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((((((echo(((transpose(step(echo(transpose(X,-7) ,4,6) ,12) ,-7) +transpose((step(step((transpose(arpeggio(transpose(echo(X,4,6) ,-7) ) ,4) |echo((X|transpose(X,-5) ) ,4,6) ) ,12) ,12) +arpeggio((((transpose(((transpose(X,-7) +transpose(transpose(X,4) ,12) ) +transpose((arpeggio(X) +transpose((X+transpose(X,7) ) ,12) ) ,12) ) ,-5) +transpose((transpose(X,-7) |transpose(X,-7) ) ,7) ) +transpose((transpose(((arpeggio(X) +transpose(((X+X) |X) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) +((transpose(X,4) +transpose(((X+transpose(X,12) ) |transpose(X,-7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,7) ) +transpose((transpose(((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) |(X+(((X+shuffle(X) ) |transpose(X,-5) ) +transpose(((X+transpose(step((X|X) ,12) ,4) ) +transpose(shuffle((X+X) ) ,7) ) ,12) ) ) ) ,7) ) ) ) ,4) ) +transpose(((shuffle(transpose((X|X) ,4) ) |(((X|((X+transpose(X,4) ) +transpose(X,7) ) ) +step(X,12) ) +transpose(((((arpeggio(transpose(X,-5) ) +transpose(step(transpose(X,4) ,12) ,4) ) +transpose((shuffle(X) |step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) +transpose(step((X|X) ,12) ,4) ) +transpose(arpeggio(X) ,7) ) ,12) ) ) +transpose((transpose((transpose(X,-5) +transpose((X|X) ,4) ) ,4) +transpose(arpeggio(step(transpose((X+transpose(X,7) ) ,4) ,12) ) ,12) ) ,7) ) ,7) ) ,4,6) |transpose(echo(((echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,4,6) +transpose((transpose(((((shuffle(X) |X) +(X|X) ) +transpose(shuffle(transpose(X,4) ) ,4) ) +transpose(((shuffle(X) |(X+X) ) +step((X+transpose(X,12) ) ,12) ) ,7) ) ,-5) |transpose(echo((((X|X) |shuffle(X) ) +transpose((echo(echo(X,4,6) ,4,6) +transpose(transpose(shuffle(X) ,-5) ,12) ) ,7) ) ,4,6) ,-7) ) ,12) ) +(transpose(transpose(echo(arpeggio(X) ,4,6) ,-7) ,-5) +transpose(transpose((transpose(transpose(X,-5) ,4) +transpose((X+transpose(X,12) ) ,12) ) ,4) ,7) ) ) ,4,6) ,-7) ) +arpeggio((transpose(step(transpose(((transpose(X,-5) |transpose(transpose(X,-7) ,-5) ) |(((X+transpose(shuffle(X) ,12) ) +transpose(((echo(X,4,6) +transpose((X|X) ,7) ) +transpose(X,7) ) ,4) ) +transpose((shuffle(X) |X) ,7) ) ) ,-7) ,12) ,-5) +transpose(echo(arpeggio(arpeggio(arpeggio(X) ) ) ,4,6) ,12) ) ) ) +transpose(transpose(step((((shuffle(transpose(transpose(shuffle(arpeggio((X+transpose(X,7) ) ) ) ,4) ,4) ) +step(((step(X,12) |X) +(X+X) ) ,12) ) +transpose(((((((transpose((X+X) ,-7) |transpose(shuffle(transpose(X,-5) ) ,-7) ) +shuffle(transpose(transpose(X,-7) ,4) ) ) +((arpeggio(X) +transpose(transpose(transpose(X,4) ,-5) ,7) ) |step(X,12) ) ) +transpose(((transpose((X+X) ,-7) +(transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) +transpose(((transpose((X|X) ,4) +transpose((X|X) ,4) ) +transpose((X+transpose(transpose(X,-7) ,7) ) ,7) ) ,7) ) ) |(transpose(X,-5) |echo(X,4,6) ) ) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) |(transpose((X|X) ,4) +transpose(transpose((((transpose(X,-7) |X) +step(X,12) ) +transpose(echo((X+X) ,4,6) ,7) ) ,-7) ,12) ) ) ,-7) ) |((((arpeggio(transpose((arpeggio(X) |echo(X,4,6) ) ,-5) ) +transpose(step(((((X+transpose(shuffle(X) ,12) ) +transpose((step(X,12) +step((X+transpose(X,12) ) ,12) ) ,4) ) +transpose((transpose(X,4) +transpose(transpose(X,-5) ,12) ) ,7) ) |(transpose(transpose((X+transpose(X,12) ) ,-7) ,-5) |(((X|X) +transpose(arpeggio((X+transpose(X,12) ) ) ,4) ) +transpose((arpeggio(transpose(X,-7) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ) ) ,12) ,12) ) +transpose(((((((X|X) +transpose((X+transpose((X|X) ,7) ) ,12) ) +transpose(shuffle(step((X|X) ,12) ) ,12) ) +transpose((step(((X+transpose(X,7) ) +transpose(step(X,12) ,7) ) ,12) +transpose(transpose((((X+X) +transpose((X+X) ,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) ,4) ,7) ) ,7) ) +((transpose(((X+transpose(echo(X,4,6) ,4) ) +transpose((X|X) ,7) ) ,-5) +transpose((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(step((X|X) ,12) ,-5) ) ,4) ) +transpose(echo((echo(X,4,6) +transpose(X,-7) ) ,4,6) ,7) ) ) +transpose(arpeggio(transpose(arpeggio(X) ,-7) ) ,7) ) ,4) ) +transpose(((echo((((X+X) +transpose(X,7) ) +transpose((X+X) ,12) ) ,4,6) +step(((((X+transpose(X,4) ) +transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) +(arpeggio(X) |(transpose(X,4) +transpose(echo(X,4,6) ,7) ) ) ) ,12) ) +transpose(((step((((X|X) +transpose((X+transpose(X,12) ) ,7) ) +X) ,12) +transpose(((transpose(transpose(X,-5) ,-5) +X) +transpose(step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) ,7) ) ,4) ) +transpose((echo((X+transpose(X,12) ) ,4,6) +(shuffle(X) |arpeggio(X) ) ) ,7) ) ,12) ) ,7) ) |((((shuffle(((X+(X+transpose(X,7) ) ) +transpose(transpose(step((X|X) ,12) ,-5) ,7) ) ) +transpose(arpeggio(((X+transpose(X,12) ) +(arpeggio(X) |X) ) ) ,12) ) |(arpeggio(step(((X+X) +transpose(X,4) ) ,12) ) +echo((transpose((X+transpose(X,12) ) ,-7) |transpose(X,-5) ) ,4,6) ) ) |arpeggio(step(X,12) ) ) |echo(transpose((transpose((transpose(((X+X) +transpose(arpeggio(X) ,12) ) ,-7) |transpose(transpose(X,4) ,-7) ) ,-7) +transpose((((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) +transpose((X|(X+X) ) ,4) ) +transpose((transpose(X,4) |X) ,7) ) +arpeggio(X) ) ,12) ) ,-7) ,4,6) ) ) ) ,12) ,-5) ,4) ) +transpose(((transpose((arpeggio(shuffle(((arpeggio(((X+X) +transpose((X+X) ,7) ) ) +transpose((X+transpose((transpose(X,-5) +X) ,12) ) ,4) ) +transpose(((((X+transpose(X,7) ) +transpose((X+X) ,4) ) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) +transpose(step(shuffle(X) ,12) ,12) ) ,7) ) ) ) +((shuffle(transpose(echo((X|X) ,4,6) ,-5) ) +shuffle(((X+X) +transpose(X,12) ) ) ) |arpeggio((step(transpose(((X+X) +transpose(X,7) ) ,-7) ,12) +transpose(((X+transpose(X,12) ) |((X+transpose(X,12) ) +X) ) ,4) ) ) ) ) ,4) +transpose(transpose((arpeggio((((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(transpose(X,4) ,7) ) ) +transpose(transpose(transpose(arpeggio(X) ,-5) ,-7) ,4) ) +transpose(((transpose(transpose((X+X) ,-7) ,-5) |(transpose((X+transpose(X,12) ) ,4) |(step(step(X,12) ,12) |transpose(X,-5) ) ) ) |(transpose(step(X,12) ,-7) +transpose(transpose(shuffle(X) ,-7) ,7) ) ) ,7) ) ) +shuffle(shuffle(arpeggio(shuffle(transpose(echo(step(X,12) ,4,6) ,-7) ) ) ) ) ) ,-5) ,4) ) +transpose(transpose((echo((((transpose(transpose((transpose(X,-5) |shuffle(echo(X,4,6) ) ) ,-7) ,-5) +transpose((step((X+transpose(X,12) ) ,12) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(echo((transpose(transpose(arpeggio(X) ,4) ,-7) +transpose((arpeggio(X) |(X|X) ) ,7) ) ,4,6) ,7) ) +transpose((((X+X) |X) +transpose(step(step(X,12) ,12) ,12) ) ,12) ) ,4,6) +transpose(((transpose((transpose(X,-7) +step(X,12) ) ,-7) +transpose(shuffle(X) ,-5) ) |(((transpose(((X+transpose(X,7) ) |(X|X) ) ,4) +arpeggio(((X+transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ) +(step(((X+X) |shuffle(X) ) ,12) +transpose(shuffle(X) ,12) ) ) +((X+transpose((X+transpose(X,12) ) ,12) ) |shuffle(((X+transpose(X,7) ) +transpose((X+X) ,7) ) ) ) ) ) ,7) ) ,4) ,7) ) ,7) ) +shuffle(step((echo(transpose(step((shuffle(arpeggio(step(X,12) ) ) +transpose((X|X) ,12) ) ,12) ,4) ,4,6) +transpose(((transpose(((echo((transpose(transpose(X,-5) ,-5) +transpose((transpose(shuffle(X) ,4) |(X+transpose(X,12) ) ) ,12) ) ,4,6) +transpose(transpose(transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,4) ,-5) ,7) ) |step(step(shuffle(transpose((arpeggio(X) +X) ,-5) ) ,12) ,12) ) ,4) |shuffle(shuffle(step(transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X|X) ) ,4) ,4) ,12) ) ) ) +arpeggio(transpose((echo(arpeggio(((X+X) |echo(X,4,6) ) ) ,4,6) +(((echo(transpose(transpose((X+X) ,-7) ,4) ,4,6) |transpose(step(X,12) ,4) ) +transpose(transpose(((X+transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) ,-7) ,4) ) +transpose(shuffle((transpose(((X|X) +transpose(X,12) ) ,4) +transpose((X+X) ,4) ) ) ,7) ) ) ,-7) ) ) ,12) ) ,12) ) ) ) |((arpeggio(shuffle((((step((echo(shuffle(transpose(transpose((arpeggio(X) |transpose(X,4) ) ,-5) ,-7) ) ,4,6) |step(transpose(transpose(echo(step(X,12) ,4,6) ,-7) ,4) ,12) ) ,12) |echo((step((arpeggio(X) +transpose(transpose((transpose(X,-5) +transpose(shuffle(X) ,7) ) ,-5) ,12) ) ,12) +transpose((transpose((transpose((X|X) ,-7) |step((X+transpose((X+transpose(X,7) ) ,12) ) ,12) ) ,-7) |((X+transpose(X,12) ) +transpose(echo(step(X,12) ,4,6) ,12) ) ) ,7) ) ,4,6) ) +((echo(step((X+transpose(X,7) ) ,12) ,4,6) +transpose(((transpose(arpeggio(transpose(X,4) ) ,4) +transpose(transpose(step((transpose(X,4) +transpose(X,7) ) ,12) ,4) ,7) ) |((X+transpose((X+X) ,7) ) +transpose(transpose(X,-7) ,7) ) ) ,12) ) +transpose((arpeggio(shuffle(transpose(arpeggio((transpose(X,-7) |transpose(X,4) ) ) ,-5) ) ) |transpose(((transpose((X+transpose(X,7) ) ,-5) +transpose(((X+transpose(X,12) ) +transpose(transpose(X,-5) ,12) ) ,12) ) |(transpose(arpeggio(transpose(transpose(X,-7) ,-5) ) ,-7) +transpose(echo(transpose(X,4) ,4,6) ,4) ) ) ,-7) ) ,7) ) ) +transpose((transpose(transpose(shuffle(shuffle(((((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) +transpose(echo(transpose(X,-5) ,4,6) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ) ) ,4) ,4) +transpose(((transpose((((((X+transpose(X,7) ) +step(shuffle(X) ,12) ) |transpose(step(X,12) ,4) ) +transpose(X,7) ) +transpose(transpose(transpose(((transpose(X,-7) +transpose(transpose(X,-7) ,7) ) +((X+X) +transpose(transpose(X,-5) ,12) ) ) ,4) ,4) ,12) ) ,-5) |shuffle(arpeggio(transpose(X,-7) ) ) ) +transpose((transpose((shuffle((echo(shuffle(X) ,4,6) +transpose(transpose(step(transpose(X,-5) ,12) ,4) ,12) ) ) +transpose(((X+(X+(transpose(X,-5) +transpose(X,12) ) ) ) +transpose(transpose(shuffle((echo(X,4,6) +transpose(X,4) ) ) ,-7) ,12) ) ,7) ) ,4) |transpose(arpeggio(echo(arpeggio(transpose(X,-7) ) ,4,6) ) ,-7) ) ,12) ) ,4) ) ,-5) ) ) ) +transpose((((shuffle(step(transpose(echo(((step(transpose(X,4) ,12) +transpose(transpose(shuffle((transpose(X,-5) |((transpose(X,-5) +transpose(transpose(X,-5) ,12) ) +X) ) ) ,-5) ,12) ) +transpose(transpose(arpeggio(step((X|X) ,12) ) ,-5) ,12) ) ,4,6) ,4) ,12) ) |transpose(transpose((((((transpose(transpose(shuffle(X) ,-5) ,4) +transpose(shuffle((step(X,12) +transpose(((X+X) +transpose(X,12) ) ,7) ) ) ,12) ) +transpose((shuffle((X|X) ) +((shuffle(((X+transpose(X,12) ) +X) ) +transpose((X+X) ,4) ) +transpose(((transpose(X,-5) +transpose((transpose(X,-7) +shuffle(X) ) ,4) ) +transpose(X,7) ) ,7) ) ) ,4) ) +transpose(((shuffle(echo((X|X) ,4,6) ) +transpose(transpose(((X+X) +transpose(X,-5) ) ,4) ,12) ) +transpose((((X+X) +transpose((X|X) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) ,7) ) +transpose(shuffle((echo(transpose(X,-5) ,4,6) |transpose(((step(X,12) +X) +transpose(transpose(X,-7) ,12) ) ,4) ) ) ,7) ) |transpose((((((((transpose(X,4) +X) +transpose(arpeggio(transpose(X,-7) ) ,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) +transpose(echo(shuffle(shuffle(X) ) ,4,6) ,12) ) |((shuffle(X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ) +transpose(((transpose((echo(transpose(X,-5) ,4,6) |step(X,12) ) ,-7) +transpose(transpose(transpose((X|X) ,-5) ,-7) ,4) ) +transpose(step(transpose(X,-7) ,12) ,7) ) ,4) ) +transpose(echo(transpose(step(transpose((X+transpose(X,7) ) ,-7) ,12) ,4) ,4,6) ,7) ) ,4) ) ,-7) ,4) ) +transpose((transpose(transpose(((shuffle(((transpose((X+X) ,4) |(((X+transpose(X,4) ) +transpose(X,7) ) +(X+transpose(X,12) ) ) ) +transpose(X,-5) ) ) |transpose(transpose(transpose(transpose(X,4) ,-7) ,4) ,-5) ) +(arpeggio(arpeggio((step(transpose((X+X) ,-7) ,12) |(((X+transpose(X,7) ) +transpose(transpose(step(X,12) ,4) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ) ) |shuffle(transpose((((transpose(X,-7) +transpose(X,4) ) +transpose((echo(X,4,6) +transpose(X,7) ) ,4) ) +transpose(transpose(arpeggio(echo((X+X) ,4,6) ) ,-7) ,7) ) ,-7) ) ) ) ,-7) ,-5) +transpose((step(transpose(((((transpose((((X|X) |(X+transpose(X,12) ) ) +transpose(arpeggio(transpose(X,4) ) ,4) ) ,4) +transpose(transpose(transpose(((echo(X,4,6) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,4) ,-7) ,4) ) +transpose(((echo(X,4,6) +X) +transpose(step(transpose((X+X) ,-5) ,12) ,7) ) ,7) ) +transpose((transpose((((X+transpose(transpose(X,-5) ,12) ) +transpose(X,7) ) |(transpose(X,-5) +transpose(X,-7) ) ) ,-7) +transpose((transpose((X+X) ,4) +transpose((((X+transpose(X,7) ) +transpose(X,7) ) +((transpose(transpose(X,-5) ,-5) +transpose((X+X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,12) ) ,7) ) ,4) ) +transpose(transpose(echo((X+transpose(X,12) ) ,4,6) ,-7) ,7) ) ,-5) ,12) |(((transpose(((arpeggio(transpose((X+transpose(X,-5) ) ,4) ) +((transpose(X,4) +transpose((X+transpose((X+X) ,7) ) ,7) ) +transpose(((X+echo(transpose(X,-7) ,4,6) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,-5) ) ,7) ) ) +echo((((X|X) |transpose(transpose((X|X) ,-5) ,-7) ) +transpose((transpose(X,-7) +X) ,7) ) ,4,6) ) ,4) +(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(echo(X,4,6) ,-7) ,4) ) +transpose(X,7) ) ,-5) +transpose((step((((transpose(X,4) +transpose(transpose(X,-5) ,4) ) +transpose((X|X) ,7) ) +transpose(transpose((X|X) ,-7) ,12) ) ,12) +transpose(transpose(transpose((X+X) ,4) ,-5) ,7) ) ,12) ) ) +transpose(step(((transpose((((X+X) |transpose(X,-5) ) +transpose((step(X,12) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,4) +transpose(step((X|echo(X,4,6) ) ,12) ,7) ) +transpose((arpeggio((X+transpose(X,12) ) ) |((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ) ,-7) ) ,12) ,7) ) +transpose((echo(arpeggio(((transpose(transpose(X,4) ,-7) +transpose((X+transpose(X,12) ) ,12) ) +(transpose(X,4) +X) ) ) ,4,6) +transpose(transpose(X,-5) ,-7) ) ,12) ) ) ,12) ) ,4) ) +transpose(echo(transpose(transpose(transpose((transpose((X|X) ,-7) +echo((transpose((X+transpose(X,12) ) ,-7) |X) ,4,6) ) ,-7) ,-5) ,-7) ,4,6) ,7) ) ,7) ) +transpose((transpose(transpose(transpose(((((((transpose(step((X+transpose(X,-7) ) ,12) ,-7) +transpose(shuffle((((X+transpose(X,7) ) +(X|X) ) +transpose(arpeggio(X) ,12) ) ) ,7) ) +transpose(shuffle(transpose(X,-5) ) ,12) ) +transpose((((X+transpose((echo(X,4,6) +transpose((X+X) ,12) ) ,12) ) +transpose((X+transpose(X,7) ) ,12) ) +transpose(((X|(X+X) ) +X) ,7) ) ,4) ) +transpose(arpeggio((X+X) ) ,7) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(X,12) ) |echo(transpose((transpose(X,-7) +transpose(echo(X,4,6) ,7) ) ,4) ,4,6) ) ,4) ) +transpose(transpose(((transpose(X,4) +transpose((arpeggio(X) |transpose((transpose(X,4) +(X+X) ) ,4) ) ,4) ) +transpose((echo((X+transpose(X,12) ) ,4,6) +(transpose((X+transpose(X,-5) ) ,-7) +((transpose(X,-5) |X) +transpose((shuffle(X) +X) ,12) ) ) ) ,7) ) ,-7) ,7) ) ,-7) ,-5) ,4) +transpose(shuffle((transpose(transpose((transpose(shuffle(((transpose(X,-7) +(X+transpose(X,12) ) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ) ,-5) |(shuffle(arpeggio((X+transpose(X,7) ) ) ) |transpose(echo(X,4,6) ,-5) ) ) ,4) ,-5) |((transpose(echo(step((shuffle(transpose(X,4) ) +transpose(X,4) ) ,12) ,4,6) ,-7) +transpose((transpose((step(step(transpose(echo(X,4,6) ,-7) ,12) ,12) |(transpose(transpose(X,-5) ,-7) +X) ) ,4) +transpose(((((echo((X+transpose(X,7) ) ,4,6) +(transpose(X,-7) +transpose((X+transpose(X,7) ) ,7) ) ) +((X+transpose(X,7) ) |(X+X) ) ) +transpose((transpose((((X|X) +(X+transpose(X,12) ) ) +transpose(transpose(X,-5) ,7) ) ,-7) |transpose(transpose(X,-5) ,-7) ) ,7) ) +((transpose((X+step(X,12) ) ,4) +transpose(shuffle((transpose(arpeggio(X) ,-5) +transpose(X,12) ) ) ,12) ) |(shuffle(transpose((X+transpose(X,12) ) ,-5) ) |transpose(transpose(((echo(X,4,6) +transpose((X+transpose(X,7) ) ,7) ) +transpose(X,-5) ) ,4) ,4) ) ) ) ,7) ) ,4) ) +transpose((transpose((transpose(transpose((echo((X+X) ,4,6) |(transpose(X,4) +transpose(echo(X,4,6) ,7) ) ) ,-5) ,-7) +transpose(echo((((X+transpose(X,4) ) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(transpose(shuffle(X) ,-7) ,-5) ,7) ) ,4,6) ,7) ) ,-7) +transpose(transpose((step((((X+((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(step(X,12) ,12) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) +transpose((transpose((X+transpose(((X+X) +transpose(arpeggio(X) ,12) ) ,7) ) ,-7) +transpose((((arpeggio(X) +transpose((X+X) ,12) ) +transpose(X,4) ) |step(transpose(X,4) ,12) ) ,7) ) ,7) ) ,-7) ,7) ) ,7) ) ) ) ,12) ) ,4) ) )
random seed used was 240378995

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