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((((transpose(step(transpose((transpose((transpose((X+transpose(X,12) ) ,4) +transpose(transpose(transpose(step(X,12) ,4) ,4) ,7) ) ,-5) +transpose(step(shuffle(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ,7) ) ,4) ,12) ,-7) |transpose((((((transpose(echo(transpose(transpose(X,4) ,-7) ,4,6) ,4) +shuffle(transpose(echo(((X|X) +transpose(X,7) ) ,4,6) ,-5) ) ) +transpose(((step((((X+transpose(X,12) ) +echo(X,4,6) ) |transpose(X,-5) ) ,12) +transpose(transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,-7) ,-5) ) +transpose(transpose(shuffle(((X|X) +(X|X) ) ) ,4) ,7) ) ,4) ) +transpose(transpose(transpose(step(X,12) ,4) ,-7) ,7) ) +transpose(transpose(transpose(((transpose(X,-7) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,4) ,-5) ,7) ) +transpose(((((arpeggio(echo(((X+((X+transpose(X,4) ) +transpose(X,7) ) ) +(echo(X,4,6) +transpose(echo(X,4,6) ,12) ) ) ,4,6) ) +transpose(step(transpose((transpose(transpose(X,-5) ,4) |(X+transpose(X,7) ) ) ,-5) ,12) ,4) ) +transpose(step(transpose((transpose(X,-5) |transpose(transpose(X,-7) ,-5) ) ,-5) ,12) ,7) ) +shuffle(transpose(((((transpose(X,4) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ,4) ) ) +transpose((((transpose((transpose(transpose(X,4) ,-5) +((arpeggio(X) +transpose(X,-7) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,-5) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) +transpose(transpose(arpeggio(transpose((transpose(X,4) |X) ,4) ) ,-7) ,12) ) +transpose((transpose(((transpose(X,-7) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) +transpose(((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,-5) +transpose(((step(transpose(X,-5) ,12) +transpose((transpose((X+transpose(X,12) ) ,4) +X) ,4) ) +transpose((transpose(step(X,12) ,-5) +(X+X) ) ,7) ) ,12) ) ,-7) ) ,7) ) ,7) ) ,4) ) +echo(step((shuffle(step(transpose((transpose((X|X) ,4) +transpose((X+(transpose(X,4) +X) ) ,12) ) ,-7) ,12) ) +transpose(echo((((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) |arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4,6) ,7) ) ,12) ,4,6) ) +shuffle(transpose((((((X|X) |X) |(transpose(step((step(transpose(X,-5) ,12) +transpose(step(X,12) ,7) ) ,12) ,4) +transpose((transpose(transpose(X,-5) ,4) +transpose(echo((X+transpose(X,7) ) ,4,6) ,4) ) ,12) ) ) +transpose((((transpose(transpose(transpose(X,4) ,4) ,-7) +transpose(transpose(transpose(transpose(X,-5) ,4) ,4) ,4) ) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) +arpeggio((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-5) |(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose((((X+X) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) +transpose(transpose((X+X) ,-7) ,12) ) ) ) ) ,4) ) +transpose(transpose(shuffle((echo((X+transpose(X,7) ) ,4,6) +transpose((X+transpose(X,12) ) ,12) ) ) ,-5) ,7) ) ,4) ) ) ,-5) +transpose(((((transpose(echo(transpose(arpeggio((step(shuffle(transpose((X|X) ,4) ) ,12) +shuffle(step(X,12) ) ) ) ,-5) ,4,6) ,4) |(transpose(transpose((transpose(transpose((((arpeggio((X+X) ) +transpose(X,4) ) +transpose(shuffle(transpose(X,-7) ) ,7) ) +((transpose(X,4) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,4) ,-7) +step(transpose(transpose(((transpose(transpose(X,-7) ,4) +transpose(transpose((X|transpose(X,-7) ) ,4) ,4) ) +transpose((step(X,12) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) ,7) ) ,-7) ,4) ,12) ) ,4) ,4) +transpose(step((((step(((((X+X) +transpose(X,12) ) +transpose((X|step(X,12) ) ,12) ) +((echo(X,4,6) +transpose(arpeggio(X) ,4) ) +transpose((X+transpose(X,4) ) ,7) ) ) ,12) +transpose(transpose((transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-7) +transpose(((transpose(X,4) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,4) ,4) ) +transpose(((transpose((X+transpose(transpose(X,4) ,7) ) ,-5) +transpose(step(((X+X) +X) ,12) ,7) ) +transpose((transpose((X+transpose(X,7) ) ,-7) |transpose(shuffle(step((X+X) ,12) ) ,4) ) ,12) ) ,7) ) |(transpose(transpose(transpose(transpose((X|X) ,4) ,-5) ,-7) ,4) +transpose((transpose(X,-7) |(transpose(X,-5) |shuffle(shuffle(X) ) ) ) ,7) ) ) ,12) ,12) ) ) |(arpeggio(transpose(transpose(transpose(shuffle(transpose((transpose(echo((((X+transpose(X,4) ) +transpose(X,7) ) +(X+transpose(X,7) ) ) ,4,6) ,4) +step((transpose((X+transpose(X,7) ) ,-5) |((X+transpose(X,7) ) |((X+X) +transpose(transpose(X,4) ,12) ) ) ) ,12) ) ,-7) ) ,4) ,-5) ,-5) ) +transpose((transpose((transpose((echo((echo(shuffle(shuffle(X) ) ,4,6) +(transpose(transpose((X|X) ,-5) ,-7) |arpeggio((transpose(X,4) +X) ) ) ) ,4,6) +(step((transpose(X,4) +transpose(transpose(X,4) ,12) ) ,12) +transpose((transpose((X+transpose(X,7) ) ,-5) +transpose(((X+transpose(X,7) ) +step(X,12) ) ,12) ) ,4) ) ) ,-7) +((step(transpose(transpose(((((X+X) +transpose((X+transpose(X,7) ) ,7) ) +transpose(X,12) ) +transpose((X+X) ,12) ) ,-5) ,-7) ,12) +(shuffle(X) |step(transpose((arpeggio(X) +X) ,-5) ,12) ) ) +transpose(transpose((transpose(X,-7) |X) ,-7) ,-5) ) ) ,-7) +transpose(arpeggio(echo((arpeggio(echo((((((X|X) +transpose(shuffle(((X+transpose(X,12) ) +transpose(X,7) ) ) ,4) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) +transpose(transpose((X+transpose((X|X) ,12) ) ,-5) ,12) ) |transpose(step((X|step(X,12) ) ,12) ,4) ) ,4,6) ) +transpose((transpose(((step((X+X) ,12) |transpose(step(X,12) ,-5) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose((transpose(X,-5) +(transpose(X,-5) +echo(X,4,6) ) ) ,-5) ) ,7) ) ,-7) +transpose((echo(((X+transpose(X,7) ) |(X+transpose(X,12) ) ) ,4,6) +transpose(transpose(((step(transpose(transpose(X,-5) ,4) ,12) +transpose(X,-7) ) |(transpose((X+transpose(X,12) ) ,-5) +shuffle(transpose(transpose(X,-7) ,-5) ) ) ) ,-7) ,7) ) ,12) ) ,7) ) ,4,6) ) ,7) ) ,12) ) ) +transpose(((echo(transpose(arpeggio(transpose(step(echo(transpose((X+X) ,4) ,4,6) ,12) ,-7) ) ,-7) ,4,6) +(transpose(transpose(step(transpose(((((arpeggio(X) |transpose(X,-5) ) +transpose(transpose((X|X) ,-7) ,12) ) |step(transpose(transpose(transpose(transpose(X,-7) ,4) ,-5) ,4) ,12) ) +transpose(transpose(transpose(((step(X,12) +transpose((X+transpose(X,12) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) ,-5) ,12) ) ,-5) ,12) ,-7) ,4) |((transpose((((((((X|(X|X) ) +transpose(echo(X,4,6) ,12) ) |transpose((X+transpose(step(X,12) ,12) ) ,-5) ) +transpose((transpose(transpose(transpose(transpose(transpose(X,-7) ,-5) ,-5) ,-7) ,-5) +((((((X|X) +transpose(((X|X) +transpose(X,12) ) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) +(transpose(X,-5) |X) ) |((transpose(transpose(X,4) ,-7) +((arpeggio(X) +transpose(shuffle(X) ,12) ) |transpose(X,-5) ) ) +(step(transpose(X,4) ,12) +transpose(((transpose(X,4) +transpose(transpose(X,-5) ,4) ) +transpose(((X+X) +transpose(X,12) ) ,7) ) ,12) ) ) ) |(echo(shuffle(X) ,4,6) |(echo(X,4,6) +(((shuffle(X) +transpose(X,4) ) +transpose(((X+transpose(X,12) ) +echo(X,4,6) ) ,7) ) |((X|X) |X) ) ) ) ) ) ,4) ) +transpose(((transpose(transpose(step(X,12) ,4) ,4) +transpose((transpose(((transpose(X,4) |((X+transpose(X,4) ) +transpose(X,7) ) ) |transpose(((X+transpose(X,12) ) |X) ,4) ) ,-7) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +arpeggio(transpose(X,4) ) ) ,7) ) ,7) ) |arpeggio(transpose((transpose(arpeggio(X) ,-7) +transpose((((transpose(X,-5) +X) +((X+transpose(X,4) ) +transpose(X,7) ) ) +((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((arpeggio(X) +transpose(X,12) ) ,7) ) ) ,12) ) ,-7) ) ) ,7) ) +transpose((((arpeggio(((transpose((X+transpose(X,7) ) ,-7) +transpose(X,-5) ) |((arpeggio(echo(X,4,6) ) |((X+transpose(X,12) ) +transpose((X|X) ,7) ) ) |arpeggio(shuffle((transpose(X,-5) +transpose(X,4) ) ) ) ) ) ) |(transpose(transpose(((X+transpose(X,12) ) |(X|X) ) ,-7) ,4) +shuffle(transpose(transpose((X|X) ,4) ,-7) ) ) ) +transpose((transpose(echo(transpose((step(X,12) +transpose(shuffle(X) ,7) ) ,4) ,4,6) ,-7) +transpose(((transpose((transpose(transpose(transpose((X+transpose(X,7) ) ,4) ,4) ,-5) +transpose(transpose(X,4) ,-7) ) ,4) +((((((shuffle(step(X,12) ) +transpose((transpose(X,4) +transpose((X+X) ,12) ) ,4) ) +transpose(((X+X) +X) ,7) ) +transpose(arpeggio(step(X,12) ) ,4) ) +transpose(transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,-7) ,7) ) +transpose(transpose(transpose((transpose(X,-5) +X) ,4) ,-7) ,4) ) +transpose((step(transpose(echo(X,4,6) ,-5) ,12) +transpose(X,12) ) ,7) ) ) +transpose(shuffle(transpose((X|X) ,-7) ) ,12) ) ,12) ) ,4) ) +transpose(transpose(((arpeggio((X+transpose(X,-7) ) ) +((transpose(X,-7) +transpose((((X+transpose(X,12) ) |arpeggio((X+transpose(X,7) ) ) ) +step(X,12) ) ,4) ) +transpose((transpose(X,-5) +transpose(X,-7) ) ,7) ) ) +transpose((((((X+transpose(X,-5) ) +transpose(step(X,12) ,4) ) +transpose(transpose(X,-7) ,7) ) +(((X+X) +transpose(echo(X,4,6) ,12) ) +step((arpeggio(X) +transpose(X,7) ) ,12) ) ) +transpose(step(echo((X+X) ,4,6) ,12) ,12) ) ,12) ) ,-7) ,7) ) ,4) ) +transpose(arpeggio((((transpose(transpose(X,4) ,4) |transpose(arpeggio(X) ,-7) ) +transpose(transpose(echo(step(X,12) ,4,6) ,-7) ,-7) ) +transpose(transpose((transpose(X,-7) |(X+X) ) ,-5) ,7) ) ) ,7) ) ,-7) +transpose((transpose(step(transpose(((transpose((X+transpose((X|X) ,7) ) ,4) +transpose((transpose(transpose(X,-7) ,4) +transpose((X+X) ,-5) ) ,12) ) |transpose((transpose(X,4) |(arpeggio(X) +transpose(X,12) ) ) ,4) ) ,-7) ,12) ,4) +transpose((transpose(step((transpose((transpose((X+X) ,-5) |shuffle(echo(X,4,6) ) ) ,-7) +transpose((transpose(transpose(X,4) ,-7) +step(X,12) ) ,7) ) ,12) ,-5) |((transpose(step(echo((X+transpose(X,7) ) ,4,6) ,12) ,-7) |transpose(transpose((X+(X|X) ) ,-7) ,-5) ) |(transpose(transpose(arpeggio((transpose(step(X,12) ,-5) +(step(transpose(X,-7) ,12) +(X+transpose(X,12) ) ) ) ) ,-5) ,4) +transpose((((((transpose(transpose(transpose(X,4) ,4) ,-5) |(X|transpose(transpose(X,-7) ,-5) ) ) +transpose(arpeggio((X+X) ) ,4) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) +transpose(((((transpose((X|X) ,-5) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) +transpose(transpose((((transpose(X,4) +transpose((X+X) ,4) ) +transpose(transpose(X,4) ,7) ) +((transpose(X,-7) +transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,4) ) +transpose(transpose((X+X) ,4) ,7) ) ,12) ) +transpose(step(transpose(((X+transpose(X,7) ) |X) ,-7) ,12) ,4) ) ,-5) ) ) ) ,12) ) ,4) ) +transpose(echo(((transpose(((transpose(((X|(X+X) ) +transpose(shuffle(echo((transpose(X,-5) |(X|X) ) ,4,6) ) ,12) ) ,-7) +transpose((step(arpeggio((X|echo(X,4,6) ) ) ,12) +(arpeggio(echo(transpose(transpose(X,-7) ,4) ,4,6) ) +transpose((echo(((X+X) +transpose(X,12) ) ,4,6) +transpose(X,7) ) ,12) ) ) ,4) ) +transpose((transpose(X,4) +echo((echo(step(X,12) ,4,6) +transpose((X+transpose(step(X,12) ,12) ) ,7) ) ,4,6) ) ,7) ) ,-5) +transpose(((((((((arpeggio(((X|transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(((X+transpose((X+transpose(X,7) ) ,12) ) +transpose(((X+X) +transpose(X,4) ) ,7) ) ,4) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) +transpose(step(shuffle((((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ) ,12) ,4) ) +transpose(transpose((transpose(X,-7) +(X+transpose((((X+X) +transpose(transpose(X,4) ,4) ) +transpose((X+X) ,7) ) ,7) ) ) ,4) ,7) ) +transpose((arpeggio(((echo(X,4,6) |transpose(X,4) ) +((step(X,12) +transpose(transpose(X,-7) ,12) ) +shuffle(X) ) ) ) +transpose((((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(X,4) ) +transpose(transpose((X+X) ,-7) ,7) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ,12) ) ,4) ) +transpose((((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) +transpose(transpose(X,-5) ,4) ) +transpose((step(transpose(X,4) ,12) +transpose(transpose(X,-7) ,-5) ) ,7) ) |(transpose(X,-5) +transpose(transpose(arpeggio(X) ,-7) ,12) ) ) ,7) ) +transpose(arpeggio((echo(X,4,6) +transpose(transpose((transpose(X,4) +arpeggio(shuffle(X) ) ) ,-7) ,7) ) ) ,12) ) |(((transpose(step(transpose(transpose(X,-7) ,-7) ,12) ,4) +transpose(((X+transpose(arpeggio(transpose(X,-7) ) ,4) ) +transpose(((transpose(X,4) +transpose((((X+X) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,4) ) +transpose((transpose(X,4) +step((X+transpose(X,12) ) ,12) ) ,7) ) ,7) ) ,7) ) +transpose(transpose(X,4) ,12) ) +transpose(transpose(echo(((X+transpose(X,12) ) +transpose(X,12) ) ,4,6) ,-7) ,7) ) ) ,12) ) +transpose(((transpose(transpose(((X+X) |transpose(echo(X,4,6) ,-7) ) ,4) ,4) +transpose(((step((transpose(X,-7) +transpose(X,-5) ) ,12) |(transpose(X,-7) +transpose((X+transpose(X,12) ) ,7) ) ) |transpose(transpose((transpose(X,-7) +X) ,4) ,4) ) ,7) ) +transpose((transpose((echo(X,4,6) |(shuffle(X) +transpose((X+transpose(X,7) ) ,7) ) ) ,-5) |(transpose((X+echo(X,4,6) ) ,-7) |transpose(X,-5) ) ) ,-7) ) ,12) ) ,4,6) ,7) ) ) ) +transpose(arpeggio(((shuffle(transpose(step(transpose((transpose(X,4) +transpose(transpose(X,-5) ,7) ) ,4) ,12) ,4) ) |echo(transpose(arpeggio((transpose((arpeggio(((transpose(X,-5) +step(X,12) ) +transpose((X+step(X,12) ) ,7) ) ) +echo(echo(X,4,6) ,4,6) ) ,-5) +transpose(step(transpose(X,-7) ,12) ,4) ) ) ,-5) ,4,6) ) +((echo(transpose(((transpose(shuffle((step(shuffle(echo((X|X) ,4,6) ) ,12) |transpose(step(shuffle(X) ,12) ,-5) ) ) ,-5) +transpose(transpose(((((X+transpose(X,7) ) |transpose(X,4) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,7) ) +transpose(echo((transpose((X+transpose(X,7) ) ,-5) +transpose(transpose(shuffle(X) ,-5) ,12) ) ,4,6) ,7) ) ,-5) ,-7) ) +transpose(echo(echo(X,4,6) ,4,6) ,-5) ) ,4) ,4,6) +transpose(((shuffle((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,7) ) ,-7) +transpose((((X+transpose((X|X) ,7) ) +transpose(arpeggio((X+transpose(X,4) ) ) ,4) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) ,12) ) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(step(X,12) |(X+transpose(X,12) ) ) ) ,-7) ,-5) ) +(((echo((transpose(transpose(X,-7) ,4) +echo((X|shuffle(transpose(X,4) ) ) ,4,6) ) ,4,6) +transpose(transpose(((((echo(X,4,6) +transpose((transpose(X,-5) +shuffle(X) ) ,4) ) +transpose(arpeggio(X) ,7) ) |transpose(X,-7) ) +transpose(transpose((X|arpeggio(X) ) ,4) ,12) ) ,4) ,4) ) +transpose(transpose(transpose(transpose((step(X,12) +transpose(shuffle(X) ,-7) ) ,-7) ,4) ,4) ,7) ) +(((((transpose(X,-7) +transpose(arpeggio((X+transpose(X,12) ) ) ,12) ) +transpose(transpose(X,-5) ,12) ) +transpose((transpose(X,-5) +transpose(transpose(((((X+X) +transpose(transpose(X,-7) ,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-7) ,7) ) ,7) ) +transpose(((transpose((transpose(X,-5) +transpose(X,7) ) ,-5) +transpose(step((shuffle(X) |(X+X) ) ,12) ,7) ) +transpose(X,-7) ) ,4) ) +transpose(transpose(transpose(transpose(step(X,12) ,-5) ,-5) ,4) ,7) ) ) ) ,12) ) |(step(shuffle(((((X+transpose((X+transpose(step((X+transpose(X,7) ) ,12) ,7) ) ,4) ) +transpose(((transpose(X,-7) +transpose((X+X) ,7) ) |shuffle(transpose(X,-5) ) ) ,7) ) +transpose((step(((echo(echo(X,4,6) ,4,6) |step(X,12) ) +(X|transpose((X+transpose(X,7) ) ,-7) ) ) ,12) |(((X+X) +(step(transpose(transpose(X,-5) ,-5) ,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +transpose((shuffle((((X+X) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((transpose(X,-7) +transpose(transpose(X,4) ,7) ) ,12) ) ) |echo((X|((transpose(X,4) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ) ,4,6) ) ,12) ) ) ,4) ) +transpose(echo(transpose(transpose(echo((X+X) ,4,6) ,-5) ,4) ,4,6) ,7) ) ) ,12) +((((transpose(transpose(transpose(X,-5) ,-7) ,4) +transpose(shuffle(X) ,7) ) +transpose(shuffle(transpose(arpeggio(transpose(X,-5) ) ,-7) ) ,12) ) |step(echo(step(((transpose(X,-7) +transpose(X,12) ) |transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ) ,12) ,4,6) ,12) ) +transpose(transpose((transpose(transpose(X,-5) ,4) +(transpose(transpose(((X+transpose(X,12) ) +transpose((X+X) ,7) ) ,4) ,4) +echo((((X+X) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,4,6) ) ) ,-5) ,7) ) ) ) ) ) ,12) ) ,4) ) +transpose(transpose(transpose(((((transpose(transpose(((X|(X+X) ) +transpose(transpose(arpeggio(X) ,-7) ,7) ) ,-5) ,-5) +transpose(echo(((shuffle(X) |X) +transpose(X,7) ) ,4,6) ,4) ) +transpose(transpose(transpose(shuffle(transpose(shuffle(arpeggio((X|X) ) ) ,-7) ) ,-5) ,4) ,7) ) |transpose(transpose(transpose((transpose(transpose(echo(X,4,6) ,4) ,4) +arpeggio(transpose(shuffle(X) ,4) ) ) ,4) ,-7) ,-7) ) +((transpose((transpose((((((transpose(X,4) |X) |(transpose(X,4) |(X|X) ) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(transpose(transpose(transpose(X,4) ,4) ,-5) ,-5) ) |transpose(transpose(transpose(X,4) ,-5) ,4) ) ,-7) +step(transpose(transpose(((arpeggio(transpose(X,-7) ) +transpose(step(X,12) ,12) ) +transpose(step(step(X,12) ,12) ,12) ) ,4) ,-5) ,12) ) ,-7) +transpose(arpeggio(transpose(echo(echo(((transpose(X,-7) +X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4,6) ,4,6) ,-7) ) ,4) ) +transpose(((echo(echo((transpose(shuffle((step(echo(shuffle(X) ,4,6) ,12) +transpose(shuffle((X+transpose(X,12) ) ) ,4) ) ) ,-7) |(transpose((step((X+transpose(X,12) ) ,12) +transpose(transpose(echo(X,4,6) ,-5) ,12) ) ,-5) |(shuffle(transpose(transpose(transpose(X,4) ,4) ,-7) ) +((X+transpose(transpose(X,-5) ,7) ) |transpose(transpose(transpose(X,4) ,4) ,4) ) ) ) ) ,4,6) ,4,6) +transpose(arpeggio(shuffle(arpeggio((transpose(X,-7) |arpeggio(X) ) ) ) ) ,4) ) +transpose((((step((((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(shuffle(X) ,12) ) ,12) +transpose(shuffle(((X+transpose((X+X) ,7) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,4) ) +transpose(transpose(((X+transpose(X,12) ) +transpose(transpose(X,4) ,7) ) ,-5) ,7) ) +transpose((step(step(transpose(transpose(transpose(X,-5) ,4) ,-5) ,12) ,12) +transpose(transpose(step(transpose(X,-5) ,12) ,4) ,7) ) ,12) ) ,7) ) ,7) ) ) ,-7) ,-5) ,7) ) ,7) )
random seed used was 105330346

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