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(step(((((((shuffle(transpose(step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ,-7) ) +transpose(transpose((((transpose(transpose(X,4) ,-7) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) +transpose(step(transpose(transpose(X,-7) ,-7) ,12) ,4) ) +transpose(((((X|X) +(X+transpose(X,7) ) ) |transpose(X,4) ) +transpose(transpose(arpeggio(X) ,-7) ,7) ) ,7) ) ,-5) ,4) ) +transpose(((echo((((X+transpose(X,7) ) +transpose((transpose(X,-7) +X) ,7) ) +transpose(step(X,12) ,7) ) ,4,6) +transpose(shuffle(transpose(X,-5) ) ,4) ) +transpose((((arpeggio(X) +transpose(X,12) ) +((X+transpose(X,7) ) +step(X,12) ) ) +transpose(arpeggio(step(X,12) ) ,7) ) ,7) ) ,7) ) +transpose((shuffle((arpeggio(((step(X,12) +transpose(transpose(X,-5) ,12) ) +transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,7) ) ) +(step(X,12) +transpose((X+step(X,12) ) ,7) ) ) ) |step((shuffle(transpose(echo(transpose(X,4) ,4,6) ,4) ) +step(arpeggio((X+transpose(X,7) ) ) ,12) ) ,12) ) ,4) ) +transpose((transpose((echo(transpose((((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) ,-5) ,4,6) +transpose(transpose(transpose((X|X) ,-5) ,-7) ,12) ) ,-5) |(transpose(step((X+transpose(X,7) ) ,12) ,-5) +transpose(transpose(X,-7) ,7) ) ) ,7) ) +transpose(echo(transpose(((transpose(step((((X+transpose(X,12) ) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ,-5) |(transpose(X,-7) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |((X+transpose(X,12) ) +transpose(transpose(X,-5) ,7) ) ) ,12) ) ) +transpose((transpose(shuffle(X) ,-5) |transpose(transpose(shuffle(X) ,-7) ,-5) ) ,12) ) ,-7) ,4,6) ,7) ) +transpose((((arpeggio(step(arpeggio(transpose((transpose((X|X) ,4) +transpose(shuffle(X) ,12) ) ,-7) ) ,12) ) |step(transpose(transpose(transpose(step((X+transpose(X,12) ) ,12) ,-7) ,-5) ,-5) ,12) ) +transpose(echo(transpose((transpose(arpeggio(X) ,-7) +transpose((transpose(arpeggio(X) ,-5) +arpeggio(step(X,12) ) ) ,12) ) ,4) ,4,6) ,7) ) +transpose(echo((transpose(transpose(shuffle(((X+transpose(X,12) ) +transpose(X,12) ) ) ,-7) ,-7) |(transpose((X+transpose((X+transpose((X|X) ,7) ) ,12) ) ,-5) +transpose(transpose(arpeggio(transpose(step(X,12) ,-5) ) ,-5) ,-7) ) ) ,4,6) ,12) ) ,7) ) ,12) ,-5) +transpose((transpose(echo(echo(((transpose(transpose(echo((X+transpose(X,7) ) ,4,6) ,-7) ,-7) +transpose(transpose(((transpose(((step(X,12) +transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-7) +transpose((transpose(transpose(X,-5) ,-5) +transpose(transpose(X,-5) ,12) ) ,7) ) +transpose(transpose((((arpeggio(X) +transpose(echo(((X+transpose(X,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,4) ) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) +transpose((((X+transpose(step(X,12) ,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,-5) ) ,4) ,7) ) ,-7) ,12) ) +transpose(transpose((((echo(echo(transpose(X,-7) ,4,6) ,4,6) +transpose((((((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) +transpose((arpeggio(X) +transpose(X,12) ) ,4) ) +transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,7) ) |echo(X,4,6) ) ,7) ) +transpose((((step(X,12) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(((transpose(X,-7) +transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,4) ) +transpose((echo(X,4,6) +X) ,7) ) ,-5) ,12) ) ,12) ) +(transpose(transpose(((X+transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) ,4) ,-5) |((step(transpose(X,4) ,12) +transpose(((step(step(arpeggio(X) ,12) ,12) +transpose((transpose(transpose(X,4) ,4) +transpose(shuffle(X) ,7) ) ,4) ) +transpose(transpose(((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,-7) ,7) ) ,4) ) +transpose((transpose(transpose(X,-7) ,4) +transpose(arpeggio(echo(echo((X+transpose(X,12) ) ,4,6) ,4,6) ) ,12) ) ,7) ) ) ) ,-5) ,7) ) ,4,6) ,4,6) ,-7) +transpose(transpose(transpose(((transpose(transpose((transpose(step(((transpose(X,-7) +transpose((X+X) ,12) ) +transpose((transpose(X,-7) +transpose(X,7) ) ,12) ) ,12) ,-7) +transpose((((((transpose(transpose(X,-5) ,-7) +transpose(transpose(shuffle(X) ,-5) ,4) ) +transpose(X,7) ) +transpose(X,-5) ) +transpose(transpose(X,-5) ,12) ) |echo(X,4,6) ) ,7) ) ,4) ,-5) +transpose(transpose((shuffle(transpose(transpose(transpose(shuffle((X|X) ) ,-7) ,4) ,-5) ) +(step(X,12) +((transpose(X,-7) +transpose((X+transpose(X,7) ) ,4) ) +transpose(arpeggio(step(X,12) ) ,7) ) ) ) ,4) ,12) ) +transpose(((transpose(arpeggio((step(transpose((X+echo(X,4,6) ) ,-5) ,12) |(((X|X) +transpose(arpeggio(step(X,12) ) ,12) ) +transpose((step(X,12) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ) ) ,-5) +transpose((((transpose(X,-7) +((transpose(X,-5) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ) +transpose(((echo(transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ,4,6) +transpose((((((transpose(((X+transpose(X,12) ) +(X|X) ) ,-5) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(shuffle(arpeggio((X+transpose(echo(X,4,6) ,7) ) ) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(((transpose(X,-7) +transpose(arpeggio(X) ,12) ) +transpose(echo(((transpose((X+transpose(X,12) ) ,-5) +transpose(step(shuffle(X) ,12) ,4) ) +transpose(arpeggio(X) ,7) ) ,4,6) ,12) ) ,7) ) ,4) ) +transpose((shuffle((echo(X,4,6) +((X+transpose(X,7) ) +X) ) ) +echo(step((step(X,12) +transpose((X+X) ,12) ) ,12) ,4,6) ) ,7) ) ,7) ) +transpose(transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(((step(X,12) +transpose(X,7) ) +step((X|X) ,12) ) ,12) ) ,-5) ,-7) ) ,4) ) +transpose((shuffle(step(((step(X,12) +transpose(transpose(X,-7) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) +transpose(shuffle(echo(arpeggio((transpose(X,-7) +shuffle(X) ) ) ,4,6) ) ,12) ) ,7) ) ,12) ) ,-5) ,-5) ,7) ) ,12) ) +transpose(((shuffle(((transpose(((echo(step((X+transpose(X,12) ) ,12) ,4,6) +transpose(transpose(arpeggio((transpose(((transpose(X,-7) +transpose((X+transpose(X,7) ) ,12) ) |echo(X,4,6) ) ,-7) +transpose((echo((X+transpose(X,7) ) ,4,6) |(transpose(X,-5) +arpeggio(X) ) ) ,12) ) ) ,4) ,7) ) +shuffle(transpose(transpose(transpose(((((transpose(X,-5) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(transpose(X,-7) ,12) ) +transpose((X+transpose((step(X,12) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,7) ) ,-7) ,-7) ,-5) ) ) ,-7) +transpose(((((((echo(transpose(X,-7) ,4,6) +transpose(transpose(arpeggio((X+X) ) ,-5) ,4) ) +transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4) ,7) ) |transpose(echo(echo(echo(transpose(X,-5) ,4,6) ,4,6) ,4,6) ,-7) ) +transpose(step(echo(((step((((transpose(X,4) +transpose((X+transpose(X,12) ) ,4) ) +transpose(shuffle(X) ,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) +transpose(transpose(shuffle(X) ,-5) ,4) ) +transpose((((X+X) +transpose(transpose(((step(X,12) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,-7) ,12) ) +transpose(transpose(X,4) ,12) ) ,7) ) ,4,6) ,12) ,12) ) +transpose(transpose(transpose(echo(((echo((arpeggio(X) +shuffle(X) ) ,4,6) +transpose(arpeggio(X) ,12) ) +transpose((((X+transpose(transpose(X,-7) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(X,7) ) ,12) ) ,4,6) ,-7) ,4) ,12) ) ,12) ) +transpose(transpose(step((transpose(((echo(((X+transpose(echo(((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,4,6) ,4) ) +transpose((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) +transpose((X|X) ,12) ) ,7) ) ,4,6) +transpose(((transpose(arpeggio(X) ,-7) +transpose((echo(X,4,6) |X) ,4) ) +transpose(transpose(step((X+transpose(X,7) ) ,12) ,4) ,7) ) ,7) ) +transpose(transpose(transpose(((X+transpose(X,7) ) +transpose((X|echo(X,4,6) ) ,12) ) ,4) ,-7) ,7) ) ,-7) +transpose(transpose(transpose(shuffle((transpose((((X+transpose(step(X,12) ,4) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) ,-5) +transpose((transpose(X,-7) +transpose(transpose(arpeggio(transpose(X,4) ) ,-5) ,7) ) ,12) ) ) ,-7) ,-7) ,12) ) ,12) ,4) ,12) ) ) +echo((((((arpeggio((shuffle(transpose(arpeggio(step(X,12) ) ,-5) ) +transpose(((echo(arpeggio((((X|X) +transpose(transpose(X,4) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,4,6) +transpose((echo(transpose(transpose(X,-5) ,-5) ,4,6) |transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,-7) ) ,4) ) +transpose((transpose(((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,4) ,12) ) ,7) ) ,7) ) ) |(transpose(transpose(((transpose((X+X) ,-7) +transpose(((arpeggio(arpeggio(X) ) +transpose(step((X+transpose(X,12) ) ,12) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose(transpose(shuffle((X+transpose(X,12) ) ) ,-5) ,7) ) ,-5) ,-5) +(step((arpeggio(transpose(X,-7) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,-7) ,7) ) ,12) |transpose(echo((step(X,12) |X) ,4,6) ,-7) ) ) ) +transpose((transpose((arpeggio(step((X|X) ,12) ) +step(((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ) ,4) +transpose(step((transpose((transpose(transpose((X+X) ,-5) ,-5) +transpose(shuffle(echo(X,4,6) ) ,7) ) ,-5) +step((((X+transpose(X,12) ) +transpose(X,-7) ) +transpose((X+X) ,12) ) ,12) ) ,12) ,7) ) ,7) ) +transpose(shuffle((transpose(transpose(arpeggio(X) ,-5) ,-7) +transpose(transpose(transpose(step(echo(transpose(transpose(X,-7) ,4) ,4,6) ,12) ,-7) ,-7) ,7) ) ) ,12) ) +transpose(echo((step(((transpose((step(X,12) +transpose(transpose(X,-7) ,7) ) ,-7) +transpose(step(shuffle(((echo(transpose(X,-5) ,4,6) +transpose(shuffle(X) ,12) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) ) ,12) ,4) ) +transpose((arpeggio(transpose(X,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,-5) ,12) ) ,7) ) ,12) |(echo(shuffle((X+transpose(transpose(X,-5) ,4) ) ) ,4,6) +(echo(arpeggio(X) ,4,6) |transpose(arpeggio(step(X,12) ) ,-7) ) ) ) ,4,6) ,4) ) +transpose(((transpose(transpose(((transpose((X+transpose(arpeggio(X) ,7) ) ,-5) +step(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) |X) ,12) ) |(transpose((X+transpose(X,12) ) ,-5) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) ) ,-7) ,-7) |arpeggio(arpeggio(transpose(arpeggio((((X+transpose(X,12) ) +transpose(X,7) ) +transpose(transpose(step(echo(X,4,6) ,12) ,-5) ,7) ) ) ,-7) ) ) ) +transpose((transpose(transpose(arpeggio((echo(X,4,6) +transpose(arpeggio(X) ,12) ) ) ,-5) ,-5) +transpose((transpose(transpose((transpose(((X|X) +transpose((X+transpose(X,7) ) ,12) ) ,4) +transpose(step(arpeggio((step(X,12) +transpose(X,12) ) ) ,12) ,7) ) ,-7) ,-7) +transpose(((transpose(transpose(transpose((X+transpose(X,12) ) ,-7) ,-7) ,-7) +transpose(transpose(transpose((((((X|X) +transpose(X,4) ) +transpose((X|X) ,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) ,-5) ,4) ) +transpose(arpeggio(((X+transpose(echo(X,4,6) ,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,7) ) ,7) ) ,7) ) ,7) ) ,7) ) ,4,6) ) +transpose(((echo((((transpose(shuffle((transpose(X,-5) +transpose(((transpose(X,-7) +transpose((((transpose(X,-7) +transpose(shuffle(X) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) ,4) ) +transpose(transpose((X+transpose(arpeggio(X) ,7) ) ,-5) ,7) ) ,7) ) ) ,4) +transpose((transpose(((X+transpose(X,12) ) +transpose(((transpose(X,-5) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) ,7) ) ,-7) |transpose((transpose(echo(arpeggio(((X+transpose(X,7) ) +step(X,12) ) ) ,4,6) ,4) |(transpose(transpose(X,4) ,-5) +transpose(transpose((transpose(X,4) +transpose(step(X,12) ,12) ) ,-7) ,7) ) ) ,-5) ) ,4) ) +transpose(echo(((((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle((X+transpose(X,7) ) ) ,12) ) +transpose((echo(transpose(transpose(shuffle((X|X) ) ,-7) ,-7) ,4,6) +transpose((transpose(arpeggio(transpose(X,-5) ) ,-7) +transpose(transpose(transpose((X+transpose(X,7) ) ,-5) ,-7) ,7) ) ,7) ) ,4) ) +transpose(((((((X+transpose(transpose(X,-5) ,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(((X|X) +(X+X) ) ,4) ) +transpose(step(arpeggio(X) ,12) ,7) ) +transpose((step((X+transpose((X+transpose(X,7) ) ,7) ) ,12) +transpose((transpose(transpose(X,-7) ,-5) +transpose((X+transpose(X,7) ) ,12) ) ,-7) ) ,4) ) +transpose((transpose(X,-7) +echo(step(X,12) ,4,6) ) ,7) ) ,7) ) +transpose(transpose(echo(shuffle(shuffle(X) ) ,4,6) ,-7) ,7) ) +transpose((((shuffle(echo(transpose(X,-5) ,4,6) ) +transpose(transpose(X,-7) ,12) ) +transpose(echo(transpose(X,-5) ,4,6) ,-5) ) +transpose(arpeggio(echo(((X+transpose(X,12) ) +transpose(transpose(X,-7) ,7) ) ,4,6) ) ,12) ) ,4) ) +transpose(transpose(echo(transpose((transpose(X,-7) +transpose(shuffle((X+transpose(shuffle(X) ,7) ) ) ,12) ) ,4) ,4,6) ,-7) ,7) ) ,4,6) ,7) ) +arpeggio(transpose(((echo(transpose(arpeggio((X+transpose(X,12) ) ) ,-5) ,4,6) +(transpose(transpose((transpose(X,-7) +transpose(echo(X,4,6) ,12) ) ,4) ,-5) +((step((X+transpose(X,12) ) ,12) +transpose((X+transpose(X,12) ) ,12) ) +(transpose((transpose(X,4) +transpose(step(X,12) ,12) ) ,-7) +transpose(transpose(arpeggio(echo(X,4,6) ) ,4) ,7) ) ) ) ) |arpeggio(shuffle(echo(step(transpose(transpose(X,-7) ,-5) ,12) ,4,6) ) ) ) ,-5) ) ) ,4,6) +transpose(transpose(echo(step(echo(transpose(transpose(((step(echo(echo((shuffle(X) +transpose(transpose(transpose(X,-7) ,-7) ,12) ) ,4,6) ,4,6) ,12) +transpose(echo((((((X+transpose(X,12) ) +transpose((transpose(X,-5) |(shuffle(X) +transpose(transpose(X,-7) ,7) ) ) ,7) ) |(((((X|X) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) +transpose((arpeggio(X) +transpose((X+X) ,12) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) ) +transpose((transpose(X,-7) +transpose(X,7) ) ,12) ) +transpose(((transpose((transpose(X,-5) +(X+transpose(X,12) ) ) ,-7) |arpeggio((((X+transpose(X,12) ) +transpose(X,12) ) |shuffle((X+transpose(X,7) ) ) ) ) ) +transpose(echo(transpose(transpose(transpose(X,-7) ,4) ,4) ,4,6) ,12) ) ,12) ) ,4,6) ,7) ) +transpose(((transpose(echo(transpose((transpose(X,-7) +transpose(X,7) ) ,-5) ,4,6) ,4) +transpose(transpose(transpose(transpose(transpose(((X+X) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-5) ) ,12) ) ,-5) ,4) ,-7) ,-7) ,4) ) +transpose(arpeggio(transpose(transpose(step(transpose(X,4) ,12) ,-5) ,-5) ) ,7) ) ,12) ) ,-5) ,-5) ,4,6) ,12) ,4,6) ,-5) ,4) ) +transpose(echo(transpose(transpose(transpose((echo(arpeggio((X+transpose(X,12) ) ) ,4,6) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,12) ) ,-7) ,-5) ,4) ,4,6) ,7) ) ,7) ) ,4) ) +transpose((step((transpose(((transpose((step(transpose(X,-5) ,12) +echo(X,4,6) ) ,-5) +transpose(arpeggio(transpose(((X+X) +transpose(X,-5) ) ,-5) ) ,12) ) +transpose(transpose(transpose((transpose(X,-5) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,-5) ,-7) ,7) ) ,4) +transpose(transpose(transpose(shuffle(shuffle((transpose(X,-5) +transpose(transpose(X,-5) ,7) ) ) ) ,-7) ,-7) ,12) ) ,12) +transpose(transpose(((arpeggio(transpose((((echo(X,4,6) +transpose((((X+transpose(X,7) ) |(X+X) ) +transpose((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) +transpose((X+X) ,12) ) ,12) ) ,4) ) +transpose(transpose(echo(transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,-7) ,4,6) ,4) ,7) ) |((step(X,12) +transpose((transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,-5) ,-7) +step(X,12) ) ,4) ) +transpose(step(transpose(X,-5) ,12) ,7) ) ) ,4) ) +transpose(((((((step(X,12) |step(transpose(transpose(X,4) ,-5) ,12) ) +transpose((arpeggio(X) +transpose(step(transpose(X,-7) ,12) ,12) ) ,12) ) +transpose((arpeggio(arpeggio(X) ) +transpose(shuffle(step(X,12) ) ,7) ) ,12) ) +transpose(((((transpose(X,-5) +transpose(X,4) ) +transpose(step(X,12) ,7) ) +transpose(((((echo(X,4,6) +transpose(step(X,12) ,7) ) |step(X,12) ) +transpose(arpeggio((X+X) ) ,4) ) +transpose((transpose(X,4) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X|X) ) ,7) ) ,7) ) ,12) ) +transpose(((X|X) +transpose(arpeggio(step(X,12) ) ,7) ) ,7) ) ,7) ) +transpose(transpose((step(echo(step(arpeggio(echo(echo(((transpose(X,-5) +transpose(step(X,12) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4,6) ,4,6) ) ,12) ,4,6) ,12) +transpose(transpose(step(echo((step(transpose(X,-5) ,12) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,7) ) +transpose(transpose(X,4) ,7) ) ,-5) ) ) ,4,6) ,12) ,4) ,12) ) ,-7) ,4) ) +transpose(echo((transpose(step(echo(echo(X,4,6) ,4,6) ,12) ,-7) +transpose(shuffle(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) ) ) ,7) ) ,4,6) ,7) ) ,4) ) +transpose(shuffle((transpose(arpeggio(transpose(((X+transpose(X,7) ) +transpose(transpose(X,4) ,12) ) ,-5) ) ,-5) +transpose(shuffle(echo(X,4,6) ) ,12) ) ) ,7) ) ,-7) ,7) ) ,7) )
random seed used was 178267762

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