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:
((step(transpose(step(step(arpeggio(step((shuffle(X) +shuffle(X) ) ,12) ) ,12) ,12) ,-7) ,12) |arpeggio(arpeggio((step(transpose(shuffle((transpose((transpose((echo(X,4,6) +transpose(((X+X) +transpose(X,7) ) ,12) ) ,4) +transpose(arpeggio((X+transpose(X,7) ) ) ,4) ) ,-7) |((X+(((shuffle(X) +transpose((X|X) ,7) ) +transpose((transpose(X,4) |X) ,4) ) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ) |echo(((X|X) +transpose(transpose((X|X) ,4) ,12) ) ,4,6) ) ) ) ,4) ,12) |transpose(step(echo((step(transpose(X,4) ,12) +transpose(transpose((shuffle(X) +transpose(X,7) ) ,-5) ,4) ) ,4,6) ,12) ,4) ) ) ) ) |(((((echo((((step(transpose(transpose(shuffle(X) ,4) ,4) ,12) +transpose(((shuffle(X) +transpose(X,12) ) +transpose((((X|X) |(X|X) ) +(X+X) ) ,12) ) ,-5) ) +transpose(echo((echo(transpose(((transpose(X,4) +transpose((transpose(X,4) +transpose((X|X) ,12) ) ,12) ) +transpose(X,-5) ) ,4) ,4,6) |echo(((transpose(transpose(X,4) ,-7) +transpose((transpose(X,4) +transpose(shuffle(X) ,12) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) ) ,4,6) ,4) ) +transpose(transpose(shuffle(arpeggio((X+X) ) ) ,4) ,7) ) ,4,6) +step(shuffle(transpose((echo(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +X) |((X|X) |X) ) ,-5) ,4,6) |(step(transpose((X+transpose(X,12) ) ,-7) ,12) +arpeggio((X|(X+X) ) ) ) ) ,-7) ) ,12) ) +transpose(transpose(arpeggio((echo((arpeggio((transpose(shuffle((X+transpose(X,7) ) ) ,-5) +transpose((transpose((transpose((X|transpose(X,4) ) ,-7) |arpeggio(transpose(X,-7) ) ) ,-7) +transpose((echo((transpose(X,4) |echo(X,4,6) ) ,4,6) |transpose(X,-7) ) ,7) ) ,7) ) ) |(((shuffle(X) +(X|transpose(step(X,12) ,-7) ) ) +shuffle((X+transpose((((X+X) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ) ) +((((X+transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) +transpose((X+transpose(((X+transpose(X,4) ) +transpose((X|X) ,7) ) ,12) ) ,-7) ) +transpose(transpose(echo(transpose(transpose(X,4) ,-5) ,4,6) ,4) ,12) ) ) ) ,4,6) |transpose(((transpose((transpose(transpose(((X+transpose(X,7) ) |(echo(X,4,6) |X) ) ,-7) ,4) +transpose((transpose(echo(X,4,6) ,4) +((X+transpose(X,12) ) +transpose(transpose(X,-7) ,12) ) ) ,-5) ) ,-5) +transpose((transpose(((transpose((((transpose(X,-5) +X) +transpose(transpose(X,-5) ,4) ) +transpose(((step(X,12) +transpose(shuffle(X) ,4) ) +transpose((X|X) ,7) ) ,7) ) ,4) +(((((X+transpose(X,4) ) +transpose(X,7) ) |echo(X,4,6) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ) +transpose(step((transpose(X,4) +transpose(X,12) ) ,12) ,7) ) ) +(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(step((X+((X+X) +transpose((X+transpose(X,7) ) ,7) ) ) ,12) ,7) ) ) ,-7) |(((transpose(echo((((transpose(X,4) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose((X+X) ,7) ) ,4,6) ,4) +transpose((arpeggio(transpose(transpose(transpose(X,-5) ,4) ,-5) ) +(transpose(transpose(X,-7) ,-7) +transpose(transpose(transpose(X,-7) ,-5) ,12) ) ) ,4) ) +transpose(transpose(arpeggio(transpose((X+(X+X) ) ,-7) ) ,4) ,7) ) |echo(transpose((X+transpose(X,12) ) ,-5) ,4,6) ) ) ,4) ) +transpose(transpose(echo(((X+((X+transpose(X,7) ) |X) ) +transpose(step(X,12) ,-7) ) ,4,6) ,4) ,7) ) ,-5) ) ) ,-5) ,12) ) +transpose((step(((transpose(arpeggio((step(transpose((shuffle(X) +echo(((X+transpose(X,12) ) +transpose(transpose((X|X) ,-7) ,7) ) ,4,6) ) ,4) ,12) +transpose(transpose((arpeggio((X|X) ) +transpose(X,12) ) ,-5) ,7) ) ) ,4) +transpose(transpose((((transpose(step(X,12) ,-5) +transpose((((shuffle(echo(X,4,6) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(((transpose(X,4) +transpose(arpeggio(X) ,7) ) +transpose(X,7) ) ,4) ) +transpose(transpose(((X+transpose(X,12) ) +X) ,-7) ,7) ) ,7) ) +transpose(echo(((((X+transpose(X,12) ) +transpose(X,12) ) |X) |(((X+transpose(transpose(X,-5) ,12) ) |arpeggio(transpose(X,4) ) ) |transpose(((X+X) +X) ,-5) ) ) ,4,6) ,12) ) +arpeggio(arpeggio(transpose(transpose(echo(shuffle((transpose(X,4) +transpose(transpose(X,4) ,12) ) ) ,4,6) ,4) ,-5) ) ) ) ,-7) ,4) ) +transpose(step(transpose(transpose((echo(transpose((X+transpose(X,7) ) ,4) ,4,6) +transpose(transpose(transpose(X,4) ,4) ,7) ) ,4) ,4) ,12) ,7) ) ,12) +((((((transpose(((transpose(echo(transpose(shuffle(((X+X) |arpeggio(X) ) ) ,4) ,4,6) ,-5) +transpose(step((((X+transpose(X,4) ) +transpose(X,7) ) +(X|transpose(X,4) ) ) ,12) ,4) ) +transpose(((arpeggio((X+transpose(X,7) ) ) +transpose((X+X) ,4) ) +transpose(X,7) ) ,7) ) ,-5) |((transpose(step(((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ,-5) |transpose(transpose(X,-7) ,4) ) +transpose(((step(X,12) |echo(transpose(X,-7) ,4,6) ) |transpose(transpose(X,-5) ,4) ) ,7) ) ) +arpeggio(((transpose(X,4) +(X|(X+transpose(X,12) ) ) ) +transpose(transpose(transpose(transpose(((X+transpose(transpose(X,4) ,4) ) +transpose(arpeggio(X) ,7) ) ,4) ,4) ,-7) ,7) ) ) ) +transpose((echo(step((arpeggio((X|X) ) +transpose(((transpose((((X+transpose(X,4) ) +transpose((X+X) ,7) ) |arpeggio(arpeggio(X) ) ) ,4) +transpose(transpose((echo(shuffle(X) ,4,6) +transpose(X,-5) ) ,-7) ,4) ) +transpose(transpose((X+X) ,4) ,7) ) ,7) ) ,12) ,4,6) +(transpose((((transpose((X+transpose(X,12) ) ,-5) +transpose(transpose(X,4) ,12) ) |transpose(echo(X,4,6) ,4) ) +transpose(transpose(step(transpose(X,-5) ,12) ,-7) ,-7) ) ,-5) +((transpose(X,-5) +transpose(((transpose(X,-5) |step(transpose(X,-5) ,12) ) |transpose((shuffle(X) |transpose(X,-5) ) ,-7) ) ,12) ) +step(((transpose(transpose((X+transpose(X,12) ) ,-7) ,4) +transpose((transpose((X+transpose(X,7) ) ,-5) +transpose(X,12) ) ,4) ) +transpose((((transpose((X|X) ,4) +transpose(echo(X,4,6) ,7) ) +transpose(X,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ,7) ) ,12) ) ) ) ,4) ) +transpose(transpose(transpose(arpeggio(echo((transpose(transpose((X+X) ,-7) ,-5) +transpose(transpose(X,-7) ,-5) ) ,4,6) ) ,-5) ,4) ,7) ) +(transpose((transpose(arpeggio(X) ,4) +transpose((X|X) ,7) ) ,-5) +transpose(((transpose(transpose(transpose(X,-5) ,-5) ,-7) +transpose(transpose((((X+transpose(X,12) ) +X) +transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,7) ) ,4) ,4) ) +transpose(transpose(arpeggio(step(X,12) ) ,4) ,7) ) ,7) ) ) +transpose(transpose(step(((((((shuffle(X) +transpose((X+transpose(X,7) ) ,12) ) +transpose(((transpose(transpose(arpeggio(X) ,-7) ,4) +transpose(((X+X) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) ,4) ) +transpose(((transpose(arpeggio(transpose(X,-5) ) ,-7) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose((transpose(X,-7) +transpose(X,12) ) ,-7) ,7) ) ,7) ) ,7) ) +arpeggio((((((X+X) +arpeggio(X) ) +transpose((transpose(X,-5) |(X|X) ) ,4) ) +transpose(shuffle(shuffle(X) ) ,7) ) +((X+transpose(X,12) ) |X) ) ) ) +((transpose(transpose((X+X) ,-5) ,-7) +transpose((X+X) ,12) ) +transpose((transpose(X,4) +(X|X) ) ,7) ) ) +transpose((step(transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(transpose(X,-7) ,4) ,12) ) ) ,-5) ,12) |((arpeggio(((X+transpose((((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) |transpose(X,4) ) ,4) ) +transpose((transpose(X,4) |shuffle(echo(X,4,6) ) ) ,7) ) ) +transpose((((transpose(transpose(X,-5) ,4) +transpose(transpose((X|echo((X|X) ,4,6) ) ,4) ,7) ) +transpose(((((X+transpose((X+transpose(X,7) ) ,7) ) +transpose((X|X) ,4) ) +transpose((X|X) ,7) ) |((X|X) +(X|X) ) ) ,12) ) +transpose(shuffle(transpose(X,-7) ) ,12) ) ,4) ) +transpose((shuffle((echo(transpose(X,-7) ,4,6) |transpose(X,4) ) ) |step(transpose((transpose(arpeggio(X) ,-5) |X) ,-7) ,12) ) ,7) ) ) ,4) ) +transpose((transpose((step(((((X+X) +transpose(X,12) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,4) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) ,12) +transpose((transpose(X,-5) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,4) |((((((transpose((arpeggio(X) +transpose(X,12) ) ,-7) |echo(X,4,6) ) +transpose((transpose((echo(X,4,6) |X) ,4) |(transpose(X,4) +X) ) ,4) ) +transpose(shuffle((step(X,12) +transpose(X,7) ) ) ,7) ) +arpeggio((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +(X+X) ) ) ) +transpose((step((transpose(X,-5) +transpose((X+X) ,12) ) ,12) |transpose(shuffle(echo(X,4,6) ) ,-5) ) ,4) ) +transpose((((((X+transpose(X,7) ) +transpose(transpose(X,4) ,7) ) +transpose(transpose((X|transpose(X,-5) ) ,4) ,7) ) +transpose((((X+transpose(transpose(X,-7) ,4) ) +transpose((X|transpose(X,-7) ) ,7) ) +transpose(step(X,12) ,-5) ) ,12) ) +transpose(transpose(((transpose(X,4) |X) +X) ,4) ,7) ) ,7) ) ) ,7) ) ,12) ,-7) ,12) ) ) ,4) ) +transpose(step(transpose(((((((X|X) +X) +(((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(X,-7) ) +transpose(transpose(transpose(transpose((X|X) ,4) ,-5) ,4) ,7) ) ) |(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) |arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +(X+transpose(X,7) ) ) ) ) ) |(transpose(step(X,12) ,-7) |((((((X+transpose(X,12) ) +transpose((X|X) ,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,12) ) +transpose(X,4) ) +transpose(transpose(arpeggio((X+transpose(X,12) ) ) ,4) ,7) ) ) ) +transpose((shuffle(transpose(((((((X+((X+transpose(X,4) ) +transpose(X,7) ) ) +(X+(X+transpose(X,12) ) ) ) |(((X+transpose((X|X) ,4) ) +transpose(X,7) ) +transpose(((X|X) +transpose(X,12) ) ,12) ) ) +transpose(step(X,12) ,4) ) +transpose(step(echo(((echo(transpose(X,-5) ,4,6) +transpose(step((X+X) ,12) ,4) ) +transpose(((X|X) |X) ,7) ) ,4,6) ,12) ,4) ) +transpose(((shuffle((X|X) ) +transpose((transpose((X+transpose(X,12) ) ,4) +transpose(transpose(X,-7) ,12) ) ,4) ) +transpose((((X+transpose(X,12) ) +X) +transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,12) ) ,7) ) ,7) ) ,4) ) +transpose((((arpeggio(transpose((transpose((X+transpose(X,12) ) ,4) +transpose(X,12) ) ,4) ) +transpose(transpose(transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ,-7) ,4) ) +transpose(transpose(((echo(transpose(X,-5) ,4,6) +transpose(((echo(X,4,6) |(X+transpose(X,7) ) ) +transpose(X,7) ) ,4) ) +transpose((X+step((X+transpose(X,12) ) ,12) ) ,7) ) ,4) ,7) ) +transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |X) +(((X+transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,4) ,12) ) ,12) ) ,7) ) ,-5) ,12) ,7) ) +transpose(((transpose(transpose(transpose((((transpose((transpose((X|X) ,4) |(X+transpose(transpose(X,-5) ,12) ) ) ,4) |(X+(((X+X) |X) +transpose(((X+transpose(X,12) ) +X) ,7) ) ) ) |((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +((step(transpose((X+transpose(X,12) ) ,-7) ,12) +transpose(transpose((transpose(X,4) |(X+transpose(X,7) ) ) ,-7) ,4) ) +transpose(shuffle(X) ,7) ) ) +transpose((transpose(X,-5) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X|arpeggio(X) ) ) ,7) ) ,4) ) ) |echo((transpose(transpose(echo(X,4,6) ,4) ,-7) |((transpose(echo(transpose(X,4) ,4,6) ,-7) +transpose((X+arpeggio(X) ) ,4) ) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ) ,4,6) ) ,-5) ,-5) ,-5) |transpose(step(transpose((echo(((((((X+(X+transpose(X,12) ) ) +transpose(step(X,12) ,7) ) +transpose(transpose(arpeggio((X+transpose(X,7) ) ) ,4) ,12) ) +transpose(((((X+X) +transpose((X+transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) ,12) ) +transpose(step((X+transpose(X,7) ) ,12) ,4) ) +transpose(((step(((X+transpose(X,7) ) |X) ,12) +transpose((X+X) ,4) ) +transpose((transpose((X+transpose(X,12) ) ,-7) +transpose(shuffle(transpose(X,4) ) ,12) ) ,7) ) ,7) ) ,4) ) +transpose(echo((transpose((X+X) ,4) |shuffle((X+X) ) ) ,4,6) ,7) ) |(((shuffle(X) +transpose((transpose(X,4) +(X+transpose(X,12) ) ) ,12) ) |((X|(X+transpose(transpose(X,4) ,7) ) ) +transpose(((transpose((arpeggio(X) |(X+transpose(X,7) ) ) ,-5) +transpose(transpose(arpeggio(X) ,-7) ,4) ) +transpose(shuffle((transpose(X,-5) +transpose(transpose(X,4) ,7) ) ) ,7) ) ,7) ) ) +((transpose(X,4) +arpeggio((X+transpose(X,12) ) ) ) +transpose(echo(transpose(X,-7) ,4,6) ,12) ) ) ) ,4,6) |transpose(transpose((transpose(transpose(transpose(X,-5) ,-5) ,-7) |step(transpose(step(transpose(transpose(X,-5) ,-7) ,12) ,4) ,12) ) ,-7) ,-7) ) ,-7) ,12) ,-7) ) |(step(arpeggio(((((step((step(transpose(transpose(X,4) ,-7) ,12) |transpose((transpose((X+transpose(X,7) ) ,4) +step(transpose(X,-7) ,12) ) ,4) ) ,12) +arpeggio(echo((echo(transpose(echo(echo(X,4,6) ,4,6) ,-7) ,4,6) +(shuffle(transpose(step(X,12) ,4) ) +transpose((transpose(((transpose(X,-5) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,-7) +transpose(echo(step(X,12) ,4,6) ,7) ) ,12) ) ) ,4,6) ) ) +transpose(shuffle((transpose(transpose(X,4) ,-5) |((((transpose(transpose((X+X) ,-7) ,4) |transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,12) ) |((step(X,12) +transpose(transpose(X,-7) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,-7) ) +transpose((transpose(transpose(X,-7) ,-5) +transpose(X,-7) ) ,-7) ) +transpose(((((X|X) +X) +transpose(echo(shuffle(((X+transpose(X,7) ) +shuffle((X|X) ) ) ) ,4,6) ,4) ) +transpose(transpose((transpose(X,4) +transpose((echo(transpose(X,-7) ,4,6) +(X|((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,12) ) ,-5) ,7) ) ,4) ) +transpose(((arpeggio((transpose(X,-7) +X) ) +transpose((((X|X) +transpose(shuffle((X+X) ) ,12) ) +(X|X) ) ,12) ) +transpose(shuffle((transpose((X+transpose(X,7) ) ,4) +(step((X+transpose(X,7) ) ,12) +transpose((arpeggio(X) +(X+transpose(X,7) ) ) ,12) ) ) ) ,7) ) ,7) ) ) ) ,7) ) +transpose(((transpose((step((step(transpose(X,4) ,12) |transpose((arpeggio(transpose(X,4) ) +transpose(step(X,12) ,7) ) ,-7) ) ,12) +step(transpose(((transpose(X,4) |step(X,12) ) +transpose(arpeggio(X) ,7) ) ,-7) ,12) ) ,-7) |echo(transpose(transpose((transpose(transpose(shuffle(X) ,-7) ,-5) +transpose((transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,4) +transpose(transpose(X,-5) ,-7) ) ,7) ) ,-7) ,-5) ,4,6) ) |shuffle(((((transpose(transpose(transpose(X,-5) ,-5) ,-7) +transpose(transpose(arpeggio(X) ,-5) ,12) ) +transpose(((echo((step(X,12) +X) ,4,6) +transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(transpose((X|X) ,4) ,7) ) ,4) ) ,4) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) +transpose(((transpose(transpose(transpose((X|X) ,-5) ,-5) ,-5) +((transpose(X,-7) +transpose(arpeggio(transpose(X,4) ) ,12) ) +transpose(transpose(X,-7) ,12) ) ) +transpose((transpose((X+X) ,4) +transpose(shuffle(transpose(X,-7) ) ,-7) ) ,7) ) ,12) ) ) ) ,4) ) +transpose((transpose(transpose(((((transpose(X,4) +transpose(transpose(X,-7) ,12) ) +(shuffle(X) +transpose(echo(X,4,6) ,4) ) ) +shuffle(echo(X,4,6) ) ) +X) ,4) ,4) +((shuffle(transpose(transpose(transpose((X+transpose(X,12) ) ,-7) ,-5) ,4) ) +transpose(shuffle(step((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) |((transpose(X,-5) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,12) ) ,7) ) +transpose(echo(step(transpose((transpose((transpose((X|X) ,4) |transpose(transpose(X,4) ,4) ) ,4) +(transpose(X,-5) +(X+transpose((X+X) ,12) ) ) ) ,-5) ,12) ,4,6) ,7) ) ) ,7) ) ) ,12) +(transpose(transpose(transpose(echo(arpeggio(step(transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) +transpose(transpose(X,-7) ,7) ) +((((X+transpose(X,4) ) +transpose(X,7) ) |X) +X) ) ,-7) ,12) ) ,4,6) ,-7) ,4) ,-5) +transpose((((((((X|(X+transpose((X|X) ,12) ) ) +transpose(((X+X) +transpose(((arpeggio(X) +transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) +transpose((echo(X,4,6) |((transpose(X,-7) +transpose((X|X) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,12) ) +transpose(shuffle(transpose(X,-7) ) ,-7) ) +transpose(shuffle(((step(transpose(X,4) ,12) +transpose((transpose(echo(arpeggio(X) ,4,6) ,-5) +transpose(transpose(X,-5) ,7) ) ,-5) ) +transpose(((step(step(transpose(X,-7) ,12) ,12) +transpose(((((transpose(X,-5) +(X+transpose(X,7) ) ) +(echo(X,4,6) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ) ) +transpose(transpose(step(X,12) ,4) ,4) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ,4) ) +transpose(step(transpose(transpose((X|X) ,-5) ,-7) ,12) ,7) ) ,12) ) ) ,7) ) +step(step(transpose(((arpeggio(((((X+transpose(X,12) ) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-5) ,7) ) |echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ) +transpose(transpose(((((transpose(X,-7) +X) +transpose(transpose(X,-7) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) |(X+transpose(X,-7) ) ) ,-7) ,4) ) +transpose((transpose(X,-7) +((transpose(shuffle(X) ,-5) +transpose(shuffle((X|X) ) ,4) ) +transpose(transpose(arpeggio((X+X) ) ,-5) ,7) ) ) ,7) ) ,-5) ,12) ,12) ) ,-5) ) ) ) ,-7) ) )
random seed used was 236953422

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