,4,6) +(((X|X) +X) |transpose(transpose(echo(X,4,6) ,4) ,4) ) ) ) ,-7) +transpose((transpose((transpose(((arpeggio(transpose((X+X) ,4) ) |transpose(X,4) ) +((echo(X,4,6) |echo(X,4,6) ) +arpeggio((X+transpose((X|X) ,7) ) ) ) ) ,-7) |((transpose((transpose(X,-7) |echo(X,4,6) ) ,4) +echo(transpose(transpose(transpose(X,4) ,-5) ,4) ,4,6) ) |((echo(X,4,6) +transpose(shuffle((X+transpose(X,12) ) ) ,7) ) |transpose((X+transpose(transpose(X,-5) ,7) ) ,-7) ) ) ) ,-5) +transpose((step(arpeggio(((X+echo(X,4,6) ) |echo(transpose(X,-7) ,4,6) ) ) ,12) |(X|(transpose(X,-5) +transpose(transpose(X,4) ,7) ) ) ) ,-5) ) ,7) ) ,-7) ,12) ,7) ) |shuffle(transpose((((((((transpose(echo(step(X,12) ,4,6) ,4) +echo((echo(X,4,6) |transpose(X,-5) ) ,4,6) ) +transpose((((echo((X+transpose(X,12) ) ,4,6) +transpose(X,-5) ) +transpose(shuffle((X+transpose(X,12) ) ) ,4) ) +transpose(arpeggio(transpose((X|X) ,-7) ) ,7) ) ,7) ) |transpose(shuffle(((((X|echo((X+transpose(X,7) ) ,4,6) ) |step(X,12) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ) +transpose((transpose(X,-5) +transpose(echo(X,4,6) ,12) ) ,7) ) ) ,-7) ) +transpose(transpose(transpose(step((((X+transpose(X,12) ) +transpose(X,12) ) +transpose(X,-5) ) ,12) ,4) ,-5) ,4) ) +transpose((transpose(shuffle((arpeggio(transpose(arpeggio(X) ,-5) ) +transpose(transpose(transpose(step(step(X,12) ,12) ,4) ,-7) ,12) ) ) ,4) +transpose((((arpeggio(transpose(X,-5) ) |transpose((echo(transpose(X,-5) ,4,6) +transpose(X,7) ) ,4) ) +transpose(transpose(transpose(step((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,4) ,7) ) ,12) ,-7) ,4) ,4) ) +transpose((transpose(step(shuffle(transpose(shuffle((X+transpose(X,12) ) ) ,4) ) ,12) ,-7) +transpose(arpeggio(transpose(transpose(step(transpose(X,-5) ,12) ,-5) ,-7) ) ,12) ) ,7) ) ,7) ) ,7) ) +transpose((transpose((transpose(transpose((transpose(X,-7) +X) ,-7) ,4) +transpose((((X|X) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X|X) ) ,4) ) +transpose(transpose((echo(transpose(X,-5) ,4,6) |((transpose(X,-7) +transpose(X,4) ) +transpose(X,7) ) ) ,-5) ,7) ) ,12) ) ,-5) +transpose(transpose(((echo((((transpose(X,-7) +transpose((X+transpose(X,12) ) ,7) ) +transpose(X,12) ) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,12) ) ,4,6) +transpose(transpose((shuffle((X+transpose(step(X,12) ,12) ) ) +((transpose((X|X) ,-7) +transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(transpose(X,-7) ,12) ) ,7) ) ) ,4) ,12) ) |((transpose(echo((transpose(transpose(X,-7) ,-7) +transpose((transpose(X,-5) +transpose(X,-7) ) ,12) ) ,4,6) ,4) +transpose(((arpeggio(shuffle(transpose((X|X) ,4) ) ) +transpose(((X+X) +transpose((X+transpose(X,12) ) ,12) ) ,12) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(shuffle((transpose(X,4) +transpose(X,12) ) ) ) ,7) ) ,7) ) ,4) ) +transpose((((X+X) |(X+transpose(transpose(X,-7) ,7) ) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ,7) ) ) ,-5) ,7) ) ,7) ) +transpose(transpose(echo((transpose(transpose(transpose(shuffle(transpose(shuffle(echo(X,4,6) ) ,4) ) ,-7) ,4) ,4) +(transpose(((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) |transpose(shuffle(transpose(arpeggio(transpose(X,4) ) ,4) ) ,4) ) ,-5) +transpose(transpose((transpose(X,4) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ,-7) ,12) ) ) ,4,6) ,4) ,7) ) ,-7) ) )
random seed used was 126738425

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