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:
(((((shuffle(((((transpose(step((X+transpose(X,12) ) ,12) ,-7) +arpeggio(transpose(transpose(transpose((X+transpose(X,7) ) ,4) ,4) ,-7) ) ) |transpose(transpose((arpeggio(X) |transpose(X,4) ) ,4) ,4) ) +transpose(((echo(transpose(X,-7) ,4,6) +transpose((transpose(transpose(X,-7) ,4) +transpose(shuffle(step(X,12) ) ,7) ) ,7) ) +transpose(arpeggio(((X|X) |transpose(X,-5) ) ) ,4) ) ,4) ) +transpose(((X+transpose(transpose(((step(X,12) +transpose((X|X) ,12) ) +(X+X) ) ,-5) ,4) ) +transpose(transpose(shuffle(((X+transpose(X,7) ) +transpose((X+X) ,7) ) ) ,-5) ,7) ) ,7) ) ) |transpose(arpeggio((((arpeggio(step(shuffle(X) ,12) ) +transpose(((X|X) +transpose(X,7) ) ,-5) ) +((transpose((X+X) ,-5) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4) ) +transpose(((transpose(echo((X|X) ,4,6) ,-7) +transpose(shuffle(X) ,4) ) +transpose((arpeggio(X) +transpose(transpose((X+transpose(X,12) ) ,4) ,7) ) ,7) ) ,7) ) ) +transpose((shuffle(transpose((transpose((X+X) ,4) +transpose(step(X,12) ,4) ) ,-7) ) |(((((((X|X) +transpose((X+transpose(X,12) ) ,7) ) +transpose((X|transpose(X,-7) ) ,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) +transpose((transpose(X,4) |transpose(transpose(X,4) ,-5) ) ,7) ) +transpose((step(X,12) +X) ,12) ) ) ,7) ) ) ,4) ) +(echo(transpose(arpeggio(transpose((((X+transpose(transpose(X,-5) ,7) ) +transpose(X,12) ) |step((((X+transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,12) ) ,-5) ) ,-7) ,4,6) +transpose((((((arpeggio(echo((((transpose(X,-7) +transpose((((X|X) +transpose((X|X) ,12) ) +transpose(shuffle(transpose(X,-5) ) ,12) ) ,12) ) +transpose((X+transpose(transpose(transpose((X|X) ,-5) ,-7) ,12) ) ,4) ) +transpose(transpose(shuffle(transpose(X,-5) ) ,-7) ,7) ) ,4,6) ) +transpose(transpose((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +X) ,4) ,4) ) +transpose(transpose(transpose(shuffle(step(transpose(X,-7) ,12) ) ,-7) ,4) ,4) ) +transpose(transpose((((((transpose((X|transpose(X,-7) ) ,-5) +transpose((transpose(X,-5) |X) ,12) ) +transpose((step(transpose(X,4) ,12) +transpose((X+transpose(X,12) ) ,-5) ) ,4) ) +transpose((((step(X,12) +transpose(transpose(X,-5) ,7) ) +transpose(step(X,12) ,7) ) +transpose(((X|transpose(X,4) ) +transpose((transpose(X,4) +transpose(X,12) ) ,7) ) ,12) ) ,7) ) +shuffle(transpose(transpose(transpose(shuffle(X) ,4) ,4) ,-7) ) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) ,4) ,7) ) +transpose(arpeggio(shuffle(transpose(transpose(transpose((X+echo(X,4,6) ) ,-7) ,-7) ,-5) ) ) ,-5) ) +((echo(step(step(transpose(X,-5) ,12) ,12) ,4,6) +step((arpeggio(transpose(X,-7) ) +transpose(step(((transpose(X,-7) +transpose((((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4) ) +transpose(step((X+X) ,12) ,7) ) ,12) ,7) ) ,12) ) |(transpose(X,4) +transpose(((transpose(transpose((X|X) ,-7) ,-5) +transpose(arpeggio(transpose(transpose(shuffle(X) ,-5) ,-7) ) ,4) ) +transpose((transpose(X,-7) |(X+transpose(X,7) ) ) ,7) ) ,7) ) ) ) ,7) ) ) +(echo(transpose((echo((shuffle(step(shuffle(shuffle(X) ) ,12) ) +transpose(((transpose(transpose(X,-5) ,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) |shuffle((shuffle(X) +transpose(X,12) ) ) ) ,7) ) ,4,6) +transpose(((transpose(shuffle(X) ,-5) |(step(X,12) |step(X,12) ) ) +transpose(transpose(X,4) ,7) ) ,12) ) ,-7) ,4,6) +(((shuffle(transpose(step(echo((X|X) ,4,6) ,12) ,-5) ) +step(echo(step(transpose(transpose(X,4) ,4) ,12) ,4,6) ,12) ) +transpose(echo(transpose(transpose(transpose((((X|X) +transpose(X,7) ) +transpose(X,7) ) ,4) ,-7) ,4) ,4,6) ,7) ) +transpose((((((X+transpose(X,12) ) +((X+transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose(transpose(echo((X+transpose(X,12) ) ,4,6) ,-5) ,12) ) |step(transpose(transpose(X,-5) ,-5) ,12) ) +transpose((transpose(transpose(((X|X) +(X+transpose(X,7) ) ) ,-5) ,-5) +transpose(shuffle((arpeggio(echo(X,4,6) ) |transpose(X,-7) ) ) ,12) ) ,-7) ) ,12) ) ) ) |(shuffle(((transpose(((((((transpose(transpose(transpose(X,-5) ,-5) ,-7) +transpose(((transpose(step(transpose(X,4) ,12) ,-5) +(shuffle(X) +transpose(shuffle((X|X) ) ,12) ) ) +transpose(transpose((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,-5) +transpose((transpose((X|X) ,4) +transpose((X|X) ,12) ) ,12) ) ,4) ,7) ) ,4) ) +transpose((transpose(transpose((X|X) ,-5) ,4) +transpose(((((X+X) |step(X,12) ) +transpose((X+transpose(transpose(X,-7) ,4) ) ,12) ) +((step(((transpose(X,4) |shuffle(X) ) +transpose((X|X) ,7) ) ,12) +transpose(transpose(transpose(X,-5) ,-7) ,4) ) +transpose(step((X+X) ,12) ,7) ) ) ,12) ) ,7) ) +transpose(arpeggio(transpose((transpose((transpose(X,4) +transpose(transpose(X,4) ,-7) ) ,4) +((X+(X|((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose(((X|X) |X) ,12) ) ) ,4) ) ,12) ) |transpose(transpose(arpeggio(shuffle(arpeggio(((X+transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ) ) ,-5) ,4) ) |(transpose(transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +(transpose(transpose(transpose(X,4) ,4) ,-5) +transpose(transpose(X,4) ,4) ) ) ,-7) ,4) |((shuffle(transpose((transpose(X,4) |transpose(X,4) ) ,-7) ) |((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose((X|X) ,4) ) ) +transpose((transpose(step((X|(X+transpose(X,12) ) ) ,12) ,4) +((transpose(X,4) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X|arpeggio(X) ) ,7) ) ) ,12) ) ) ) +((transpose(transpose(echo((X|X) ,4,6) ,-7) ,4) +((arpeggio(echo(X,4,6) ) +transpose(echo((step(step((X+transpose(X,12) ) ,12) ,12) +arpeggio((X+X) ) ) ,4,6) ,4) ) +transpose((step(X,12) |(X|((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,7) ) ) +(transpose(echo(echo(X,4,6) ,4,6) ,-7) |(transpose(transpose(arpeggio(echo((X+X) ,4,6) ) ,-7) ,-5) +transpose((((shuffle(X) +echo(X,4,6) ) |(X+transpose((X+transpose(X,12) ) ,12) ) ) +transpose(transpose(transpose(transpose(X,-7) ,-5) ,-7) ,7) ) ,-7) ) ) ) ) ,4) +transpose(((step(((transpose((X|X) ,4) |shuffle(arpeggio(X) ) ) |transpose(((((X+transpose((X+X) ,4) ) +transpose(transpose(X,-5) ,7) ) |transpose(X,4) ) +echo(X,4,6) ) ,-5) ) ,12) +transpose(((transpose(arpeggio(arpeggio(X) ) ,-5) +transpose((X|(echo(X,4,6) |transpose(X,-7) ) ) ,12) ) |(echo(transpose(X,-5) ,4,6) +transpose(step((echo(((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,4,6) +transpose(X,12) ) ,12) ,12) ) ) ,12) ) |transpose((((transpose(X,-7) +transpose((transpose(X,-5) |step(X,12) ) ,7) ) +transpose(X,12) ) |(echo(echo((X+transpose(X,7) ) ,4,6) ,4,6) +transpose((((X+transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) +transpose((((transpose((X|X) ,-7) +transpose(X,4) ) +transpose(shuffle((X+transpose(X,12) ) ) ,7) ) +transpose(shuffle(X) ,12) ) ,7) ) ,7) ) ) ,-5) ) ,4) ) +transpose(step(arpeggio((((((echo(X,4,6) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) ) +transpose(X,-5) ) +transpose(shuffle(transpose(echo((X+transpose(X,7) ) ,4,6) ,4) ) ,4) ) +transpose(transpose((((arpeggio(step(X,12) ) |transpose((X+transpose(X,12) ) ,4) ) +transpose((X+((X+X) |X) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ,7) ) +transpose(transpose((((step(X,12) +transpose((X+X) ,4) ) +transpose(X,7) ) |(step(X,12) +(X|X) ) ) ,-7) ,12) ) ) ,12) ,7) ) ) |((step((((transpose(transpose((transpose(shuffle((((X+transpose(X,12) ) +transpose(arpeggio(echo(X,4,6) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,4) |((transpose((transpose(X,4) +transpose(transpose(X,-7) ,12) ) ,-7) +transpose(transpose(arpeggio(X) ,-7) ,-7) ) +((X+transpose(transpose(shuffle(X) ,-5) ,4) ) +transpose(step(X,12) ,7) ) ) ) ,-7) ,-7) +transpose(transpose((step(transpose(transpose(transpose(X,-5) ,-5) ,-7) ,12) +transpose(transpose((transpose(transpose(((X+X) +transpose((X+(X+X) ) ,12) ) ,4) ,-5) |transpose((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +X) ,4) ) ,-5) ,12) ) ,-5) ,7) ) +step((((transpose(transpose((X+X) ,4) ,-5) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(transpose(((transpose(X,4) +transpose((X|X) ,4) ) +transpose(X,7) ) ,-5) ,7) ) +transpose(((transpose(transpose(((((step(X,12) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(transpose((X+X) ,-5) ,-7) ,4) ) +transpose((X+transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,7) ) ,-5) ,-5) +transpose(step(((echo((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,4) ,7) ) +X) ,4,6) |transpose((X+X) ,4) ) +(transpose(shuffle(transpose(X,4) ) ,-5) +(step(arpeggio(X) ,12) +transpose(transpose(X,4) ,12) ) ) ) ,12) ,4) ) +transpose((transpose((((shuffle((X|transpose(X,-5) ) ) +shuffle(X) ) +transpose(transpose(transpose(((X|X) |(X+transpose(X,12) ) ) ,4) ,-7) ,4) ) +transpose((shuffle(arpeggio(X) ) +(echo(echo(X,4,6) ,4,6) +(transpose(X,4) |shuffle(X) ) ) ) ,7) ) ,-7) +echo(X,4,6) ) ,7) ) ,12) ) ,12) ) |transpose((((X+X) +transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) +transpose(echo(transpose(((X+X) +X) ,-5) ,4,6) ,-7) ) ,-5) ) ,12) +transpose((transpose(((((transpose(((((transpose(X,4) +transpose(X,4) ) +transpose((X+X) ,7) ) +transpose(transpose(transpose(shuffle(transpose(X,4) ) ,-5) ,4) ,4) ) +transpose((shuffle(X) |(X|(X+transpose(X,7) ) ) ) ,7) ) ,4) +shuffle(transpose((((X|((((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((X|X) ,12) ) ) +transpose(transpose((X|X) ,-5) ,4) ) +transpose((transpose(shuffle(X) ,-7) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,7) ) ,7) ) ,-5) ) ) +transpose(transpose(step((echo(X,4,6) +transpose(transpose(X,4) ,-5) ) ,12) ,-7) ,4) ) +transpose(((transpose((X|X) ,-7) +transpose(X,4) ) +transpose(transpose(echo(transpose((X|X) ,-7) ,4,6) ,-5) ,12) ) ,7) ) |transpose(((((arpeggio((transpose(X,-7) +echo(X,4,6) ) ) |transpose((echo(X,4,6) |X) ,-7) ) +transpose((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-5) +transpose(transpose(X,-7) ,-5) ) ,-7) ) +transpose(arpeggio(transpose((((transpose((X|transpose(X,-5) ) ,4) |((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-7) ) |X) ) +transpose(((X|X) +transpose(arpeggio(X) ,12) ) ,4) ) +transpose(arpeggio(step(((X+X) +(X+transpose(X,12) ) ) ,12) ) ,7) ) ,-7) ) ,12) ) +transpose(((((transpose(((X+X) +transpose(transpose(X,-5) ,7) ) ,-5) +arpeggio(echo(transpose(step(X,12) ,-7) ,4,6) ) ) +transpose(step((((transpose(X,4) +transpose((X+transpose(X,12) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose((X+X) ,4) ) ,12) ,7) ) +transpose((((X+transpose(X,-5) ) +transpose(X,4) ) +transpose((transpose(X,-5) +X) ,7) ) ,4) ) |transpose((X+transpose(transpose(X,-7) ,12) ) ,4) ) ,7) ) ,4) ) ,-7) +(transpose(echo((shuffle(shuffle(transpose(((transpose(X,-5) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,-5) ) ) +transpose(echo(((arpeggio((transpose(X,4) |step(X,12) ) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,4) ,7) ) +transpose((((((X+X) +transpose(X,12) ) +transpose(((X|X) +transpose(transpose(X,4) ,12) ) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose(transpose(X,4) ,-7) ) ,7) ) ,4,6) ,12) ) ,4,6) ,-5) +arpeggio(((transpose(((shuffle(transpose((shuffle(echo(X,4,6) ) +transpose(arpeggio(X) ,12) ) ,-5) ) +shuffle(step(transpose(transpose(X,-7) ,-5) ,12) ) ) +(((X|echo(X,4,6) ) |transpose(transpose(X,4) ,-7) ) |(((X+transpose((X+transpose(transpose(X,-5) ,12) ) ,7) ) +transpose(transpose((X|X) ,-7) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,7) ) ) ) ,-5) +transpose(((X+transpose(transpose(echo((X+transpose(X,7) ) ,4,6) ,-5) ,7) ) |(arpeggio((X+transpose(X,12) ) ) |transpose(transpose(transpose((X+transpose(X,7) ) ,4) ,4) ,-5) ) ) ,4) ) +transpose((transpose(transpose(step(transpose(X,-5) ,12) ,-5) ,4) |transpose((((X+transpose(X,12) ) +transpose(echo(X,4,6) ,7) ) |shuffle(step(shuffle(X) ,12) ) ) ,4) ) ,7) ) ) ) ) ,4) ) +transpose(transpose((transpose(transpose(((shuffle((transpose(shuffle(shuffle(X) ) ,-5) |(transpose((echo(X,4,6) |X) ,4) +transpose(echo(transpose(X,-5) ,4,6) ,12) ) ) ) +((echo(X,4,6) +transpose(step(X,12) ,7) ) +transpose(arpeggio((step(transpose(X,4) ,12) +echo(arpeggio(X) ,4,6) ) ) ,7) ) ) +((transpose((transpose((X|X) ,-5) +transpose(((X+X) +transpose(X,12) ) ,12) ) ,-7) +transpose((transpose(X,-5) |(X+transpose((X|transpose(X,4) ) ,7) ) ) ,7) ) +transpose(((transpose(X,-5) +transpose(transpose(((X+transpose((X+transpose(X,-5) ) ,4) ) +transpose((X|(X+transpose(X,7) ) ) ,7) ) ,-7) ,12) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(step(transpose(X,-5) ,12) ,7) ) +transpose(X,-5) ) ,7) ) ,7) ) ) ,-7) ,-5) |transpose(transpose(transpose(transpose(transpose((((transpose(transpose(X,4) ,-5) +transpose((transpose(X,4) |X) ,12) ) +transpose(echo((echo(step(X,12) ,4,6) +transpose(X,4) ) ,4,6) ,7) ) +transpose(transpose(transpose(step(X,12) ,-5) ,-5) ,7) ) ,-5) ,4) ,4) ,4) ,-7) ) ,-7) ,7) ) ) ) +transpose((step(transpose(transpose(shuffle((transpose((((echo(step(X,12) ,4,6) +step(X,12) ) +transpose((arpeggio((transpose(X,-7) +(X+transpose(X,12) ) ) ) +(transpose((transpose(X,-7) +transpose(transpose(X,-7) ,12) ) ,-5) +transpose(shuffle(X) ,-7) ) ) ,12) ) |transpose(((transpose(transpose(X,-7) ,4) +transpose((arpeggio(X) +transpose((X|X) ,12) ) ,4) ) +transpose((step(arpeggio(arpeggio(X) ) ,12) +transpose(step(transpose(X,-5) ,12) ,4) ) ,7) ) ,-5) ) ,-5) |transpose(transpose((((transpose(X,-7) |arpeggio((arpeggio(arpeggio(X) ) |transpose((X+transpose(X,12) ) ,4) ) ) ) +transpose((transpose((X+transpose(arpeggio(step(X,12) ) ,12) ) ,4) +transpose(echo(((X+transpose(X,12) ) +transpose(arpeggio(X) ,12) ) ,4,6) ,7) ) ,7) ) +transpose(transpose((shuffle(((X+transpose(X,7) ) +(X|X) ) ) +transpose(arpeggio(transpose((X+X) ,-5) ) ,12) ) ,-7) ,4) ) ,4) ,-7) ) ) ,-7) ,4) ,12) +(((transpose(((transpose(((((((shuffle(X) +(X+((X|X) +transpose(echo(X,4,6) ,-7) ) ) ) +transpose(((((transpose(X,-5) +transpose((X|arpeggio(X) ) ,4) ) +transpose((X|X) ,7) ) |((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(((X+X) +transpose(X,7) ) ,7) ) ) |step(transpose(((X+X) +transpose(transpose(X,-5) ,7) ) ,-7) ,12) ) ,7) ) +transpose(transpose(echo((shuffle((X|X) ) |((transpose(X,-7) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,4,6) ,4) ,4) ) +transpose(shuffle((transpose((transpose(X,4) +transpose(step(X,12) ,7) ) ,-7) +step(transpose(X,4) ,12) ) ) ,7) ) |(echo((transpose(transpose(transpose(X,-5) ,-7) ,4) +((transpose(X,-5) +transpose(((X+transpose(step(X,12) ,4) ) +transpose(X,7) ) ,4) ) +transpose(((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(transpose(echo(X,4,6) ,-7) ,4) ) +transpose(((X+transpose(X,7) ) |X) ,7) ) ,7) ) ) ,4,6) +transpose((transpose((X|X) ,4) +((X+transpose(transpose(X,-5) ,12) ) |transpose(X,4) ) ) ,-7) ) ) +step(transpose((((step(transpose(transpose(step(X,12) ,-5) ,-5) ,12) +transpose(((transpose(X,-7) +transpose(X,-7) ) +transpose(X,12) ) ,4) ) +transpose(shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,7) ) |step((transpose(((X|(X+transpose(X,7) ) ) |(X+transpose(X,7) ) ) ,4) +step(shuffle(((X+X) +transpose((X+transpose(X,7) ) ,12) ) ) ,12) ) ,12) ) ,4) ,12) ) ,4) +transpose((transpose(transpose(transpose((((transpose(X,4) +transpose(transpose(X,-5) ,12) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(transpose(X,-5) ,4) ,4) ) +transpose(transpose((X|X) ,-5) ,7) ) ,12) ) |((X|step(X,12) ) |echo(((X|X) |X) ,4,6) ) ) ,-7) ,-7) ,4) +transpose(((((echo(transpose(arpeggio(transpose(transpose(X,-5) ,4) ) ,4) ,4,6) |transpose(((step(X,12) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) ,4) ) +transpose((transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) +shuffle(echo(transpose(X,-7) ,4,6) ) ) ,-5) +(((step((X+transpose(X,7) ) ,12) +transpose(shuffle(arpeggio(X) ) ,4) ) +transpose(arpeggio(arpeggio(X) ) ,7) ) +(transpose(X,4) +(transpose((X+transpose(X,12) ) ,-7) |arpeggio(X) ) ) ) ) ,4) ) +transpose((((transpose(transpose(X,4) ,-5) +transpose(transpose(X,4) ,7) ) |step((X+X) ,12) ) |transpose(transpose(transpose(X,-5) ,-7) ,-7) ) ,7) ) +transpose(transpose(((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) |transpose(((X+X) +(X|X) ) ,-7) ) ,-7) ,12) ) ,12) ) ,4) ) +transpose(transpose((echo(X,4,6) |(((transpose((transpose(X,-5) +(X|X) ) ,4) +transpose(transpose((((transpose(X,-5) +transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose((X|X) ,7) ) ,12) ) +transpose(step((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ,12) ) +transpose((((transpose(X,-5) +transpose(X,7) ) +transpose((transpose(X,-5) |(X+transpose(X,7) ) ) ,12) ) +transpose(((arpeggio((X+transpose(X,12) ) ) +transpose(arpeggio((((X|transpose(X,-7) ) +transpose(step(X,12) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,4) ) +transpose((echo(arpeggio(X) ,4,6) |(transpose(X,4) +transpose(echo((X+transpose(X,12) ) ,4,6) ,12) ) ) ,7) ) ,7) ) ,4) ) +transpose(echo(step(transpose(transpose(transpose(X,-7) ,-7) ,4) ,12) ,4,6) ,7) ) ) ,-7) ,7) ) ,-5) +transpose(transpose(transpose(step((transpose(((transpose((((((X+transpose(transpose(X,-7) ,4) ) +transpose((X+X) ,7) ) +transpose(transpose(transpose(X,-5) ,4) ,4) ) +transpose((arpeggio(X) +transpose(echo(X,4,6) ,7) ) ,7) ) +transpose(step(step(transpose(transpose((transpose(X,4) +transpose((X+transpose(X,7) ) ,12) ) ,-7) ,-7) ,12) ,12) ,12) ) ,-5) |(transpose(((arpeggio((X+transpose(X,12) ) ) +transpose((transpose(X,4) +transpose(transpose(X,-5) ,12) ) ,7) ) |((X+transpose(((step(X,12) +transpose(X,4) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) ,4) ) +transpose(transpose(arpeggio(X) ,-5) ,7) ) ) ,4) |arpeggio(((transpose((X|X) ,-7) +transpose((X+transpose(X,7) ) ,12) ) +transpose((transpose(shuffle(transpose(X,-5) ) ,-5) |transpose(transpose(X,4) ,-5) ) ,-5) ) ) ) ) +transpose((((((X|X) +transpose(step(X,12) ,7) ) +transpose((((X|X) +transpose(X,4) ) +transpose(X,7) ) ,12) ) +(((X+transpose(X,4) ) +transpose(X,7) ) +X) ) +transpose(step(transpose(transpose(X,-5) ,-7) ,12) ,-7) ) ,-5) ) ,4) +transpose((((((echo((transpose(step(X,12) ,-5) +transpose(arpeggio(shuffle(X) ) ,12) ) ,4,6) +transpose(shuffle(((shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,7) ) ) |step(X,12) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) ) ,7) ) +transpose(shuffle(echo((echo(echo(transpose(transpose(X,-7) ,-5) ,4,6) ,4,6) |transpose(X,4) ) ,4,6) ) ,4) ) +transpose(transpose((transpose(transpose(X,-5) ,-5) |transpose(transpose(transpose(transpose(transpose(X,-5) ,-5) ,-7) ,-7) ,4) ) ,4) ,7) ) |transpose(shuffle(transpose((X+transpose(X,12) ) ,-7) ) ,4) ) |transpose(((((shuffle((((transpose(X,4) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose((X+X) ,4) ,7) ) ) +transpose((arpeggio(echo(X,4,6) ) +transpose(transpose(transpose(X,4) ,-5) ,12) ) ,7) ) +transpose(transpose((transpose(X,-5) +transpose(transpose(X,-5) ,7) ) ,-5) ,12) ) +transpose((transpose((((transpose(step(X,12) ,4) +(((X+transpose((X+transpose(X,7) ) ,7) ) +transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose((X+X) ,4) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4) |transpose((transpose(transpose(X,-7) ,4) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,-5) ) ,4) ) +transpose((transpose(arpeggio(echo(X,4,6) ) ,4) +(step(transpose(echo(transpose((X|X) ,-5) ,4,6) ,-5) ,12) +transpose(transpose(arpeggio(shuffle(X) ) ,-7) ,7) ) ) ,7) ) ,-5) ) ,12) ) ,12) ,-7) ,-7) ,4) ) +transpose(echo(shuffle(((((arpeggio((((((echo(X,4,6) +transpose(shuffle(arpeggio(X) ) ,4) ) +transpose(transpose(X,-7) ,7) ) |(transpose((X+X) ,-5) +transpose(((X+transpose(X,12) ) +arpeggio(X) ) ,12) ) ) +transpose(((X+transpose(X,12) ) +shuffle(echo(X,4,6) ) ) ,4) ) +transpose(((transpose(echo(X,4,6) ,4) +transpose((X|X) ,-7) ) +((X+transpose(((X+X) +X) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ,7) ) ) |((shuffle(X) +((transpose(X,-7) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +shuffle(X) ) ) +transpose(step((echo(transpose((X+transpose(echo(X,4,6) ,12) ) ,-7) ,4,6) |transpose(transpose(((X|X) +echo(X,4,6) ) ,-7) ,-7) ) ,12) ,12) ) |((arpeggio(((arpeggio(X) |X) +transpose(transpose((step(X,12) +transpose(((X+transpose(X,7) ) |(X+transpose(X,12) ) ) ,12) ) ,4) ,12) ) ) +transpose(echo(((echo(X,4,6) +transpose(transpose(shuffle(X) ,4) ,12) ) +transpose(transpose(shuffle(shuffle(step(X,12) ) ) ,4) ,7) ) ,4,6) ,4) ) +transpose((transpose((transpose((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |arpeggio(X) ) +transpose((step(transpose(X,-5) ,12) +transpose((X|X) ,12) ) ,7) ) ,-5) +arpeggio(transpose(X,4) ) ) ,-5) |(((transpose((transpose(X,-5) |X) ,-7) +transpose((step(X,12) +transpose(X,12) ) ,12) ) |X) +arpeggio((transpose(((transpose(transpose(X,4) ,-5) +transpose(transpose((X+X) ,4) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-7) +transpose(transpose(step(echo(transpose(X,-5) ,4,6) ,12) ,4) ,12) ) ) ) ) ,7) ) ) +transpose((arpeggio(transpose((((transpose(shuffle((echo(shuffle(X) ,4,6) |transpose(transpose(X,4) ,4) ) ) ,-7) +((transpose(transpose(X,-5) ,4) +transpose(((X|X) +transpose((X+X) ,-5) ) ,4) ) +transpose(step(X,12) ,7) ) ) +transpose(echo(transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ,4,6) ,4) ) +transpose((transpose((arpeggio((X+transpose(X,12) ) ) +transpose(transpose((transpose(X,-5) +X) ,-5) ,7) ) ,4) +transpose((X+transpose(X,4) ) ,12) ) ,7) ) ,-5) ) |(((echo(((X+transpose(transpose(X,4) ,4) ) +transpose((X|X) ,7) ) ,4,6) +(step((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) +transpose(transpose((X+transpose(X,12) ) ,-5) ,-7) ) ) +transpose((((transpose(X,-7) +transpose((X+X) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) |arpeggio((X|X) ) ) ,12) ) +transpose((((transpose(X,-7) +transpose((X+transpose(X,-7) ) ,7) ) +transpose(arpeggio((arpeggio(X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,12) ) +(step(((X+transpose(X,7) ) +transpose((X|X) ,7) ) ,12) +(((X+X) +transpose(transpose((X+X) ,-7) ,4) ) +transpose(arpeggio(arpeggio(X) ) ,7) ) ) ) ,7) ) ) ,12) ) ) ,4,6) ,7) ) +transpose(transpose(((transpose((((arpeggio(transpose((echo((X|X) ,4,6) +transpose(step(X,12) ,12) ) ,-7) ) +(transpose(transpose(X,-7) ,-7) +transpose((transpose((arpeggio(X) |X) ,-7) |(transpose((X+X) ,4) +transpose(((step(X,12) +transpose(X,4) ) +transpose((X+X) ,7) ) ,12) ) ) ,7) ) ) +transpose(transpose(step((arpeggio(transpose(transpose(X,-7) ,4) ) +step(X,12) ) ,12) ,-5) ,4) ) +transpose(arpeggio((X+transpose(transpose((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-7) ,7) ) ) ,7) ) ,-5) +transpose(echo((transpose(arpeggio(((echo(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4,6) +transpose((X+transpose(transpose(echo(X,4,6) ,4) ,7) ) ,7) ) |((X+transpose((X+X) ,12) ) |(transpose((X|X) ,-5) |arpeggio(step(X,12) ) ) ) ) ) ,4) +((transpose(transpose((shuffle(step(X,12) ) |(arpeggio(X) +X) ) ,-5) ,-7) |transpose(transpose((transpose(X,4) |transpose(transpose(X,-5) ,-5) ) ,4) ,4) ) +(shuffle((arpeggio((X|shuffle(X) ) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) ) +(((echo((X+X) ,4,6) |step(echo(X,4,6) ,12) ) +transpose(((transpose(X,-5) +transpose(X,12) ) |echo(X,4,6) ) ,4) ) +transpose(echo((step(X,12) |X) ,4,6) ,7) ) ) ) ) ,4,6) ,7) ) +transpose(transpose(transpose(transpose(((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(step((transpose(X,-5) +step(X,12) ) ,12) ,4) ) +transpose(transpose(shuffle(X) ,4) ,7) ) ,-5) ,-5) ,-7) ,4) ) ,-7) ,-7) ) ) ,12) )
random seed used was 152931468

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