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:
transpose(transpose(((((((shuffle(transpose((transpose((transpose(((((transpose(transpose((echo(X,4,6) +(X+transpose(X,7) ) ) ,-5) ,-7) +transpose(((arpeggio(transpose(X,-5) ) +transpose(shuffle(((X+transpose(transpose(X,-5) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose(transpose((((X+transpose(X,12) ) +transpose((transpose(X,-5) +transpose(transpose(X,-7) ,12) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) ,7) ) |transpose(step(transpose(((X+X) +transpose(X,12) ) ,-5) ,12) ,-7) ) ,4) +transpose(transpose(transpose(((((X+X) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) |step(arpeggio(X) ,12) ) ,-7) ,4) ,7) ) ,-7) +transpose(echo((transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) +arpeggio(((transpose(X,4) +step(X,12) ) +transpose((transpose(X,-5) +transpose((X|X) ,12) ) ,7) ) ) ) ,4,6) ,7) ) ,-5) ) +transpose((transpose(transpose((step(((X+X) +transpose(transpose(X,-7) ,12) ) ,12) +transpose(transpose(step(arpeggio(echo((((((((X+transpose(X,12) ) +transpose(X,7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,7) ) ,4) ) +transpose(((X+X) +transpose(step(X,12) ,12) ) ,7) ) |(X+transpose(X,12) ) ) +transpose(transpose(((echo(X,4,6) |X) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,7) ) ,7) ) ,-7) ,4) ) +transpose(((X|transpose(X,-7) ) +transpose(transpose(X,-7) ,12) ) ,7) ) ,4,6) ) ,12) ,-5) ,12) ) ,-7) ,-5) +transpose(step((arpeggio(((((transpose(arpeggio(X) ,-5) +transpose((echo(transpose(X,-7) ,4,6) +transpose(shuffle(X) ,7) ) ,12) ) +transpose(step(shuffle(transpose(X,-5) ) ,12) ,7) ) |arpeggio(transpose(step(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,-5) ) ) |step(transpose(arpeggio(transpose(((X+transpose(X,7) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ,-7) ) ,-7) ,12) ) ) +arpeggio(echo(transpose(transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,-5) ,-7) ,4,6) ) ) ,12) ,12) ) ,4) ) +transpose((transpose(((transpose(echo(((transpose((transpose((X+transpose(X,7) ) ,4) +transpose(transpose(transpose(transpose((X|echo(X,4,6) ) ,-7) ,-5) ,-7) ,7) ) ,-5) +transpose((((transpose((step(X,12) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) +transpose((((((transpose(X,-7) +transpose(step(X,12) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose((transpose(X,-5) +transpose(echo(X,4,6) ,12) ) ,7) ) +transpose((transpose((X|X) ,-7) +transpose(transpose(X,-5) ,12) ) ,7) ) +transpose(arpeggio((echo(arpeggio(X) ,4,6) +transpose(step(X,12) ,12) ) ) ,7) ) ,7) ) +transpose((shuffle(arpeggio(transpose(X,4) ) ) +transpose((arpeggio(arpeggio(transpose(X,-5) ) ) +transpose(transpose(step(X,12) ,-5) ,12) ) ,7) ) ,4) ) +transpose((arpeggio(arpeggio(X) ) |shuffle(shuffle((X+transpose(X,12) ) ) ) ) ,7) ) ,4) ) +transpose(echo(transpose(transpose(shuffle(shuffle(X) ) ,-5) ,-5) ,4,6) ,7) ) ,4,6) ,-7) +transpose(((transpose(echo((transpose(transpose(echo(transpose((X+transpose(X,12) ) ,-5) ,4,6) ,-5) ,-7) |((transpose(shuffle(X) ,4) +(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,12) ) ,-7) +transpose(((X+transpose(shuffle(X) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ) ) +transpose(transpose(transpose(step(transpose(shuffle((X+transpose(X,12) ) ) ,-7) ,12) ,-7) ,4) ,7) ) ) ,4,6) ,-7) +transpose(transpose((transpose(shuffle((step((X+transpose(X,12) ) ,12) +transpose((X+transpose(X,12) ) ,7) ) ) ,-5) |echo(transpose(transpose(shuffle(transpose(X,4) ) ,-5) ,4) ,4,6) ) ,4) ,4) ) +transpose(transpose(shuffle(echo(echo((((X+transpose(echo(X,4,6) ,4) ) +transpose(shuffle(X) ,7) ) |(arpeggio(X) +transpose(X,12) ) ) ,4,6) ,4,6) ) ,4) ,7) ) ,4) ) +transpose((transpose(transpose(echo(echo(X,4,6) ,4,6) ,-5) ,4) +transpose((((transpose(((echo((((transpose(X,4) +transpose(transpose(X,-7) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(transpose(X,-7) ,7) ) ,4,6) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose(shuffle(transpose(X,-7) ) ,7) ) ,4) |step(step(transpose(transpose((X+transpose(X,7) ) ,-5) ,-5) ,12) ,12) ) +arpeggio(transpose((X+X) ,-5) ) ) +transpose(step(((transpose(transpose(shuffle(arpeggio(X) ) ,-7) ,-7) +transpose(arpeggio(((X+transpose(X,7) ) |echo(transpose(echo(X,4,6) ,-5) ,4,6) ) ) ,4) ) +transpose(arpeggio(echo(shuffle(transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,-7) ) ,4,6) ) ,7) ) ,12) ,12) ) ,7) ) ,7) ) ,-5) +transpose(echo(transpose((transpose(transpose((step((step((X+transpose(X,12) ) ,12) |(transpose(X,-5) +transpose(transpose(X,-5) ,7) ) ) ,12) |(((transpose((X+transpose(X,12) ) ,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +((transpose(X,-5) +transpose(X,12) ) +step(transpose(X,-5) ,12) ) ) ) ,4) ,-5) |step(transpose(arpeggio(transpose(((shuffle(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,-7) ) ,-5) ,12) ) ,-5) ,4,6) ,12) ) ,7) ) +transpose(step((transpose((step((step(transpose(X,4) ,12) +transpose(arpeggio(transpose(arpeggio(X) ,4) ) ,7) ) ,12) +transpose(transpose(transpose(arpeggio(transpose(transpose(X,4) ,4) ) ,-7) ,4) ,12) ) ,-5) +transpose(((arpeggio(shuffle(step(transpose((transpose(X,-5) |transpose(X,4) ) ,-5) ,12) ) ) +transpose(echo(((transpose(echo((X+step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4,6) ,-7) +transpose(arpeggio(arpeggio(X) ) ,7) ) +transpose(shuffle(X) ,12) ) ,4,6) ,7) ) +transpose(((echo(arpeggio(X) ,4,6) |echo(arpeggio(X) ,4,6) ) +transpose(X,-7) ) ,7) ) ,12) ) ,12) ,4) ) +transpose(step(((transpose(transpose(transpose(((transpose(echo(arpeggio(transpose(transpose((X+transpose(X,7) ) ,-7) ,-5) ) ,4,6) ,-5) +transpose((((transpose(echo(transpose(arpeggio(X) ,-7) ,4,6) ,-7) +transpose(transpose(transpose(((X|X) +X) ,4) ,4) ,4) ) +transpose(X,7) ) +transpose((X+transpose((((echo((step(X,12) +transpose(X,7) ) ,4,6) +transpose(transpose(X,-5) ,12) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,4) ) +transpose(((transpose(X,-7) +transpose(transpose(arpeggio(X) ,-5) ,12) ) |transpose(((shuffle(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,-7) ) ,7) ) ,7) ) ,12) ) ,4) ) +transpose(transpose((((step(((transpose((X+transpose(X,12) ) ,-5) +transpose((transpose(X,-7) +transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) +transpose(transpose(step(shuffle(X) ,12) ,-7) ,4) ) +transpose(transpose(((transpose(transpose(X,-7) ,-7) +transpose(arpeggio(transpose(X,-5) ) ,4) ) +transpose(step(shuffle(X) ,12) ,7) ) ,-5) ,7) ) +transpose(((transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) +transpose(shuffle(transpose(step((X|X) ,12) ,-5) ) ,4) ) +transpose(transpose(((transpose(X,4) +transpose(X,7) ) +transpose(X,7) ) ,4) ,7) ) ,12) ) ,-5) ,7) ) ,-7) ,-7) ,-7) +transpose(((transpose(step(transpose(step(transpose(transpose((transpose(X,-5) +transpose(transpose(X,-5) ,12) ) ,-7) ,-5) ,12) ,-5) ,12) ,-5) +transpose((arpeggio(shuffle((((transpose((X+transpose(shuffle(X) ,12) ) ,-7) +transpose(transpose((arpeggio(shuffle(X) ) +transpose(echo(X,4,6) ,12) ) ,-7) ,12) ) +((transpose(transpose((transpose(X,-7) +transpose(shuffle(X) ,12) ) ,-5) ,-5) +transpose(step((shuffle(shuffle((X+X) ) ) +transpose(((shuffle(shuffle(X) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose((X+transpose(transpose(X,4) ,12) ) ,7) ) ,12) ) ,12) ,4) ) +transpose((step(((shuffle(X) +transpose(X,4) ) +transpose((((X|X) +transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,12) +transpose(arpeggio(X) ,12) ) ,7) ) ) +transpose(transpose(shuffle(echo((((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) |transpose(X,-7) ) ,4,6) ) ,-7) ,12) ) ) ) +transpose((transpose(shuffle((((arpeggio(transpose((X+transpose(X,12) ) ,-5) ) +transpose((((X+transpose(transpose(X,-7) ,4) ) +transpose((transpose(X,-7) +transpose(shuffle(X) ,7) ) ,7) ) +transpose((transpose(X,4) +transpose(transpose(X,-7) ,7) ) ,12) ) ,4) ) +transpose(transpose((transpose(X,4) +transpose((transpose(X,-5) |X) ,12) ) ,4) ,7) ) |echo(echo(echo(transpose(step(X,12) ,-7) ,4,6) ,4,6) ,4,6) ) ) ,-5) +transpose(echo((transpose(transpose((X+X) ,-5) ,-5) +(transpose(transpose(transpose(echo(X,4,6) ,-5) ,-5) ,-5) +transpose(transpose(((((X+transpose(X,12) ) +transpose((transpose(X,-7) +transpose(X,12) ) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,7) ) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,-7) ,7) ) ) ,4,6) ,12) ) ,7) ) ,4) ) +transpose(transpose(transpose((transpose((((transpose((X|X) ,-5) +transpose((X+transpose(X,7) ) ,-7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) ) +transpose(shuffle(X) ,12) ) ,-7) +transpose(arpeggio(((((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose((arpeggio(X) +transpose(transpose(X,4) ,12) ) ,12) ) +transpose((X+transpose(echo(X,4,6) ,7) ) ,12) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) +transpose(arpeggio(transpose(X,-5) ) ,12) ) ,4) ) +transpose(transpose(step(transpose(X,4) ,12) ,-5) ,7) ) +transpose(transpose(transpose(arpeggio(X) ,4) ,-7) ,7) ) ) ,12) ) ,4) ,-5) ,7) ) ,4) ) +transpose(transpose(arpeggio(((arpeggio(step(shuffle(echo((((((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose((arpeggio(X) +transpose((X+X) ,12) ) ,7) ) +transpose((X+transpose(transpose(X,-7) ,7) ) ,7) ) ,4,6) ) ,12) ) |transpose((arpeggio((step(transpose(X,-7) ,12) +transpose((X|step(X,12) ) ,7) ) ) +transpose(step((echo(((((transpose(X,-7) +transpose(X,4) ) +transpose(X,7) ) +transpose((((X+X) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose((X+X) ,7) ) ,7) ) ,4,6) |echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,4,6) ) ,12) ,7) ) ,-5) ) +transpose(shuffle((((step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,12) ) ,12) +transpose(echo(transpose(transpose(echo(X,4,6) ,-7) ,-5) ,4,6) ,4) ) +transpose((echo(((shuffle(transpose(X,-5) ) +transpose(transpose(X,-7) ,4) ) +transpose((X+transpose(transpose(X,-7) ,7) ) ,7) ) ,4,6) +transpose(transpose((arpeggio(X) |(X+transpose(X,12) ) ) ,-5) ,7) ) ,7) ) +echo(step(transpose((echo(transpose(X,4) ,4,6) +transpose((transpose(X,-7) +transpose((X+transpose(X,12) ) ,12) ) ,12) ) ,4) ,12) ,4,6) ) ) ,7) ) ) ,4) ,7) ) ,12) ,7) ) +transpose(transpose((((step(transpose(arpeggio(shuffle(((((arpeggio((((transpose(X,-7) +transpose((X+X) ,12) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ) +transpose(echo(echo(transpose(X,-5) ,4,6) ,4,6) ,7) ) ) +transpose(arpeggio(echo(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) ,4,6) ) ,7) ) +transpose(step(transpose(arpeggio(transpose(shuffle(X) ,-7) ) ,-5) ,12) ,4) ) +transpose(step(((transpose(transpose(echo(transpose(X,-7) ,4,6) ,-7) ,-5) |transpose((shuffle(X) +transpose(X,7) ) ,-5) ) +((shuffle(((X+transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ) |transpose(echo(transpose(X,-7) ,4,6) ,4) ) +transpose(transpose(transpose(step(echo(X,4,6) ,12) ,-7) ,4) ,12) ) ) ,12) ,7) ) +transpose((transpose(transpose(((transpose(step(X,12) ,-7) +transpose(echo((echo(X,4,6) |X) ,4,6) ,4) ) +transpose(((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(transpose(X,4) ,4) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) ,7) ) ,-7) ,-5) +transpose(arpeggio(((arpeggio(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,7) ) ) ) +transpose((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-5) +shuffle(arpeggio(transpose(X,-5) ) ) ) ,12) ) |transpose(((X|step(X,12) ) +shuffle(X) ) ,-5) ) ) ,12) ) ,12) ) ) ) ,-5) ,12) +transpose(echo((transpose((step((shuffle(shuffle((transpose(X,4) +transpose(transpose(X,4) ,7) ) ) ) +shuffle(transpose(((step((X+transpose(X,12) ) ,12) +transpose((X+transpose(step(X,12) ,7) ) ,4) ) +transpose(X,7) ) ,-5) ) ) ,12) +transpose(shuffle(transpose((shuffle(transpose((transpose(X,-7) +transpose(X,7) ) ,-7) ) |(transpose(transpose(X,-5) ,-5) +echo(X,4,6) ) ) ,-5) ) ,7) ) ,-5) +transpose(((((arpeggio(transpose(X,-5) ) +transpose((((X+transpose(arpeggio(X) ,7) ) +transpose(transpose(transpose(X,-5) ,-7) ,4) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) ,12) ) +transpose(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ,-7) ) +transpose((transpose(transpose(transpose(transpose(echo((X|X) ,4,6) ,-5) ,-7) ,-7) ,-5) |shuffle(transpose((X+transpose(X,12) ) ,-5) ) ) ,7) ) |((transpose(step((X+transpose(X,7) ) ,12) ,-5) +transpose(step(arpeggio((X+transpose((X+X) ,7) ) ) ,12) ,12) ) +transpose(echo(((shuffle(X) |transpose(X,-7) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(echo(X,4,6) ,7) ) ,12) ) ,4,6) ,7) ) ) ,7) ) ,4,6) ,4) ) +transpose((arpeggio(transpose(arpeggio((transpose(transpose(transpose(transpose(arpeggio(transpose(transpose(X,-5) ,4) ) ,-5) ,-7) ,-5) ,-7) +transpose((step(echo(transpose(transpose(((echo(step(X,12) ,4,6) +transpose(shuffle(X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,-7) ,-5) ,4,6) ,12) +transpose(transpose(step(transpose(X,-5) ,12) ,-5) ,7) ) ,12) ) ) ,4) ) +transpose(transpose((transpose((echo((((transpose(X,-7) |shuffle(transpose(X,4) ) ) +transpose(step(X,12) ,7) ) +transpose((((X+transpose((X+transpose(X,12) ) ,7) ) +transpose(X,12) ) +transpose(((X|X) +transpose(X,7) ) ,12) ) ,7) ) ,4,6) +transpose(transpose((transpose(X,-5) +transpose(echo(echo(X,4,6) ,4,6) ,12) ) ,-5) ,7) ) ,-5) +transpose((transpose(transpose(transpose(arpeggio(echo(X,4,6) ) ,-7) ,4) ,-7) +transpose((step((transpose(echo(X,4,6) ,-5) +transpose((arpeggio(((transpose(X,-5) +transpose(arpeggio(X) ,12) ) |transpose(step((X+X) ,12) ,-7) ) ) +transpose((arpeggio(X) +(step((X+transpose(X,7) ) ,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,12) ) ,12) ) ,12) +((step(transpose(((transpose(transpose(X,-5) ,-7) +transpose(arpeggio(transpose(X,-7) ) ,4) ) +transpose(((echo(X,4,6) +transpose(shuffle(X) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,-5) ,12) +transpose(transpose((transpose(X,-5) +transpose((((transpose((arpeggio(X) +transpose(X,7) ) ,-5) +transpose((transpose(transpose(X,-7) ,-7) +transpose(arpeggio(X) ,12) ) ,4) ) +transpose((X+transpose(echo(X,4,6) ,12) ) ,7) ) +transpose(shuffle(((X+transpose((transpose(X,-7) +step(X,12) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,12) ) ,7) ) ,-7) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ) ,7) ) ,12) ) ,4) ,12) ) ,7) ) +transpose(transpose(echo(arpeggio((step(arpeggio((echo(X,4,6) +transpose(arpeggio((X+transpose(X,12) ) ) ,7) ) ) ,12) +transpose(transpose(transpose(arpeggio((transpose((((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose(step(X,12) ,-7) ,12) ) ,4) +step(transpose(step(X,12) ,-5) ,12) ) ) ,-7) ,-5) ,12) ) ) ,4,6) ,-5) ,7) ) ,4) ,4) ) +transpose(transpose(transpose((step(((((arpeggio(shuffle(transpose((X+transpose(X,12) ) ,-7) ) ) +echo((arpeggio(transpose(X,-5) ) |transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ) ,4,6) ) |(((transpose(arpeggio(echo(X,4,6) ) ,-7) +transpose((((echo(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(shuffle(X) ,4) ) +transpose(arpeggio(X) ,7) ) ,4,6) +transpose(transpose(arpeggio((X+transpose(X,7) ) ) ,4) ,7) ) +transpose((X+transpose(arpeggio(X) ,12) ) ,4) ) +transpose(((((X+transpose(transpose(shuffle(X) ,-5) ,12) ) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) ,4) ) +transpose(((X+transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,12) ) ) ,7) ) ,7) ) ,4) ) +transpose((transpose((arpeggio((X+transpose(arpeggio(X) ,7) ) ) +(arpeggio(X) +transpose((X+transpose(X,12) ) ,7) ) ) ,-7) +transpose(shuffle(arpeggio((X|X) ) ) ,12) ) ,7) ) +transpose(shuffle((X+transpose(echo(X,4,6) ,7) ) ) ,12) ) ) +((transpose(step(transpose(transpose(transpose((transpose(X,-7) +transpose(X,12) ) ,-7) ,-7) ,-5) ,12) ,4) +transpose(transpose(arpeggio((X|X) ) ,-5) ,12) ) +transpose(((((arpeggio(step(X,12) ) +transpose((step((X+transpose(X,12) ) ,12) +transpose(transpose((X+transpose(X,7) ) ,-7) ,12) ) ,12) ) +transpose((transpose(((shuffle(X) +transpose(X,4) ) +transpose(((((X+transpose(echo(X,4,6) ,4) ) +transpose(arpeggio(step(X,12) ) ,7) ) +transpose((shuffle(transpose(X,-5) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ) ,-7) |transpose(echo((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(step(X,12) ,12) ) ,4,6) ,-7) ) ,7) ) +transpose(transpose(shuffle(echo(transpose(transpose(shuffle((X+transpose(X,12) ) ) ,-7) ,-7) ,4,6) ) ,-5) ,4) ) +transpose(echo(transpose(transpose(((transpose(X,-7) |X) +step(arpeggio(X) ,12) ) ,4) ,-5) ,4,6) ,7) ) ,7) ) ) +transpose(echo(arpeggio(transpose((transpose(((arpeggio(X) +transpose(transpose(X,-7) ,4) ) +transpose(shuffle(X) ,7) ) ,-7) +transpose((((shuffle((X|X) ) +transpose(((X|X) +transpose(X,-7) ) ,12) ) +transpose(transpose((transpose(X,-7) +transpose(arpeggio(X) ,12) ) ,-5) ,4) ) +transpose(step(shuffle((transpose(X,-7) +X) ) ,12) ,7) ) ,-5) ) ,4) ) ,4,6) ,7) ) ,12) +transpose(transpose(step(step((transpose((((X|X) |X) +transpose(transpose(X,-7) ,12) ) ,-5) +transpose(arpeggio(transpose(echo(X,4,6) ,-5) ) ,12) ) ,12) ,12) ,4) ,7) ) ,-7) ,-5) ,7) ) ,-5) ,-7)
random seed used was 241209255

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