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:
# of Tracks:
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After 20 generations the expression "X" became this:
transpose(((shuffle((((shuffle(((transpose((transpose((X|X) ,-5) +(X+transpose(transpose(transpose(shuffle(X) ,4) ,-7) ,-7) ) ) ,-5) +(transpose((transpose(step((((((X+transpose(X,-7) ) +transpose(shuffle((X+transpose(X,7) ) ) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose((shuffle(transpose(X,-7) ) |(shuffle(X) +transpose(transpose(X,4) ,12) ) ) ,4) ) +transpose((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) |((X+transpose(X,12) ) +transpose(transpose(X,-5) ,12) ) ) ,7) ) ,12) ,4) +(transpose((transpose(transpose(transpose(X,-5) ,-7) ,4) |transpose(echo(X,4,6) ,-7) ) ,-7) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ) ,-5) |(shuffle((transpose(transpose(arpeggio(arpeggio(X) ) ,4) ,4) +transpose(arpeggio(transpose(transpose((X+transpose(X,4) ) ,-5) ,4) ) ,12) ) ) +transpose(echo((transpose(shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ,4) |(arpeggio(transpose(X,-5) ) |echo(shuffle(shuffle(X) ) ,4,6) ) ) ,4,6) ,7) ) ) ) |((((arpeggio(transpose(transpose(X,-5) ,-7) ) +transpose(transpose(shuffle(((X|X) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-7) ) ,12) ) ) ,4) ,12) ) |transpose((shuffle((X+X) ) |transpose(X,-7) ) ,4) ) +shuffle(((arpeggio((X+transpose(X,12) ) ) +transpose(X,-5) ) +transpose(transpose(transpose((shuffle((X|X) ) +transpose(echo(X,4,6) ,12) ) ,-7) ,-5) ,12) ) ) ) +transpose(((((transpose(transpose(transpose(X,-5) ,4) ,-7) +transpose(step(transpose(shuffle(echo(X,4,6) ) ,-5) ,12) ,4) ) +transpose((shuffle(((shuffle(X) +transpose((X|X) ,4) ) +transpose((X|X) ,7) ) ) |((shuffle(transpose(X,4) ) |shuffle(X) ) |shuffle(step(transpose(X,-5) ,12) ) ) ) ,7) ) +transpose((transpose(((echo(X,4,6) +transpose((X|shuffle(X) ) ,4) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) ,-5) +transpose(echo(((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,4,6) ,12) ) ,7) ) +((shuffle(shuffle(shuffle((X+transpose(shuffle(X) ,7) ) ) ) ) +(((step(X,12) +transpose(X,7) ) +(transpose(X,4) |transpose(X,-5) ) ) +transpose(shuffle(arpeggio((X+transpose(X,12) ) ) ) ,7) ) ) +shuffle(echo(arpeggio((arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +X) ) +(((transpose(X,-5) |X) +transpose(arpeggio(transpose(X,4) ) ,4) ) +transpose(X,7) ) ) ) ,4,6) ) ) ) ,7) ) ) ) |(((echo(arpeggio(transpose(((X|X) |X) ,4) ) ,4,6) |(((((X+X) +transpose((transpose((X+X) ,4) |shuffle((shuffle(X) +transpose(transpose(X,-7) ,7) ) ) ) ,4) ) +transpose(((X|((transpose(X,-5) +transpose(transpose(X,4) ,4) ) +transpose((X|X) ,7) ) ) +arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,7) ) +transpose(((((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) ) +transpose(shuffle(X) ,12) ) +(shuffle(arpeggio(X) ) +shuffle(transpose(X,4) ) ) ) ,4) ) +transpose(((((((X+X) +transpose(X,4) ) +transpose((transpose(X,4) |X) ,7) ) +transpose(echo(transpose(shuffle(X) ,-7) ,4,6) ,4) ) +transpose(echo((X|shuffle(X) ) ,4,6) ,7) ) +transpose(shuffle((((X+X) |((X+transpose(transpose(X,-5) ,4) ) +transpose((X|X) ,7) ) ) |((transpose((X|X) ,-5) +transpose((transpose(X,-5) +X) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ) ,7) ) ,7) ) ) +shuffle((transpose(transpose(shuffle(X) ,-7) ,4) +(echo(((X|X) +transpose(shuffle(X) ,12) ) ,4,6) +transpose((((arpeggio(echo(X,4,6) ) +transpose(X,4) ) +transpose(step(shuffle(X) ,12) ,7) ) |((X|X) |(X+transpose(X,12) ) ) ) ,7) ) ) ) ) +transpose(step((transpose(((transpose(shuffle((((X+transpose((X|X) ,7) ) +transpose((X|(X|X) ) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,4) +((transpose(X,-7) |shuffle(X) ) +(transpose(X,-7) +((X+(X|X) ) |(echo(X,4,6) |echo(X,4,6) ) ) ) ) ) +shuffle((transpose(arpeggio(shuffle(X) ) ,-5) +((transpose(transpose(transpose(X,4) ,-5) ,4) +transpose((((X|X) |(X|(X|X) ) ) +transpose(((X+X) +transpose(X,7) ) ,12) ) ,4) ) +transpose(((shuffle(X) +transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) +(arpeggio(X) +(X+transpose(X,7) ) ) ) ,7) ) ) ) ) ,-5) +transpose(transpose((transpose(shuffle(((X|step(X,12) ) +(X+X) ) ) ,-5) |transpose(transpose((arpeggio(((X+X) +(X|X) ) ) |((transpose(X,4) +(X+X) ) +transpose((arpeggio(X) +transpose(X,-5) ) ,-7) ) ) ,4) ,-5) ) ,-5) ,7) ) ,12) ,4) ) ) +transpose(shuffle(transpose(transpose((arpeggio((transpose((transpose(X,-7) |step(X,12) ) ,4) +echo((transpose(X,-5) +(X+X) ) ,4,6) ) ) +transpose(shuffle(transpose(step(transpose(transpose(((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +arpeggio((X+transpose(X,12) ) ) ) +transpose((X+((X+X) +X) ) ,7) ) +transpose(arpeggio(step(X,12) ) ,4) ) +transpose(shuffle(((transpose(X,-7) +transpose((X+transpose(X,12) ) ,4) ) +transpose(step(X,12) ,7) ) ) ,7) ) ,-5) ,4) ,12) ,-7) ) ,12) ) ,-7) ,4) ) ,4) ) +transpose(transpose(transpose(transpose(transpose((step((transpose(((X|X) +(X+transpose(transpose(X,-5) ,12) ) ) ,-7) +transpose(shuffle(transpose((transpose(X,-5) |X) ,4) ) ,7) ) ,12) +((transpose((((X|(X+transpose(X,12) ) ) +transpose((step(X,12) +X) ,7) ) |transpose((shuffle((echo(X,4,6) |step(X,12) ) ) |echo(X,4,6) ) ,-5) ) ,-5) +transpose(transpose((step(shuffle((X+transpose(X,12) ) ) ,12) +(transpose(transpose(X,4) ,4) +transpose((transpose(X,-5) |(X|X) ) ,7) ) ) ,4) ,4) ) +transpose(((transpose(step((X+transpose(shuffle(X) ,12) ) ,12) ,-7) +transpose(transpose((((X+transpose(transpose(X,-5) ,12) ) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,-7) ,7) ) +transpose(((((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) +X) +step(transpose(X,4) ,12) ) ,7) ) ,7) ) ) ,-5) ,-7) ,4) ,4) ,7) ) ) +transpose(((shuffle((transpose(echo(((transpose(echo((X+transpose((transpose(X,4) +X) ,7) ) ,4,6) ,4) +transpose(transpose((transpose((shuffle(X) +transpose(transpose(shuffle(X) ,4) ,7) ) ,4) +shuffle(arpeggio(((echo(X,4,6) +transpose(X,12) ) +transpose(((X+X) |X) ,12) ) ) ) ) ,4) ,4) ) +transpose(((((arpeggio((((arpeggio(X) +transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((transpose(X,-7) +transpose(X,12) ) ,7) ) ) |((X+transpose(X,12) ) +transpose(echo(transpose(transpose(X,-7) ,-7) ,4,6) ,12) ) ) +transpose((shuffle((X+transpose(X,12) ) ) |(X+transpose(X,-7) ) ) ,-5) ) |transpose(((shuffle((X+transpose(X,7) ) ) +(X|(X+X) ) ) |echo(((X+transpose(step(X,12) ,4) ) +transpose(X,7) ) ,4,6) ) ,-5) ) +transpose((transpose(arpeggio(transpose(((transpose(X,4) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,7) ) ,-5) ) ,-5) +transpose(transpose((((X+X) |transpose(echo((X+transpose(X,12) ) ,4,6) ,-7) ) +transpose((shuffle((X+X) ) +transpose(shuffle(echo(X,4,6) ) ,12) ) ,7) ) ,-5) ,7) ) ,12) ) ,7) ) ,4,6) ,-5) +transpose(arpeggio(step(transpose((transpose(transpose((transpose(shuffle(transpose(X,-7) ) ,4) +echo(transpose(transpose(arpeggio(transpose(X,-7) ) ,-7) ,4) ,4,6) ) ,4) ,-5) +transpose((transpose((echo((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) |transpose(X,4) ) +transpose((transpose(X,-5) |transpose(X,-7) ) ,4) ) +transpose((shuffle(transpose(transpose(X,-7) ,-5) ) |(((X|X) +transpose(X,4) ) +transpose((transpose(X,-7) +transpose(transpose(X,-7) ,7) ) ,7) ) ) ,7) ) ,4,6) +transpose(echo((X+X) ,4,6) ,4) ) ,4) +(shuffle((arpeggio(transpose(transpose(X,4) ,4) ) +((X|X) +transpose((X|X) ,12) ) ) ) +((transpose(transpose((shuffle(transpose(X,-7) ) |(X|X) ) ,-5) ,-5) +transpose((((((X+X) +(X+X) ) +transpose((transpose(X,-5) |X) ,12) ) |(X+transpose((X+X) ,7) ) ) |X) ,4) ) +transpose(transpose(shuffle((X+step(X,12) ) ) ,4) ,7) ) ) ) ,7) ) ,4) ,12) ) ,7) ) ) +transpose(shuffle(transpose((step(transpose((transpose(shuffle(shuffle((((X+echo(X,4,6) ) +echo(X,4,6) ) +transpose(shuffle(transpose(X,-7) ) ,7) ) ) ) ,4) |transpose((step(transpose((X+X) ,-7) ,12) |step((shuffle(X) |X) ,12) ) ,-5) ) ,-5) ,12) |(step((shuffle(transpose((X|X) ,-7) ) +transpose(transpose(arpeggio((X+transpose(X,7) ) ) ,4) ,7) ) ,12) +transpose((arpeggio((echo(((X|X) +(X+echo(X,4,6) ) ) ,4,6) |transpose(X,4) ) ) +transpose(transpose(transpose((arpeggio(echo((((X+X) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,4,6) ) +transpose((((transpose(X,4) +transpose(transpose((X+transpose((X|X) ,7) ) ,-7) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(arpeggio(((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(shuffle(X) ) ,12) ) ) ,12) ) ,7) ) ,-7) ,-7) ,7) ) ,7) ) ) ,-7) ) ,4) ) +transpose((transpose(shuffle((arpeggio((((((X+shuffle(X) ) +transpose(X,12) ) +transpose((X+transpose(X,12) ) ,7) ) +((transpose(transpose(X,-7) ,4) +transpose((arpeggio(X) +X) ,12) ) |echo(((arpeggio((X|X) ) |(X|X) ) +(transpose(X,4) +transpose((X+X) ,12) ) ) ,4,6) ) ) +transpose(shuffle(transpose(transpose(shuffle((arpeggio(X) +transpose((transpose(X,-7) |X) ,12) ) ) ,4) ,4) ) ,7) ) ) +transpose(((echo(transpose(shuffle(arpeggio((X+X) ) ) ,-5) ,4,6) +transpose(echo(shuffle((X+transpose(X,7) ) ) ,4,6) ,4) ) +transpose(step(transpose(transpose(transpose(X,4) ,4) ,4) ,12) ,7) ) ,12) ) ) ,-7) |(transpose(shuffle(step((((X+transpose(step(((X+transpose(X,7) ) +transpose(X,7) ) ,12) ,12) ) +transpose((transpose((X+transpose(transpose(X,4) ,7) ) ,4) +transpose(transpose(transpose(shuffle(X) ,-7) ,4) ,12) ) ,4) ) +transpose(transpose(((X|X) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) ,-5) ,7) ) ,12) ) ,-5) |transpose(transpose((shuffle(shuffle(transpose(X,-5) ) ) +transpose((((((X+transpose(X,7) ) +transpose(shuffle((X+transpose(X,7) ) ) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) +((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +((shuffle(step(X,12) ) +transpose((shuffle(X) +transpose(X,12) ) ,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ) ,7) ) ,-5) ,4) ) ) ,7) ) ,4) ) +transpose(((((((transpose(shuffle(((shuffle((X+transpose(X,7) ) ) +transpose(transpose(transpose(arpeggio(X) ,-7) ,-7) ,4) ) +transpose(((echo(step(X,12) ,4,6) |(transpose(X,4) |shuffle(X) ) ) +transpose(X,-7) ) ,7) ) ) ,4) +transpose((echo(transpose(shuffle(transpose((transpose(X,4) +transpose(echo(X,4,6) ,12) ) ,-5) ) ,4) ,4,6) |transpose(arpeggio(step(step(X,12) ,12) ) ,-5) ) ,12) ) +((transpose(arpeggio(((transpose(X,4) +transpose((X+X) ,12) ) +transpose(((shuffle(X) +echo(X,4,6) ) +transpose(X,7) ) ,-7) ) ) ,-7) +transpose(transpose(shuffle(((((shuffle((X+X) ) |(X+X) ) +transpose((((X+X) |X) |transpose((X+X) ,-7) ) ,7) ) |transpose((transpose(X,-7) +transpose(X,7) ) ,4) ) +transpose(X,4) ) ) ,-5) ,7) ) |(transpose(arpeggio((transpose(transpose((((X|X) +transpose((X|X) ,4) ) +transpose(arpeggio(X) ,7) ) ,-5) ,-5) +transpose((X|X) ,7) ) ) ,-7) +transpose(((transpose(shuffle(transpose(X,-5) ) ,-5) +transpose(echo(arpeggio(X) ,4,6) ,4) ) +transpose((echo(shuffle(step(X,12) ) ,4,6) +transpose(transpose(shuffle(transpose(X,-7) ) ,4) ,7) ) ,7) ) ,12) ) ) ) |(transpose((shuffle(transpose(shuffle(shuffle(X) ) ,4) ) |(transpose(arpeggio((((X+X) +transpose((X+X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,4) +transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose(transpose((X+X) ,4) ,7) ) ,-5) ) ) ,4) +((((shuffle((shuffle((X+transpose(X,7) ) ) +transpose(echo(transpose((X|X) ,4) ,4,6) ,12) ) ) +transpose(((echo(((shuffle(X) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,4,6) +transpose(((transpose(((X+X) +transpose(X,7) ) ,-5) +transpose((((X|X) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(((X|X) +shuffle((X+X) ) ) ,7) ) ,7) ) +transpose(arpeggio(((X|(X+transpose(X,12) ) ) +transpose(arpeggio(transpose(transpose(X,4) ,4) ) ,12) ) ) ,4) ) +transpose(arpeggio(transpose((shuffle(echo(X,4,6) ) +transpose(X,12) ) ,4) ) ,7) ) +transpose(transpose(transpose(transpose(transpose(arpeggio(transpose((transpose(X,4) +transpose(X,4) ) ,4) ) ,-7) ,-5) ,-5) ,-7) ,12) ) ) ) |echo((((arpeggio(shuffle(((transpose((((X|X) |shuffle(X) ) +transpose((X|X) ,4) ) ,-7) +(((((step((X+transpose(X,7) ) ,12) +transpose(transpose((X+X) ,-5) ,4) ) +transpose((echo(X,4,6) +transpose(X,7) ) ,7) ) +transpose(echo(transpose(X,-7) ,4,6) ,4) ) +transpose((X|X) ,7) ) +transpose(((transpose(((shuffle(X) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,4) ,7) ) ,-7) +transpose(step(step(X,12) ,12) ,4) ) +transpose((X+((X|X) +echo(X,4,6) ) ) ,7) ) ,7) ) ) +transpose(step(((arpeggio(X) +shuffle(X) ) +transpose((X|X) ,12) ) ,12) ,7) ) ) ) +transpose((transpose(transpose(transpose(arpeggio((echo(X,4,6) +transpose(((X+transpose(X,7) ) +X) ,7) ) ) ,-7) ,-7) ,4) |step(echo(((step(shuffle((X+X) ) ,12) +transpose(transpose(arpeggio(step(X,12) ) ,4) ,4) ) +transpose((transpose((transpose(X,-7) +transpose((X+transpose(X,12) ) ,12) ) ,-5) |echo((X+transpose(X,12) ) ,4,6) ) ,7) ) ,4,6) ,12) ) ,4) ) +transpose(shuffle(shuffle(transpose(step(transpose(shuffle(X) ,-7) ,12) ,4) ) ) ,7) ) +(transpose((echo((shuffle(X) +transpose(transpose(X,-5) ,12) ) ,4,6) +transpose(((transpose((shuffle(step(X,12) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ,-7) +transpose(transpose((X+transpose(X,12) ) ,-7) ,12) ) +transpose(transpose(arpeggio(transpose((X+transpose(transpose(X,4) ,12) ) ,-5) ) ,-5) ,12) ) ,7) ) ,-7) +transpose(transpose((echo((X+step(((transpose(X,-5) +transpose(transpose(X,-7) ,4) ) +transpose((transpose(X,4) +transpose(transpose(X,-5) ,7) ) ,7) ) ,12) ) ,4,6) +transpose((transpose(step(X,12) ,-7) +transpose(transpose((X+transpose(X,12) ) ,4) ,-7) ) ,7) ) ,-5) ,7) ) ) ,4,6) ) +transpose(echo(echo(transpose((((echo(transpose(X,-7) ,4,6) +step(((X+transpose(arpeggio(X) ,4) ) +transpose(shuffle(X) ,7) ) ,12) ) |((X+transpose(shuffle((X+transpose(X,7) ) ) ,7) ) +shuffle((((X+transpose(X,12) ) +transpose(X,12) ) |(shuffle(X) |(X+X) ) ) ) ) ) +transpose((shuffle(X) |((shuffle(X) +transpose(transpose(X,4) ,12) ) +X) ) ,12) ) ,4) ,4,6) ,4,6) ,7) ) |(echo(((((arpeggio(echo(transpose(transpose(echo((X+transpose(X,12) ) ,4,6) ,-7) ,-5) ,4,6) ) |((shuffle(arpeggio(echo(X,4,6) ) ) +transpose((((((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose((transpose(X,-5) +transpose(X,12) ) ,12) ) +transpose(((X|X) +arpeggio(X) ) ,7) ) |transpose((X+X) ,4) ) ,4) ) +transpose(((((shuffle((transpose(X,-7) +transpose(X,-5) ) ) +transpose(((shuffle(X) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(transpose((shuffle(X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ,7) ) |transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X|X) ) ,-7) ) +transpose(shuffle((echo((X+transpose(echo(X,4,6) ,12) ) ,4,6) +transpose(X,7) ) ) ,7) ) ,7) ) ) +transpose(((transpose(transpose(shuffle((X+X) ) ,4) ,-7) +((transpose(transpose((X+X) ,-7) ,-5) |transpose(step((transpose(step(X,12) ,-7) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,12) ,-5) ) +((transpose(transpose(transpose(X,-7) ,4) ,-5) +transpose(((step(shuffle(X) ,12) |shuffle((echo(X,4,6) |arpeggio(X) ) ) ) |X) ,4) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ,7) ) ) ) +transpose(((transpose(shuffle(transpose(arpeggio(X) ,-5) ) ,4) |step(transpose(shuffle(X) ,-7) ,12) ) +transpose((transpose((X|X) ,-5) |(((arpeggio(X) |transpose(X,-7) ) +transpose(arpeggio(X) ,4) ) +transpose((step(step(X,12) ,12) +transpose((X|X) ,7) ) ,7) ) ) ,7) ) ,7) ) ,12) ) +transpose(shuffle(transpose(transpose(step(step(transpose(X,4) ,12) ,12) ,-5) ,4) ) ,7) ) |(transpose(transpose(step(transpose((X|X) ,-7) ,12) ,-5) ,-7) |transpose((transpose(transpose(((step(echo(X,4,6) ,12) |echo(shuffle(X) ,4,6) ) +transpose((step((X+X) ,12) |transpose(X,-5) ) ,7) ) ,4) ,-7) +((((((X+X) +transpose(X,4) ) +transpose(X,7) ) +transpose((X|transpose(X,-7) ) ,12) ) +transpose((transpose(transpose(transpose(X,-5) ,-7) ,-7) |transpose(transpose(X,-7) ,-5) ) ,7) ) |((((X+transpose((((X+X) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) |((step(transpose((X+X) ,4) ,12) +transpose(shuffle(X) ,4) ) +transpose(((X+X) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ) +transpose(shuffle((X+transpose(arpeggio(X) ,7) ) ) ,7) ) ) ) ,4) ) ) ,4,6) +transpose(step(echo(transpose(((shuffle(transpose(shuffle(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-5) ) +transpose(transpose(arpeggio(arpeggio(X) ) ,4) ,4) ) +transpose((shuffle((X+transpose(transpose(X,-5) ,7) ) ) +transpose((((((shuffle(X) +transpose(X,-7) ) +transpose(echo(arpeggio(X) ,4,6) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(((X+X) +transpose(X,7) ) ,4) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,12) ) ,7) ) ,-7) ,4,6) ,12) ,12) ) ) ,7) ) ,-7)
random seed used was 31268076

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