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:
Seed:
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Phrase for X:
# of Tracks:
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After 20 generations the expression "X" became this:
(shuffle(transpose(transpose((transpose(((transpose(transpose(arpeggio(((step(echo(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,4,6) ,12) +transpose(((echo(X,4,6) |(X+transpose((X+X) ,12) ) ) |transpose((X+transpose(transpose(X,-5) ,7) ) ,-7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,4) ,4) +(arpeggio(transpose(transpose(transpose((((transpose((transpose(X,-7) +transpose(step(X,12) ,7) ) ,4) |X) +transpose((((transpose(X,-5) +transpose(transpose(X,-5) ,7) ) +echo(arpeggio(X) ,4,6) ) |(X+transpose(echo(X,4,6) ,12) ) ) ,4) ) +transpose(echo(((X|(X|X) ) +transpose(((X+transpose(transpose(X,4) ,4) ) +transpose(transpose(X,4) ,7) ) ,12) ) ,4,6) ,7) ) ,-7) ,-7) ,4) ) +(((echo((echo(echo(shuffle(transpose(X,-5) ) ,4,6) ,4,6) +((step(((X|X) +X) ,12) |((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose((X+X) ,4) ,7) ) ) +transpose((transpose(X,-5) +transpose((X+X) ,12) ) ,7) ) ) ,4,6) +echo(echo(((transpose(transpose((echo(X,4,6) |X) ,-5) ,-7) +transpose(transpose(X,4) ,4) ) +transpose(arpeggio(X) ,7) ) ,4,6) ,4,6) ) |shuffle(step((echo(echo(transpose(X,-7) ,4,6) ,4,6) +X) ,12) ) ) |(((echo(transpose(X,-5) ,4,6) +((((((X+transpose(X,7) ) |X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) +transpose(step(transpose(X,4) ,12) ,12) ) +transpose(echo(step(X,12) ,4,6) ,7) ) ) +transpose(arpeggio(echo(((transpose((transpose(X,-5) +transpose(X,4) ) ,-7) +transpose(step(((X+transpose(X,7) ) +(X+transpose(X,7) ) ) ,12) ,7) ) +(((((shuffle(X) |echo(X,4,6) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+arpeggio(X) ) ,7) ) +transpose(echo((transpose(X,4) +step(X,12) ) ,4,6) ,12) ) +(X|X) ) ) ,4,6) ) ,4) ) +transpose((transpose(echo(((transpose((X+transpose(X,12) ) ,-7) +transpose(transpose((X+X) ,-7) ,4) ) +transpose((X|X) ,7) ) ,4,6) ,-7) +transpose(transpose(transpose(step(X,12) ,-7) ,-7) ,12) ) ,7) ) ) ) ) |transpose(echo(transpose(arpeggio(arpeggio((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(transpose(X,4) ,4) ) +transpose(transpose(shuffle(X) ,4) ,7) ) |(((transpose(X,4) +transpose(X,7) ) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ) ) ) ,-7) ,4,6) ,-7) ) ,4) +((transpose(((step(shuffle(transpose(echo(transpose((X+transpose(X,7) ) ,4) ,4,6) ,4) ) ,12) +transpose(transpose(transpose((transpose(transpose((X+transpose(transpose(X,-5) ,7) ) ,4) ,4) +transpose(step((X+X) ,12) ,12) ) ,4) ,-5) ,-5) ) +transpose(transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((step(X,12) |step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) |((((X|X) +step(X,12) ) +transpose(X,4) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) ) ,7) ) +((X+transpose(((((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |transpose(X,4) ) |transpose(transpose((X|X) ,4) ,-5) ) ,4) ) +transpose(echo((transpose(shuffle(X) ,4) |transpose(arpeggio(X) ,-7) ) ,4,6) ,7) ) ) ,-5) ,4) ,12) ) ,4) +transpose(echo((((transpose(echo(shuffle(X) ,4,6) ,-7) +transpose(((X+transpose(arpeggio(X) ,12) ) |transpose(transpose(arpeggio(X) ,-7) ,-5) ) ,12) ) +transpose(transpose((transpose(transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-5) ) ,-7) ,-5) ,4) +transpose((((((transpose(X,4) |arpeggio(X) ) +(arpeggio(X) |(X+X) ) ) |transpose(((X+transpose(X,7) ) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose((((transpose((X+X) ,4) +transpose(shuffle(X) ,12) ) +transpose(transpose((X+transpose(transpose(X,4) ,7) ) ,-5) ,4) ) +transpose(((X+transpose(shuffle(arpeggio(X) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ,12) ) +((X+(X|X) ) +((X+transpose(shuffle((X+transpose(X,12) ) ) ,4) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) ) ) ,12) ) ,-5) ,4) ) +transpose(transpose(transpose(((((step(X,12) |echo(X,4,6) ) +transpose((X+X) ,7) ) +transpose(transpose(transpose(transpose(X,-5) ,-7) ,-7) ,4) ) +transpose(echo(transpose(transpose(X,4) ,4) ,4,6) ,7) ) ,4) ,-7) ,7) ) ,4,6) ,4) ) +transpose(step(transpose((transpose(((X+transpose(X,12) ) +arpeggio((transpose(X,-5) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ,4) |transpose(((((((((X|(X+transpose(X,7) ) ) +X) +transpose(transpose(transpose((X+transpose(X,12) ) ,-7) ,-5) ,7) ) +transpose((arpeggio(step(X,12) ) |(transpose(X,-7) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ) ) ,4) ) +transpose(transpose(((X+transpose(X,12) ) |shuffle(X) ) ,-5) ,7) ) +transpose(arpeggio((transpose((X+X) ,4) +transpose(step(X,12) ,7) ) ) ,4) ) +transpose(((X+transpose((X+X) ,4) ) +transpose((shuffle((X+transpose(X,12) ) ) +transpose(transpose(X,-7) ,12) ) ,7) ) ,7) ) +transpose((echo((transpose(((X+X) |echo(X,4,6) ) ,-7) +transpose(echo(arpeggio(transpose(X,-5) ) ,4,6) ,12) ) ,4,6) +transpose(transpose((transpose((X+transpose((X+step(X,12) ) ,7) ) ,-7) +(X|(X+transpose(X,12) ) ) ) ,-7) ,12) ) ,7) ) ,-7) ) ,4) ,12) ,7) ) ) ,-5) ,-7) ) |((transpose(arpeggio(transpose(transpose(((((X+transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +((transpose(X,4) +transpose(arpeggio(X) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) ) |step((X|(transpose(X,-7) +transpose(X,7) ) ) ,12) ) ,4) ,-7) ) ,4) |(((transpose(shuffle(step((step(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4) ) +transpose((X|(X+X) ) ,7) ) ,12) +transpose(((X|X) +echo(X,4,6) ) ,7) ) ,12) ) ,-7) +transpose(((arpeggio(shuffle((shuffle(X) +transpose(transpose(((X+echo(X,4,6) ) |(echo(X,4,6) +transpose(((X+transpose(X,12) ) +transpose(transpose(X,4) ,12) ) ,12) ) ) ,4) ,12) ) ) ) |transpose(transpose((transpose(((X+X) +transpose(X,-5) ) ,-7) +transpose(transpose(transpose((X|X) ,-7) ,-5) ,12) ) ,-7) ,4) ) +transpose((((X|X) +transpose(echo(((transpose(X,-7) +transpose(shuffle(X) ,4) ) +transpose((X+transpose(X,-7) ) ,7) ) ,4,6) ,12) ) +transpose(arpeggio((((arpeggio(transpose(X,-5) ) +(shuffle(X) +transpose(arpeggio(X) ,12) ) ) +transpose(step((X+transpose(transpose(X,-7) ,12) ) ,12) ,12) ) |((((transpose(X,-7) +transpose(shuffle(X) ,12) ) |transpose((X+X) ,4) ) +transpose(echo(X,4,6) ,4) ) +transpose(arpeggio(echo(transpose(echo(X,4,6) ,-7) ,4,6) ) ,7) ) ) ) ,12) ) ,12) ) ,4) ) +transpose(transpose((transpose(transpose(step(transpose(X,-7) ,12) ,4) ,-7) |((((X+echo(X,4,6) ) |transpose(transpose(echo(X,4,6) ,-5) ,-5) ) +transpose((transpose(X,-7) |transpose((X+X) ,-7) ) ,7) ) +transpose((transpose(echo(shuffle(transpose(X,-5) ) ,4,6) ,4) +transpose(transpose(transpose((X+X) ,4) ,-5) ,7) ) ,12) ) ) ,4) ,7) ) |transpose(((transpose((((transpose(transpose(X,-5) ,-5) +transpose((transpose(X,4) +X) ,12) ) +transpose(arpeggio(X) ,4) ) +transpose(step(shuffle(X) ,12) ,7) ) ,4) +transpose(echo((((step(arpeggio(step(transpose(transpose(X,-5) ,-5) ,12) ) ,12) +transpose((((X+transpose(X,7) ) |X) +transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose(transpose((((X+X) +transpose(arpeggio(X) ,4) ) +transpose(((X|(X+transpose(X,12) ) ) |((X+transpose(X,12) ) +X) ) ,-5) ) ,-5) ,4) ) +transpose(((((((step(X,12) +transpose((X+X) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(((((X|X) +transpose((step(X,12) +transpose(X,7) ) ,7) ) +transpose((shuffle((X|X) ) |X) ,4) ) +transpose((echo(X,4,6) +(X+X) ) ,7) ) ,12) ) +transpose(step(((X|shuffle((X+X) ) ) |transpose((X+transpose(X,4) ) ,-7) ) ,12) ,4) ) +transpose(transpose(echo((transpose(X,4) |transpose(X,4) ) ,4,6) ,-5) ,7) ) +transpose(step(((transpose(X,-7) +transpose(transpose(X,-5) ,4) ) +transpose((X|X) ,7) ) ,12) ,12) ) ,7) ) ,4,6) ,12) ) +transpose(transpose(step(transpose(((((transpose(((transpose(X,4) +transpose(X,7) ) +transpose(X,12) ) ,-7) |transpose(shuffle(transpose(step(X,12) ,-7) ) ,-7) ) +transpose(((X+transpose(shuffle(echo(step(X,12) ,4,6) ) ,7) ) +transpose(transpose(((arpeggio((X+transpose(X,-7) ) ) |transpose(shuffle(step(X,12) ) ,4) ) |shuffle((X+transpose(transpose(X,4) ,7) ) ) ) ,4) ,7) ) ,4) ) +transpose(shuffle(transpose(step(transpose(X,-5) ,12) ,4) ) ,7) ) +transpose(((echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4,6) +transpose(step((X|X) ,12) ,4) ) +transpose(step((X+transpose(X,7) ) ,12) ,7) ) ,7) ) ,4) ,12) ,-5) ,12) ) ,4) ) ) |(((transpose(transpose(((transpose(transpose(echo(transpose(echo(((shuffle(shuffle((X+X) ) ) +transpose((X+(X+transpose(transpose(X,4) ,12) ) ) ,4) ) +transpose(echo((X+X) ,4,6) ,7) ) ,4,6) ,-7) ,4,6) ,-5) ,4) +transpose((step(transpose(transpose(((X+transpose((X|X) ,7) ) +transpose((transpose((X+transpose(X,12) ) ,4) +transpose(arpeggio(X) ,7) ) ,7) ) ,-7) ,-7) ,12) |echo(transpose((step(((X+(transpose((X+X) ,-5) +transpose((X|transpose(X,-5) ) ,12) ) ) +transpose(arpeggio(((X|X) |transpose(X,-7) ) ) ,12) ) ,12) |transpose(transpose((X+X) ,-7) ,4) ) ,-5) ,4,6) ) ,4) ) +transpose(transpose(echo((((transpose(transpose(transpose(transpose(X,4) ,-7) ,-7) ,4) +transpose(step((step(step(X,12) ,12) +(transpose((X+transpose(X,12) ) ,4) +transpose(shuffle(((transpose(X,4) +transpose(X,7) ) |(transpose(X,4) +step(transpose(X,-5) ,12) ) ) ) ,7) ) ) ,12) ,4) ) +transpose((transpose((transpose(X,-7) +transpose(((X+transpose(X,7) ) |step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ) ,4) +shuffle(step(X,12) ) ) ,7) ) +transpose(step(((echo(transpose(step(X,12) ,-5) ,4,6) |transpose(arpeggio(X) ,-5) ) +step((transpose(X,-5) +X) ,12) ) ,12) ,12) ) ,4,6) ,-7) ,7) ) ,-5) ,-5) +transpose(((transpose(arpeggio(transpose(arpeggio(((step((X+X) ,12) +X) +((transpose(((X|X) +transpose(X,7) ) ,4) +((X|X) +shuffle(X) ) ) |(echo(transpose((shuffle(X) +transpose((X+X) ,7) ) ,-5) ,4,6) |transpose((transpose((X+transpose(X,12) ) ,-5) +transpose(transpose(arpeggio(X) ,-5) ,7) ) ,-5) ) ) ) ) ,-7) ) ,-5) +transpose(shuffle(((step((transpose((transpose(echo(shuffle(transpose(transpose(X,4) ,-5) ) ,4,6) ,4) +transpose(((X+X) +X) ,12) ) ,4) +transpose(step(echo((X+transpose((X+X) ,7) ) ,4,6) ,12) ,4) ) ,12) |transpose(transpose(transpose((transpose((X+transpose(X,-5) ) ,4) +transpose(transpose(transpose(transpose(step(X,12) ,4) ,-7) ,-7) ,7) ) ,4) ,4) ,-5) ) +transpose(transpose((transpose(arpeggio(transpose((X+X) ,-7) ) ,-5) +transpose((((transpose((((X|X) +transpose(step(X,12) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-5) +transpose(((X+transpose(echo(X,4,6) ,12) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ,4) ) +transpose(step(X,12) ,7) ) |transpose((transpose(X,4) +X) ,-5) ) ,12) ) ,-7) ,7) ) ) ,4) ) +transpose(arpeggio(((arpeggio(transpose((step(transpose(X,4) ,12) +(echo(X,4,6) +transpose(X,-7) ) ) ,4) ) +transpose(transpose(((X+X) +transpose((arpeggio(shuffle((X+transpose(X,12) ) ) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-5) ) +transpose((X|X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ,7) ) ,-5) ,12) ) +transpose((((((transpose(((X|X) |echo(X,4,6) ) ,4) +transpose((X+transpose(transpose(X,-5) ,7) ) ,7) ) +transpose(((transpose(transpose(echo(X,4,6) ,-7) ,4) +transpose((echo(transpose(X,4) ,4,6) +transpose(transpose(echo((X+transpose(X,7) ) ,4,6) ,-5) ,-5) ) ,4) ) +transpose(step(((X+transpose((X+transpose((X|X) ,7) ) ,7) ) +transpose(arpeggio(X) ,12) ) ,12) ,7) ) ,4) ) +transpose(arpeggio(transpose(transpose(((X|X) +transpose(X,12) ) ,4) ,-7) ) ,7) ) +transpose((((transpose(X,4) +arpeggio((transpose(step(transpose(X,-7) ,12) ,-5) +transpose(((transpose(X,-5) +X) +shuffle(X) ) ,7) ) ) ) +transpose((step(X,12) +transpose((shuffle(step(X,12) ) |transpose(X,4) ) ,12) ) ,4) ) +transpose((echo((((shuffle(transpose(X,-7) ) +transpose(arpeggio(X) ,12) ) +transpose(arpeggio(arpeggio(shuffle(X) ) ) ,4) ) +transpose(transpose(transpose(transpose(X,-5) ,4) ,-7) ,7) ) ,4,6) +(transpose(transpose(X,-5) ,-5) |(arpeggio(X) |transpose(X,4) ) ) ) ,7) ) ,12) ) |(step((transpose(X,4) +transpose((X|transpose(X,-7) ) ,12) ) ,12) |((arpeggio(transpose(transpose((X+transpose(X,7) ) ,-7) ,-5) ) +transpose((transpose(transpose(X,-5) ,4) +transpose(((((((X+X) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(transpose((X|X) ,-5) ,4) ) +transpose(X,7) ) +(((((X+transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(X,4) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ) ,7) ) ,12) ) |transpose(step(transpose((X+X) ,-7) ,12) ,4) ) ) ) ,12) ) ) ,7) ) ,4) ) +transpose((((transpose((((transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(step(step(X,12) ,12) ,7) ) ,-7) |(step(transpose(X,4) ,12) +transpose(transpose((X|arpeggio(X) ) ,-7) ,7) ) ) +transpose((arpeggio(X) |(X|X) ) ,12) ) +((shuffle(X) +transpose(transpose(X,-5) ,7) ) +((echo(X,4,6) +(X|X) ) +transpose(X,-7) ) ) ) ,-5) +((((((X+(X+X) ) +shuffle((X+transpose(X,7) ) ) ) +((transpose(X,-5) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ) |((((X|X) +transpose(transpose(X,-5) ,12) ) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) ) +(transpose(X,-5) |(X+(X+transpose(X,12) ) ) ) ) ) +transpose(step((transpose(arpeggio(X) ,4) |transpose((X+transpose((X+X) ,7) ) ,-7) ) ,12) ,7) ) +transpose((shuffle((((transpose(X,-5) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(X,7) ) ) |((X+transpose(X,7) ) +transpose((((X+X) +transpose(transpose(X,4) ,4) ) +transpose((X|X) ,7) ) ,7) ) ) ,-7) ) ) +transpose((step((transpose(step(shuffle(transpose(X,4) ) ,12) ,-5) +transpose(transpose((X+transpose(shuffle(transpose(((X+transpose(X,12) ) +X) ,-7) ) ,12) ) ,-5) ,7) ) ,12) +transpose(arpeggio(transpose(arpeggio(step(transpose(X,4) ,12) ) ,4) ) ,-5) ) ,7) ) |((transpose(transpose((shuffle(transpose(transpose((X+transpose(X,-5) ) ,-7) ,4) ) |transpose(transpose(step(transpose(step(X,12) ,-7) ,12) ,-5) ,-7) ) ,-5) ,-7) +transpose(transpose(transpose(((echo(X,4,6) +((echo(X,4,6) +transpose(transpose(X,-5) ,4) ) +transpose(echo(X,4,6) ,7) ) ) +(arpeggio(X) +(X+X) ) ) ,-5) ,-7) ,12) ) |echo(((((step(echo(X,4,6) ,12) +shuffle(transpose(step(X,12) ,-7) ) ) +transpose(transpose(((X+transpose(transpose(transpose(transpose(echo(X,4,6) ,-5) ,-7) ,4) ,4) ) +transpose(X,7) ) ,-7) ,12) ) +transpose(transpose(((transpose(X,4) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,-5) ,-5) ) |arpeggio(transpose(transpose((X+transpose(transpose(transpose(X,-5) ,-5) ,12) ) ,-5) ,4) ) ) ,4,6) ) ) ,7) ) |transpose((transpose(((shuffle((shuffle(arpeggio(transpose(((transpose(X,4) +X) |(step((X+transpose(X,12) ) ,12) +((X+transpose(X,12) ) +transpose(X,12) ) ) ) ,-7) ) ) +transpose(transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4) ,4) ,7) ) ) +transpose(echo((transpose((step(transpose(X,-5) ,12) +(X+X) ) ,4) +(shuffle((X+transpose(transpose(arpeggio(X) ,-7) ,12) ) ) +(((transpose(echo(step(X,12) ,4,6) ,-7) +transpose(((X+transpose(shuffle(X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose((transpose(X,4) |transpose(X,4) ) ,7) ) +step(X,12) ) ) ) ,4,6) ,4) ) +transpose((transpose(((arpeggio((X|X) ) +transpose(transpose(X,4) ,-5) ) +transpose(((transpose(transpose(step((X+X) ,12) ,4) ,-7) |((transpose(((X+transpose((X|X) ,4) ) +transpose(X,7) ) ,-5) +transpose(transpose(X,-7) ,12) ) +transpose(transpose(((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-5) ,4) ) ) +step(step(arpeggio(transpose((X|X) ,4) ) ,12) ,12) ) ,7) ) ,-7) +((transpose(arpeggio(transpose((step(X,12) |X) ,4) ) ,4) +((((X+X) +transpose((transpose(X,4) +transpose(shuffle(X) ,12) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose((step(transpose((transpose(X,4) +(X+transpose(X,12) ) ) ,4) ,12) |transpose((transpose((X|X) ,-5) +transpose(echo(X,4,6) ,12) ) ,-7) ) ,7) ) ) |((transpose((((((X+transpose(X,4) ) +transpose(X,7) ) |X) |transpose(transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,4) ) |((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(transpose(X,-5) ,-5) ) ) ,-5) +transpose(shuffle((echo(echo(X,4,6) ,4,6) +transpose((X+transpose(transpose(X,-7) ,12) ) ,7) ) ) ,4) ) +transpose(((((transpose(transpose(X,-5) ,-5) +transpose(((transpose(echo((X|X) ,4,6) ,-5) +transpose(transpose(((X+transpose(X,7) ) |X) ,4) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) +transpose((transpose((X+transpose(transpose(X,-7) ,7) ) ,-5) +transpose(transpose(transpose((X+X) ,-5) ,-5) ,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose((X|X) ,7) ) ,7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) ,-5) ) ,7) ) ) ) ,7) ) ,4) +(((transpose(step((transpose((X+transpose(X,7) ) ,4) |transpose(X,4) ) ,12) ,-7) +transpose(transpose(((arpeggio(transpose(transpose(shuffle(X) ,-7) ,-7) ) +transpose(transpose(transpose(transpose((X+X) ,4) ,-5) ,-5) ,12) ) +transpose((arpeggio((X+X) ) +transpose(((X+transpose(X,12) ) |(X+X) ) ,7) ) ,12) ) ,-5) ,12) ) |shuffle(transpose((transpose((transpose(X,-5) +step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-5) |((shuffle(X) +transpose(transpose(X,-7) ,12) ) +transpose(((X+X) +transpose(shuffle(X) ,12) ) ,12) ) ) ,-7) ) ) +transpose(step(shuffle((echo((X+transpose(((X+transpose(X,7) ) |transpose(X,4) ) ,12) ) ,4,6) |(echo((transpose(transpose(X,-7) ,-7) |transpose(X,-7) ) ,4,6) |((X+transpose((X+X) ,12) ) +(X+X) ) ) ) ) ,12) ,12) ) ) ,-7) ) ) )
random seed used was 198411885

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