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:
(((step(transpose(arpeggio(echo(((shuffle((transpose(X,-7) +transpose((arpeggio(X) +transpose(step(X,12) ,7) ) ,7) ) ) +transpose(arpeggio(echo(step(step((X|X) ,12) ,12) ,4,6) ) ,4) ) +transpose(transpose((transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ,4) |(echo(arpeggio(X) ,4,6) +(step(X,12) |transpose(X,-5) ) ) ) ,-5) ,7) ) ,4,6) ) ,4) ,12) +transpose((shuffle(((shuffle(((echo(step(((transpose(step(shuffle(step(shuffle(X) ,12) ) ,12) ,-5) +transpose(((((echo(transpose(X,-5) ,4,6) +transpose(arpeggio(step(X,12) ) ,4) ) +transpose(transpose((X+transpose(X,-7) ) ,-5) ,7) ) |step(transpose(X,-5) ,12) ) +(arpeggio((step(transpose(X,-7) ,12) |step((X+X) ,12) ) ) +transpose((transpose(X,-5) +transpose(transpose(transpose(step(X,12) ,4) ,4) ,7) ) ,7) ) ) ,7) ) +transpose((((transpose((((step(X,12) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ,12) ) ,-7) +transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) +transpose(X,7) ) +arpeggio((step(X,12) +transpose(transpose(X,-5) ,7) ) ) ) ,7) ) +transpose(echo(transpose(step((X+X) ,12) ,-7) ,4,6) ,4) ) +transpose(transpose((((X+step(X,12) ) +transpose((echo((X+transpose(X,7) ) ,4,6) +((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ) ,12) ) |((step(X,12) +transpose(X,12) ) +transpose(transpose(X,-5) ,12) ) ) ,-5) ,7) ) ,12) ) ,12) ,4,6) +transpose(echo((transpose((echo(transpose(arpeggio(step(X,12) ) ,-7) ,4,6) +transpose(arpeggio(((transpose(shuffle((X+transpose(X,7) ) ) ,-7) +transpose(arpeggio((X+transpose(X,7) ) ) ,-7) ) +((shuffle(step(X,12) ) +transpose(step(transpose(X,4) ,12) ,12) ) |echo((X|X) ,4,6) ) ) ) ,12) ) ,-7) +((arpeggio(((step(X,12) +transpose((X+transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ) +transpose(transpose(arpeggio(transpose(X,-5) ) ,-5) ,7) ) +transpose(step((echo(arpeggio(shuffle(X) ) ,4,6) |arpeggio((X+transpose(step(X,12) ,7) ) ) ) ,12) ,12) ) ) ,4,6) ,4) ) +transpose(transpose(((arpeggio(arpeggio(((transpose(X,-5) +transpose((X+X) ,4) ) +transpose(X,7) ) ) ) |(((((X+transpose((X|X) ,4) ) +transpose((X+X) ,7) ) |((transpose(X,-7) +transpose(echo((((X+transpose(X,7) ) +transpose(arpeggio(X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) ,12) ) +transpose(arpeggio((arpeggio(X) |X) ) ,7) ) ) +transpose(step(transpose(transpose(transpose(X,-5) ,-7) ,-5) ,12) ,4) ) +transpose(step(echo((X+X) ,4,6) ,12) ,7) ) ) |transpose(((step(X,12) +transpose(((shuffle(X) +(X+X) ) +transpose(((((shuffle(X) +transpose(X,4) ) +transpose((X+X) ,7) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +echo(X,4,6) ) ,12) ) ,4) ) +transpose(echo(echo(echo(echo((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4,6) ,4,6) ,4,6) ,7) ) ,-7) ) ,-5) ,7) ) ) +transpose(((shuffle(((((((((transpose(X,4) +transpose(arpeggio(X) ,7) ) +transpose((X|transpose((shuffle(X) +X) ,-7) ) ,7) ) +transpose((transpose(((X+transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ,-7) +transpose(((echo((X+transpose(X,7) ) ,4,6) +transpose(arpeggio(X) ,4) ) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) ,7) ) ,4) ) +transpose(echo((((X|X) +transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,12) ) +transpose((transpose(X,-7) +transpose(X,7) ) ,12) ) ,4,6) ,7) ) +transpose((((transpose(X,-7) +transpose(arpeggio((shuffle(X) +transpose(arpeggio(X) ,7) ) ) ,12) ) |transpose(arpeggio(((arpeggio(X) +transpose(shuffle(X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,4) ) +transpose(transpose(step((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ,-7) ,7) ) ,12) ) +transpose(transpose((((X+transpose(X,7) ) |echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) ,-7) ,12) ) |step((step(arpeggio(((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,12) +shuffle(echo(X,4,6) ) ) ,12) ) +transpose(((echo((echo(((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4,6) +transpose((step((X|X) ,12) |((X+transpose(X,7) ) +(X+X) ) ) ,7) ) ,4,6) +transpose((arpeggio(step((X+transpose(X,7) ) ,12) ) |transpose(transpose((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ,-7) ) ,4) ) +transpose((transpose((X|X) ,-7) +transpose((((X+transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,4) ,7) ) +transpose(((arpeggio(echo((X|X) ,4,6) ) |(X|X) ) +X) ,7) ) ,7) ) ,7) ) ,12) ) ) +transpose((shuffle((((((transpose((X+(X|X) ) ,4) |echo(arpeggio(X) ,4,6) ) +transpose(shuffle((arpeggio(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) +((step((X+transpose(X,7) ) ,12) +transpose(transpose(X,-5) ,4) ) +transpose(step(X,12) ,7) ) ) ) ,7) ) +transpose((arpeggio(transpose(X,-5) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,-5) ,-7) ,12) ) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose((arpeggio(X) |arpeggio(transpose(X,4) ) ) ,7) ) ) +transpose(transpose((shuffle(arpeggio(echo((shuffle(X) +((X+transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ) ,4,6) ) ) +transpose((step((shuffle(X) +transpose(transpose((shuffle(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) ,7) ) ,12) +(((transpose(X,-5) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) +echo(((((X+X) +(X+transpose(X,12) ) ) |(((X+transpose(echo(X,4,6) ,4) ) +transpose((X|X) ,7) ) |transpose(X,-7) ) ) +transpose((X|X) ,12) ) ,4,6) ) |(echo(((transpose(((echo(X,4,6) +transpose(arpeggio(X) ,4) ) +transpose((X|X) ,7) ) ,-5) +transpose((echo(transpose(X,4) ,4,6) +arpeggio((X+transpose(X,7) ) ) ) ,4) ) +transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,4,6) |(arpeggio(((X+transpose((X+X) ,7) ) +transpose(X,7) ) ) +transpose(echo((X+transpose(step(X,12) ,7) ) ,4,6) ,7) ) ) ) ) ,12) ) ,-7) ,7) ) ,4) ) +transpose((transpose((echo(((step((((((arpeggio(X) +X) +transpose((transpose((X+X) ,4) +transpose(step(X,12) ,12) ) ,7) ) +transpose(step(arpeggio(X) ,12) ,4) ) +transpose(((X+transpose(shuffle(X) ,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) +transpose(transpose((transpose(X,-7) +transpose(arpeggio(step(transpose(X,4) ,12) ) ,12) ) ,4) ,12) ) ,12) +transpose(echo(transpose(transpose(((X|X) +(X+transpose(X,12) ) ) ,4) ,-5) ,4,6) ,4) ) +transpose(shuffle(((X+transpose(arpeggio(X) ,12) ) +transpose(shuffle(X) ,-7) ) ) ,7) ) ,4,6) |echo((transpose(arpeggio(step(shuffle(X) ,12) ) ,-5) +transpose(transpose(((step(X,12) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,4) ,12) ) ,4,6) ) ,-5) +arpeggio(((step(((transpose((step(X,12) +arpeggio(X) ) ,-5) +transpose(shuffle(X) ,4) ) +transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,12) +transpose(transpose(transpose(shuffle(shuffle(X) ) ,4) ,-5) ,7) ) +transpose((transpose(echo((X+transpose(((X+transpose(shuffle(X) ,4) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) ,7) ) ,4,6) ,-7) +transpose((shuffle((((echo(X,4,6) +transpose(((step(echo(X,4,6) ,12) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(arpeggio(X) ,-5) ,7) ) ,4) ) +transpose(X,7) ) |transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,-5) ) ) +transpose(shuffle((echo(echo(X,4,6) ,4,6) +(shuffle(X) |echo(X,4,6) ) ) ) ,7) ) ,7) ) ,7) ) ) ) ,7) ) ,4) ) +transpose(step(step(((arpeggio(arpeggio(transpose(arpeggio(shuffle((arpeggio(((arpeggio(X) +transpose(X,4) ) +transpose(X,7) ) ) +((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) ) ,-7) ) ) +transpose(transpose(step(arpeggio((echo(step((X+transpose(X,12) ) ,12) ,4,6) +echo(arpeggio(echo(X,4,6) ) ,4,6) ) ) ,12) ,4) ,4) ) +transpose((((((arpeggio((X+transpose(transpose(shuffle(X) ,4) ,7) ) ) +transpose(arpeggio(((X+transpose(X,4) ) |((arpeggio(X) +transpose((X+X) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ) ,7) ) |(shuffle((X+transpose(X,7) ) ) +transpose((arpeggio(transpose((X+X) ,4) ) +(step((X+transpose(X,12) ) ,12) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ) ) ,7) ) ) +transpose(shuffle((transpose(((echo((X+transpose(X,12) ) ,4,6) +transpose(echo(X,4,6) ,4) ) +transpose(transpose((X|step(X,12) ) ,4) ,7) ) ,-7) +transpose((shuffle(X) +(X+X) ) ,12) ) ) ,7) ) +transpose(step(echo(shuffle(transpose(transpose(X,-7) ,4) ) ,4,6) ,12) ,7) ) +transpose(shuffle(((transpose(echo(((X+transpose(X,12) ) +transpose((arpeggio(X) |(X+X) ) ,7) ) ,4,6) ,-5) +((transpose(step(arpeggio(X) ,12) ,-5) +transpose(arpeggio(((echo(X,4,6) +transpose(step(X,12) ,4) ) +transpose(step(transpose(X,4) ,12) ,7) ) ) ,4) ) +transpose(((step(step(X,12) ,12) +transpose(arpeggio(step(X,12) ) ,4) ) +transpose(((arpeggio(X) +transpose(echo(X,4,6) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,7) ) ) +(shuffle(X) |transpose(((step(X,12) +transpose((X+X) ,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ) ) ) ,7) ) ,7) ) ,12) ,12) ,7) ) ) +echo(step(shuffle(echo(step(((shuffle(((((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |transpose(X,-5) ) |echo(echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4,6) ,4,6) ) +transpose(transpose(transpose((X+X) ,-7) ,-5) ,4) ) +transpose(step(((echo(X,4,6) +transpose((X|X) ,7) ) |shuffle((X+transpose(X,7) ) ) ) ,12) ,7) ) +transpose(transpose(((((echo(X,4,6) +transpose(arpeggio(step((X|X) ,12) ) ,12) ) +transpose(shuffle(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose(echo(echo((X+transpose(X,7) ) ,4,6) ,4,6) ,7) ) +transpose(echo(arpeggio(arpeggio(X) ) ,4,6) ,7) ) ,4) ,7) ) ) +transpose((arpeggio((((arpeggio(X) +transpose(transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ,12) ) +transpose(echo(transpose((echo(transpose(X,4) ,4,6) |(echo(X,4,6) +transpose(shuffle((((X+X) +transpose(X,4) ) +transpose((X|X) ,7) ) ) ,7) ) ) ,4) ,4,6) ,4) ) +transpose(shuffle(echo((arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) ) +transpose((X|transpose(X,4) ) ,12) ) ,4,6) ) ,7) ) ) +transpose((transpose(shuffle(echo(step(echo(step(X,12) ,4,6) ,12) ,4,6) ) ,4) +transpose(step(step(arpeggio(X) ,12) ,12) ,7) ) ,7) ) ,4) ) +transpose((transpose(transpose((echo(shuffle((X+transpose(X,7) ) ) ,4,6) +transpose(step((((transpose(X,4) +transpose((X+transpose(X,7) ) ,4) ) +transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) ,12) ,7) ) ,-5) ,4) +transpose(arpeggio(step((arpeggio(step(transpose((transpose(X,-7) +transpose(X,-7) ) ,-5) ,12) ) +transpose(shuffle(echo(shuffle(((X+transpose(X,7) ) +X) ) ,4,6) ) ,7) ) ,12) ) ,12) ) ,7) ) ,12) ,4,6) ) ,12) ,4,6) ) ,4) ) +transpose(step(arpeggio((echo(((arpeggio((shuffle(echo(step((shuffle((X+transpose((X+step(X,12) ) ,12) ) ) +transpose(transpose(step((X+X) ,12) ,-5) ,7) ) ,12) ,4,6) ) +transpose((transpose(step(transpose(arpeggio(((echo(X,4,6) +transpose(arpeggio(shuffle(transpose(X,-5) ) ) ,4) ) +transpose(arpeggio(echo(X,4,6) ) ,7) ) ) ,4) ,12) ,4) +step(step(transpose(((X+(X+transpose(X,12) ) ) +transpose(X,7) ) ,-7) ,12) ,12) ) ,7) ) ) +transpose(step(((shuffle((arpeggio(((step(transpose((X+transpose(X,7) ) ,-5) ,12) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-5) ,4) ) +transpose(step(((transpose(echo(X,4,6) ,4) +transpose((echo(X,4,6) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(((X+X) +transpose(X,4) ) ,7) ) ,12) ,7) ) ) +transpose((transpose(arpeggio(transpose((X+transpose(X,7) ) ,-5) ) ,4) |transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-5) ) ) ,-7) ) ,7) ) ) +transpose(transpose(((echo(X,4,6) |transpose((arpeggio(X) |X) ,-5) ) +step((((arpeggio(step(X,12) ) +transpose(arpeggio(X) ,7) ) |shuffle(((arpeggio(X) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ) ) +transpose(step(shuffle(echo(echo(X,4,6) ,4,6) ) ,12) ,7) ) ,12) ) ,4) ,4) ) +transpose(step((arpeggio((((((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose((shuffle(X) +X) ,7) ) |(X+arpeggio(X) ) ) +(step(echo(X,4,6) ,12) +step(X,12) ) ) +transpose(shuffle(X) ,7) ) ) +step(transpose(transpose((X+transpose(X,7) ) ,4) ,-7) ,12) ) ,12) ,7) ) ,12) ,4) ) +transpose((arpeggio(arpeggio(arpeggio((arpeggio(arpeggio(X) ) +((shuffle(X) +transpose(((X+X) |(X+transpose(X,7) ) ) ,4) ) +transpose(X,7) ) ) ) ) ) +transpose(((transpose(step(arpeggio(step(X,12) ) ,12) ,-7) +transpose(echo(((transpose(X,-5) +transpose(shuffle(X) ,7) ) +transpose(transpose(echo((((X+transpose(X,7) ) +transpose(X,7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(X+X) ) ,12) ) ,4,6) ,4) ,7) ) ,4,6) ,4) ) +transpose(transpose((transpose(shuffle(transpose(X,-5) ) ,4) +transpose(((((shuffle(transpose(((X+transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose(step(X,12) ,4) ) +transpose((X+transpose((transpose(X,-7) +transpose((X|X) ,12) ) ,7) ) ,7) ) +transpose(shuffle(transpose(transpose(X,4) ,-5) ) ,4) ) +transpose(echo(transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,4) ,4) ,4,6) ,7) ) ,7) ) ,-5) ,7) ) ,12) ) ,7) ) ,4,6) +(transpose(step(((((echo(step(transpose(transpose(X,4) ,-5) ,12) ,4,6) +transpose(step(((arpeggio(transpose(transpose(shuffle(X) ,-7) ,-7) ) +transpose((((X+transpose((X+transpose(X,12) ) ,7) ) +transpose(shuffle(X) ,4) ) +transpose(transpose(((X+transpose((X+X) ,4) ) +transpose((X+X) ,7) ) ,-7) ,7) ) ,4) ) +transpose(transpose(transpose(((X+transpose(X,7) ) +transpose(shuffle(X) ,7) ) ,4) ,-7) ,7) ) ,12) ,12) ) +(((((((echo(X,4,6) +transpose(shuffle(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,-7) ,7) ) +transpose(echo((((X|X) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,4,6) ,7) ) +transpose((((echo(X,4,6) +transpose(shuffle((X+transpose(X,7) ) ) ,4) ) +transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose((X+X) ,7) ) ,7) ) ,7) ) +transpose(echo(((X+transpose(X,4) ) +transpose((X|X) ,12) ) ,4,6) ,7) ) ,4) ) +transpose(((transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +((X+X) +transpose(X,12) ) ) ,-7) +transpose(echo(X,4,6) ,4) ) +transpose(arpeggio(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,7) ) ,7) ) +transpose((arpeggio(step(step(X,12) ,12) ) +(step(step(shuffle(X) ,12) ,12) +transpose(step(arpeggio(transpose(X,-7) ) ,12) ,7) ) ) ,4) ) +transpose(((arpeggio(transpose((echo(X,4,6) +transpose(transpose(X,-5) ,7) ) ,-7) ) +transpose((transpose(X,4) +arpeggio((transpose(X,4) |X) ) ) ,7) ) +((transpose(echo(echo(step(X,12) ,4,6) ,4,6) ,-7) +transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose(transpose(step(X,12) ,-7) ,7) ) ) ,7) ) ) +transpose((((transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,12) ) |arpeggio(X) ) ,4) ) +transpose(transpose(shuffle(X) ,-5) ,7) ) ,4) +(step(transpose(shuffle(X) ,-5) ,12) +(X+X) ) ) +transpose(shuffle((((X+transpose(arpeggio(step(X,12) ) ,4) ) +transpose(transpose(arpeggio(shuffle(X) ) ,-5) ,7) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ) ,4) ) +transpose(step(arpeggio(step(step(echo((X+transpose(X,7) ) ,4,6) ,12) ,12) ) ,12) ,7) ) ,4) ) +transpose((((echo((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) |(((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,4) ) ) +transpose((step(X,12) +transpose(((X+transpose(X,7) ) |echo(X,4,6) ) ,12) ) ,4) ) +transpose((((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +echo((shuffle(X) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) ) +transpose(echo(((shuffle((X+X) ) +transpose(X,4) ) +transpose(X,7) ) ,4,6) ,7) ) +(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(transpose(X,-7) ,7) ) ,7) ) +echo(((step(X,12) +transpose(transpose(step(X,12) ,4) ,4) ) +transpose(X,7) ) ,4,6) ) ) +transpose(echo(((((X|X) |transpose(X,-7) ) +transpose(step(X,12) ,7) ) +echo(transpose(X,4) ,4,6) ) ,4,6) ,12) ) ,7) ) ,7) ) ,12) ,-7) +transpose(transpose((arpeggio(arpeggio((((arpeggio((X+(X|X) ) ) +transpose(transpose(transpose(step(X,12) ,-7) ,-7) ,12) ) +transpose(transpose(transpose((step(X,12) +X) ,-7) ,4) ,4) ) +transpose(echo(step(X,12) ,4,6) ,7) ) ) ) +transpose(shuffle(transpose(echo(transpose(((echo(transpose(arpeggio(X) ,4) ,4,6) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,7) ) +transpose(transpose((step(X,12) |X) ,4) ,4) ) +transpose(transpose(step(X,12) ,-5) ,7) ) ,4) ) +transpose(shuffle(echo(shuffle((X|X) ) ,4,6) ) ,7) ) ,-5) ,4,6) ,-7) ) ,12) ) ,4) ,12) ) ) ) ,12) ,7) ) +transpose(((transpose(transpose(arpeggio((echo(transpose(step(step(echo(((transpose(((step(X,12) +transpose(arpeggio(X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) +transpose(shuffle(transpose((X+transpose(X,12) ) ,4) ) ,4) ) +transpose(shuffle((echo(X,4,6) +transpose(shuffle(X) ,12) ) ) ,7) ) ,4,6) ,12) ,12) ,-7) ,4,6) +transpose(step((arpeggio((((((((step(X,12) +transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) +transpose(arpeggio(((((X|X) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) |(X+transpose(X,7) ) ) ) ,7) ) +transpose((((transpose(transpose((X+transpose(X,7) ) ,4) ,-5) +transpose(echo(X,4,6) ,4) ) +transpose(step(((arpeggio(X) +(X+transpose(X,7) ) ) +transpose(X,-7) ) ,12) ,7) ) +transpose(step((((X+transpose(X,4) ) +transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,7) ) ,4) ) +transpose(transpose((transpose(transpose(shuffle(X) ,4) ,4) +((X+X) +((shuffle(X) +transpose(shuffle(X) ,4) ) +transpose(arpeggio(X) ,7) ) ) ) ,4) ,7) ) +transpose((transpose(X,4) +transpose((X|X) ,7) ) ,12) ) +transpose(((shuffle(transpose(transpose(arpeggio(X) ,-7) ,-5) ) +transpose((arpeggio(((arpeggio(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) ) +transpose(transpose(arpeggio(X) ,-7) ,4) ) +transpose(transpose(step(X,12) ,4) ,7) ) ) +transpose(transpose(((X+transpose((((X+transpose(X,4) ) +transpose(X,7) ) +echo(X,4,6) ) ,12) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ,-5) ,7) ) ,4) ) +transpose(step(arpeggio(transpose((transpose((X|X) ,-7) +transpose(X,12) ) ,-7) ) ,12) ,7) ) ,4) ) +transpose(shuffle(transpose(step(((transpose(X,-5) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,12) ,-7) ) ,7) ) ) +transpose(step(shuffle((shuffle(arpeggio((step(arpeggio(X) ,12) +transpose((X+transpose(X,7) ) ,4) ) ) ) +transpose(shuffle(((shuffle(transpose(X,-5) ) +transpose(transpose(step(X,12) ,4) ,4) ) +transpose(((arpeggio(((X+transpose(X,7) ) |(X|X) ) ) +transpose(arpeggio((X+transpose((X|X) ,7) ) ) ,4) ) +transpose(transpose((transpose(X,4) +X) ,4) ,7) ) ,7) ) ) ,7) ) ) ,12) ,7) ) ,12) ,7) ) ) ,-7) ,4) +transpose(transpose((((step((((((((arpeggio(X) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +(X+transpose(X,7) ) ) +transpose(arpeggio(X) ,7) ) ,7) ) +transpose(echo(X,4,6) ,12) ) +transpose(transpose((echo(shuffle(X) ,4,6) +echo(X,4,6) ) ,-5) ,7) ) +transpose(step(echo(arpeggio((X+transpose(X,12) ) ) ,4,6) ,12) ,4) ) +transpose(transpose((((((X+transpose(X,4) ) +transpose(X,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(echo((shuffle(step(X,12) ) +(shuffle(X) +transpose((X|X) ,7) ) ) ,4,6) ,4) ) +transpose(((((transpose(X,-5) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(X,7) ) +echo(step(X,12) ,4,6) ) ,7) ) ,4) ,7) ) +arpeggio(((arpeggio((echo(transpose(X,-5) ,4,6) |transpose(((X+transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,-5) ) ) +transpose(((echo(shuffle(X) ,4,6) |transpose((X|step(X,12) ) ,4) ) +transpose(((((transpose(X,-7) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +transpose(echo((step(X,12) +X) ,4,6) ,7) ) +transpose(transpose(transpose(X,4) ,-7) ,4) ) +transpose((((X+transpose(echo(X,4,6) ,7) ) +transpose((X|X) ,4) ) +transpose(transpose((X+X) ,-5) ,7) ) ,7) ) ,12) ) ,4) ) +transpose(step(echo(((arpeggio(X) +transpose(X,7) ) |arpeggio(transpose(X,-7) ) ) ,4,6) ,12) ,7) ) ) ) +transpose(((((((echo(((X|X) +transpose(echo(X,4,6) ,7) ) ,4,6) +transpose((echo(transpose(X,4) ,4,6) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(shuffle(((X+transpose(X,7) ) +transpose(X,12) ) ) ,7) ) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) |echo((transpose(echo(X,4,6) ,4) |echo(X,4,6) ) ,4,6) ) +transpose(transpose(step((((((shuffle(X) +transpose(step(X,12) ,4) ) +transpose(arpeggio(shuffle(X) ) ,7) ) +(transpose(X,-5) |step(X,12) ) ) +transpose(transpose(transpose((((X+X) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ,-5) ,4) ) +transpose(echo(transpose((((X+transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-5) ,4,6) ,7) ) ,12) ,4) ,7) ) ,7) ) ,12) |step(shuffle((transpose(shuffle(echo(transpose(shuffle(arpeggio(X) ) ,-7) ,4,6) ) ,-5) +arpeggio(((step(arpeggio(shuffle(step(step(X,12) ,12) ) ) ,12) +transpose(step(step(arpeggio(shuffle(((X+X) |echo(X,4,6) ) ) ) ,12) ,12) ,12) ) +transpose((arpeggio((((step(transpose((X|X) ,4) ,12) |transpose((transpose(X,-5) +transpose(shuffle(X) ,12) ) ,4) ) +transpose(transpose((((X|X) |transpose(X,-7) ) +transpose((X|X) ,12) ) ,4) ,4) ) +transpose(shuffle(step(transpose(shuffle(X) ,-7) ,12) ) ,7) ) ) +transpose(step(transpose((((transpose(X,-7) +transpose((shuffle(step(X,12) ) +transpose(X,7) ) ,7) ) +transpose(((X+transpose(X,12) ) |(X+transpose(X,7) ) ) ,4) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) ,4) ,12) ,12) ) ,7) ) ) ) ) ,12) ) +transpose((step((transpose(shuffle(step(transpose(X,-7) ,12) ) ,-7) +transpose((echo(((((X+transpose(echo(X,4,6) ,7) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose((transpose(X,4) +(X+X) ) ,7) ) ,4,6) +transpose(echo((X+transpose((X+transpose(X,7) ) ,12) ) ,4,6) ,-5) ) ,7) ) ,12) +transpose(step(echo((transpose((shuffle(step(transpose(X,-5) ,12) ) +transpose(step(((shuffle(((X+transpose(X,7) ) +transpose(X,7) ) ) +transpose(((arpeggio(X) +transpose(echo(X,4,6) ,12) ) +transpose(transpose(X,-7) ,7) ) ,7) ) +transpose(transpose(echo((X+transpose(X,12) ) ,4,6) ,-5) ,12) ) ,12) ,7) ) ,-5) +transpose(((((step(arpeggio(X) ,12) +transpose(((((X+transpose((X+transpose(transpose(X,-5) ,7) ) ,7) ) +transpose((echo(X,4,6) |shuffle(X) ) ,4) ) +transpose(transpose(X,-7) ,7) ) |arpeggio(step(X,12) ) ) ,4) ) +transpose(transpose(step(((X+transpose((echo(X,4,6) +transpose(step(X,12) ,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ,4) ,7) ) |transpose(arpeggio(step((X|X) ,12) ) ,4) ) +transpose(echo(echo(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) +shuffle(arpeggio(X) ) ) ,4,6) ,4,6) ,12) ) ,7) ) ,4,6) ,12) ,7) ) ,4) ) +transpose(echo(arpeggio((((step((transpose(transpose(transpose((X+transpose(transpose(X,4) ,7) ) ,4) ,4) ,-7) +((echo(arpeggio((shuffle(shuffle(X) ) +transpose(shuffle(X) ,7) ) ) ,4,6) +transpose((transpose((arpeggio(transpose(arpeggio(X) ,4) ) |step(X,12) ) ,-7) +step((X+X) ,12) ) ,4) ) +transpose(shuffle(transpose(transpose(shuffle(X) ,-5) ,4) ) ,7) ) ) ,12) +echo(step((step(arpeggio(((X+X) +transpose(transpose(X,-5) ,7) ) ) ,12) +transpose(((shuffle(X) +arpeggio(shuffle(X) ) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ,-7) ) ,12) ,4,6) ) +transpose(((transpose(((arpeggio(((arpeggio(X) +transpose(arpeggio((((X+transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ) +transpose((transpose(transpose(arpeggio(X) ,-7) ,-7) +transpose(echo((transpose(echo(X,4,6) ,-5) +transpose(step(X,12) ,7) ) ,4,6) ,7) ) ,4) ) +transpose((shuffle(X) |arpeggio(X) ) ,7) ) ,4) +transpose(echo((((transpose(step(X,12) ,4) +transpose(step(X,12) ,7) ) +transpose(arpeggio(arpeggio(X) ) ,12) ) +((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,7) ) +transpose((((arpeggio((X+transpose(echo(arpeggio((X+transpose(transpose(X,-5) ,7) ) ) ,4,6) ,7) ) ) +((echo(((arpeggio(transpose(X,4) ) +transpose(transpose(step(X,12) ,-5) ,4) ) +transpose((X|X) ,7) ) ,4,6) +transpose(step(transpose((arpeggio(X) +transpose((X|X) ,-7) ) ,-7) ,12) ,4) ) +transpose(((shuffle(arpeggio(step(X,12) ) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ) +transpose((step(((echo(transpose(transpose(X,-5) ,4) ,4,6) +transpose(X,4) ) +transpose(((arpeggio(X) +transpose((echo(transpose(X,-5) ,4,6) +transpose(X,-5) ) ,4) ) +transpose(arpeggio((X|X) ) ,7) ) ,7) ) ,12) +transpose((((((shuffle(X) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((X+transpose(X,7) ) ,12) ) +transpose(transpose(shuffle(transpose(X,-5) ) ,-7) ,7) ) +transpose(((step(transpose(X,-7) ,12) +shuffle(X) ) +transpose(arpeggio(X) ,7) ) ,7) ) ,-7) ) ,4) ) +transpose(echo(step(transpose(echo(step(X,12) ,4,6) ,4) ,12) ,4,6) ,7) ) ,-7) ) ,4) ) +transpose(arpeggio(transpose(echo((step((X|X) ,12) |(step(transpose(X,4) ,12) +transpose((X+transpose(transpose(transpose(X,-5) ,-5) ,7) ) ,7) ) ) ,4,6) ,4) ) ,7) ) ) ,4,6) ,7) ) ,4) ,4) ) +transpose(transpose(transpose(transpose((((step(shuffle(step((((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,7) ) ,12) ) ,12) +(X+(X+transpose(X,12) ) ) ) +transpose(arpeggio(arpeggio(shuffle(((shuffle(transpose(X,4) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(echo(X,4,6) ,7) ) ,7) ) +transpose(echo(shuffle((X|X) ) ,4,6) ,12) ) ) ) ) ,4) ) +transpose((echo(transpose((((((echo((X+transpose(echo(X,4,6) ,7) ) ,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((((X+transpose(X,7) ) +transpose((X+X) ,7) ) +transpose(echo(X,4,6) ,4) ) ,7) ) +transpose(step(echo(shuffle(X) ,4,6) ,12) ,4) ) +transpose(shuffle(((X|X) |(X|X) ) ) ,7) ) +transpose(shuffle(((X+transpose(echo((X+shuffle(X) ) ,4,6) ,4) ) +transpose(shuffle((((X+X) +transpose(X,4) ) +transpose((X+X) ,7) ) ) ,7) ) ) ,12) ) ,-7) ,4,6) +transpose((((echo(((X+transpose(X,7) ) +X) ,4,6) +transpose((arpeggio(arpeggio(transpose(shuffle(X) ,4) ) ) +transpose(((((arpeggio(transpose(X,-5) ) +transpose(step(X,12) ,7) ) +transpose(transpose(step(X,12) ,4) ,4) ) +transpose(transpose(echo((X|X) ,4,6) ,-7) ,7) ) +transpose((X+transpose(step(X,12) ,12) ) ,7) ) ,12) ) ,4) ) +transpose(transpose(((echo(X,4,6) +transpose(step(((transpose(X,-7) |X) +transpose(X,12) ) ,12) ,4) ) +transpose(X,7) ) ,-7) ,7) ) |((echo(((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) +transpose(((arpeggio(echo(X,4,6) ) |(shuffle(echo(X,4,6) ) +transpose((X|X) ,7) ) ) +transpose(step(transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,-5) ,12) ,12) ) ,4) ) +transpose(((X+transpose((X+transpose(X,7) ) ,7) ) +(echo(X,4,6) +transpose(step(X,12) ,7) ) ) ,7) ) ) ,12) ) ,7) ) ,4) ,-5) ,-7) ,7) ) ,7) )
random seed used was 248310337

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