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:
((echo(echo((((((transpose(((arpeggio(((step(X,12) |(X|X) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) +shuffle(step(echo(transpose(X,-7) ,4,6) ,12) ) ) |(transpose((transpose(X,-5) +transpose(transpose(X,4) ,7) ) ,4) |(transpose(X,4) +echo(X,4,6) ) ) ) ,4) |arpeggio(transpose(((transpose((X|transpose(X,4) ) ,-7) +transpose((arpeggio(X) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ,4) ) ) +transpose(arpeggio((((X+transpose(((X+transpose(X,12) ) +(X+X) ) ,4) ) +transpose(X,7) ) +transpose(((transpose((arpeggio(X) +echo(echo(X,4,6) ,4,6) ) ,-7) +((X+transpose((X+X) ,7) ) +transpose(transpose(transpose(X,4) ,4) ,12) ) ) +transpose(((((transpose(arpeggio(X) ,-7) +transpose((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose((X|(X|X) ) ,7) ) +transpose(((transpose(X,4) |step(X,12) ) +transpose((((X+X) |transpose(X,-7) ) |(X+X) ) ,7) ) ,12) ) +(((transpose(X,-5) +transpose((X|(arpeggio(X) +transpose((X+transpose(X,12) ) ,7) ) ) ,4) ) +transpose(transpose(X,-5) ,7) ) |(echo(X,4,6) |transpose(((X|X) |transpose(X,-7) ) ,-7) ) ) ) ,12) ) ,7) ) ) ,7) ) +transpose((echo(transpose((echo(X,4,6) +transpose(echo(transpose((X+transpose(X,12) ) ,-7) ,4,6) ,12) ) ,4) ,4,6) +shuffle((transpose(((transpose(X,-7) +transpose((X|X) ,12) ) |transpose(X,-7) ) ,4) +transpose((shuffle(transpose(X,-5) ) +transpose(echo(X,4,6) ,4) ) ,12) ) ) ) ,4) ) +transpose(transpose((arpeggio(((X+transpose(transpose((transpose(X,4) |X) ,4) ,7) ) +transpose(((transpose(X,4) +transpose(step(shuffle(X) ,12) ,4) ) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ,12) ) ) +step(transpose(step(transpose(transpose(X,4) ,-5) ,12) ,-5) ,12) ) ,-5) ,7) ) +transpose(((echo((step((((X+X) +transpose(X,-7) ) +transpose(X,12) ) ,12) |(step(((X+transpose(X,7) ) |X) ,12) +transpose((shuffle((X+transpose(X,12) ) ) +transpose(X,12) ) ,7) ) ) ,4,6) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((((X+transpose(X,4) ) +transpose((X|X) ,7) ) +transpose(transpose(X,4) ,12) ) +((step(transpose(X,-7) ,12) +transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ) +transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,7) ) ) ,7) ) +transpose(((((transpose((X+X) ,-5) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose((transpose(shuffle(X) ,4) |transpose(X,4) ) ,7) ) +transpose(((((transpose(X,-7) +transpose(echo(X,4,6) ,12) ) +echo(X,4,6) ) +transpose(transpose(step(X,12) ,-5) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) ,12) ) +transpose(((transpose(X,-5) +transpose(arpeggio(X) ,4) ) +transpose(arpeggio(step(X,12) ) ,7) ) ,-5) ) ,12) ) ,12) ) +transpose((((((transpose(((X|X) +(X|X) ) ,4) +transpose(transpose((X|(X+transpose(X,12) ) ) ,-5) ,7) ) +transpose(transpose(transpose(transpose(transpose(arpeggio(X) ,-5) ,4) ,-5) ,-7) ,12) ) |(transpose(X,-7) +(step(X,12) +transpose((X+X) ,12) ) ) ) |((shuffle(echo(transpose(transpose(X,-5) ,-5) ,4,6) ) +transpose(transpose((X|X) ,4) ,4) ) +transpose(step((transpose(step(transpose(X,-5) ,12) ,-5) +echo((X+X) ,4,6) ) ,12) ,7) ) ) +transpose(transpose((shuffle(((transpose(transpose(shuffle(X) ,-7) ,-5) |(step(step(X,12) ,12) +(transpose(X,4) |X) ) ) +transpose((transpose((transpose(X,-7) +shuffle((X+transpose(X,7) ) ) ) ,4) |transpose(shuffle(X) ,-5) ) ,7) ) ) |((((transpose(X,4) +((transpose(X,4) +X) |X) ) |(transpose(transpose(X,-5) ,-7) +transpose(((transpose(X,-5) |X) +shuffle(shuffle(X) ) ) ,7) ) ) +transpose(((((arpeggio((X+transpose(X,7) ) ) +transpose((X+X) ,4) ) +transpose(transpose(X,-7) ,7) ) |transpose(X,-7) ) +transpose(transpose(X,-7) ,4) ) ,7) ) +transpose(echo(transpose(transpose(X,4) ,4) ,4,6) ,12) ) ) ,-5) ,12) ) ,12) ) ,12) ) ,4,6) ,4,6) +transpose(transpose(((transpose((transpose((((shuffle(step(transpose((X|X) ,-5) ,12) ) +transpose(arpeggio(step(echo((((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) +transpose(transpose(X,-5) ,7) ) ,4,6) ,12) ) ,4) ) +transpose(((transpose(step((((transpose(X,-7) +transpose(step(X,12) ,4) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) |echo(step((X+transpose(X,12) ) ,12) ,4,6) ) ,12) ,-5) +transpose(echo(step(arpeggio((X+X) ) ,12) ,4,6) ,7) ) +(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) |transpose((transpose(transpose(X,-5) ,-5) +transpose(X,12) ) ,-7) ) ) ,7) ) +(echo((transpose(((((transpose(X,-5) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) |X) |transpose((shuffle(X) |X) ,-7) ) ,-7) +transpose(transpose(((X+transpose((X+X) ,7) ) |shuffle(((X|X) +transpose(X,-7) ) ) ) ,-5) ,12) ) ,4,6) +transpose(transpose(transpose(transpose((((echo(transpose((X|X) ,4) ,4,6) +echo(X,4,6) ) +transpose(transpose((X|X) ,-7) ,7) ) |((transpose((X+X) ,4) +transpose((transpose(X,-5) |(X|(X|X) ) ) ,4) ) +transpose((((X+X) +transpose(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4) ,4) ) +transpose(arpeggio(echo(X,4,6) ) ,7) ) ,7) ) ) ,-7) ,4) ,-5) ,12) ) ) ,-7) |transpose(arpeggio((transpose(transpose((arpeggio((echo(transpose(X,-7) ,4,6) |transpose(((X|X) +X) ,-7) ) ) +transpose(((step((((echo(X,4,6) +transpose((X+X) ,12) ) |transpose(X,-5) ) +transpose((X|X) ,12) ) ,12) +transpose(echo(transpose((transpose(X,-5) +transpose(transpose((X|X) ,-7) ,12) ) ,-7) ,4,6) ,4) ) +transpose(transpose((transpose(X,4) +transpose(X,7) ) ,-5) ,7) ) ,7) ) ,4) ,-5) |arpeggio(step(transpose(transpose(((arpeggio(X) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ,-5) ,12) ) ) ) ,-5) ) ,-5) +transpose(((echo(((transpose(shuffle(((((arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) +echo((arpeggio(transpose(X,-5) ) +transpose(((transpose(X,-7) +transpose(X,7) ) +(X|X) ) ,12) ) ,4,6) ) +transpose(arpeggio((((transpose(X,-5) +(transpose((X+transpose(X,7) ) ,-7) +transpose(X,-7) ) ) +transpose(transpose(X,-5) ,12) ) +transpose(((echo((X+transpose((X+transpose(X,7) ) ,7) ) ,4,6) +transpose(transpose(arpeggio(X) ,-5) ,7) ) +transpose(((shuffle(X) |transpose(transpose(X,-5) ,4) ) |echo((X+X) ,4,6) ) ,12) ) ,7) ) ) ,7) ) +transpose(transpose((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) |(transpose((step(X,12) +(X+transpose(X,12) ) ) ,-5) +(((X+transpose(X,4) ) +transpose(X,7) ) |X) ) ) ,4) ,4) ) +transpose((((step((transpose(transpose(X,4) ,4) +(transpose(X,-7) +transpose(transpose(X,-5) ,7) ) ) ,12) +transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ) ,7) ) +transpose(transpose(transpose(transpose(((transpose((X+X) ,-5) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) ,-5) ,-5) ,12) ) +((((step((X|X) ,12) +step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose((echo(X,4,6) |((transpose(X,-7) +transpose((X|X) ,4) ) +transpose(X,7) ) ) ,7) ) +transpose(shuffle((X+transpose(X,12) ) ) ,-5) ) +transpose(shuffle(((X|transpose((X+X) ,4) ) |arpeggio(X) ) ) ,7) ) ) ,7) ) ) ,-5) |(transpose((((((((((X|X) +transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose((X|X) ,7) ) |shuffle(X) ) +arpeggio(X) ) +transpose(transpose(((transpose(X,-5) +transpose((X|(X|X) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,-5) ,4) ) +transpose((step(transpose((X+X) ,4) ,12) +(transpose((X|X) ,4) |(echo((X+transpose(X,7) ) ,4,6) |transpose(X,-7) ) ) ) ,4) ) +transpose(shuffle((transpose(transpose(X,4) ,4) +(step(transpose(transpose(X,4) ,-5) ,12) +shuffle(X) ) ) ) ,7) ) |transpose(echo(step(transpose(transpose(X,-7) ,-7) ,12) ,4,6) ,4) ) ,-5) +transpose((step(transpose(transpose(X,-7) ,-7) ,12) +(((transpose(transpose(shuffle(step(X,12) ) ,4) ,-5) +transpose((step(X,12) +transpose((X+transpose(X,12) ) ,4) ) ,7) ) +(((echo(transpose(X,-5) ,4,6) +transpose((step(X,12) |transpose((X+X) ,-7) ) ,4) ) +transpose(transpose((X+X) ,4) ,7) ) +transpose((X+transpose(X,7) ) ,12) ) ) +((transpose(((X+X) +transpose(echo(transpose((X|X) ,-7) ,4,6) ,7) ) ,4) +transpose(((((X|((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(((step(X,12) +transpose(transpose(X,-5) ,12) ) |X) ,12) ) +transpose((arpeggio(X) +transpose(((transpose(X,4) +transpose((X|X) ,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose((step(X,12) |(((X+X) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ) ,7) ) ,7) ) +transpose(step((X|(X+X) ) ,12) ,7) ) ) ) ,12) ) ) +transpose(transpose(((((X|(X+X) ) |step(step(X,12) ,12) ) +transpose(transpose(transpose(echo(X,4,6) ,-7) ,-5) ,-5) ) +transpose(shuffle(transpose((X|(X|X) ) ,4) ) ,7) ) ,-7) ,7) ) ,4,6) +(echo(shuffle((((echo(transpose(transpose(transpose((X+transpose(X,7) ) ,-5) ,-5) ,4) ,4,6) +transpose(echo(step(transpose(X,-5) ,12) ,4,6) ,7) ) +transpose(arpeggio(transpose((echo(X,4,6) +transpose(((transpose(echo((X+X) ,4,6) ,-5) +step(arpeggio(X) ,12) ) +transpose(transpose(arpeggio(X) ,-5) ,12) ) ,7) ) ,4) ) ,4) ) +transpose(transpose(((transpose((transpose(X,-7) |(X+step(X,12) ) ) ,-7) +arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) |X) ) ) +transpose(((((X+transpose((X+transpose(X,7) ) ,12) ) +transpose(echo(step(transpose(X,4) ,12) ,4,6) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose((X+transpose(transpose(transpose(X,-7) ,-7) ,12) ) ,12) ) ,7) ) ,-5) ,7) ) ) ,4,6) |((transpose(((transpose(transpose(((X+transpose(X,-5) ) +transpose(((X+transpose(X,12) ) +transpose((X+X) ,7) ) ,12) ) ,-5) ,-7) +transpose(arpeggio((step((((X|X) +transpose(X,4) ) +transpose(X,7) ) ,12) +(echo(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,4) ,4,6) +(arpeggio(X) +X) ) ) ) ,12) ) +shuffle((((shuffle(X) |(transpose((X+transpose(X,12) ) ,-5) +((X+transpose(X,12) ) +transpose(X,-7) ) ) ) +transpose(transpose(X,-7) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) ) ) ,4) +transpose(transpose((transpose(((transpose(X,4) +transpose(echo((transpose(X,-5) +transpose(transpose(X,-5) ,7) ) ,4,6) ,7) ) +transpose(transpose((transpose(X,-5) +X) ,-7) ,12) ) ,-7) |(transpose((X+transpose(X,12) ) ,-5) |(((transpose(X,4) +transpose(((X+transpose(X,12) ) +X) ,4) ) +transpose((X|X) ,7) ) |echo(transpose((X+transpose(X,7) ) ,-7) ,4,6) ) ) ) ,-5) ,7) ) +transpose(transpose(transpose((transpose(((X+X) +transpose((X|X) ,7) ) ,-5) +transpose(transpose(X,-7) ,12) ) ,4) ,4) ,-5) ) ) ) +transpose((transpose((transpose(shuffle((step(transpose(transpose(shuffle(transpose(X,-7) ) ,4) ,-7) ,12) +transpose((echo((transpose(X,-7) +transpose(X,7) ) ,4,6) |transpose((X+X) ,-7) ) ,7) ) ) ,-5) +transpose((arpeggio((((transpose(shuffle((X|X) ) ,4) +transpose(step(echo(transpose(transpose(X,-5) ,4) ,4,6) ,12) ,4) ) +transpose(transpose(transpose(echo(X,4,6) ,-7) ,-5) ,7) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,-5) ,-7) ,7) ) ) +(transpose((transpose(arpeggio(transpose(X,-7) ) ,-5) +(echo(X,4,6) |(X+transpose(X,12) ) ) ) ,-7) |(echo((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X+X) ) ,-5) +step(((X+transpose(X,12) ) +transpose((X+X) ,12) ) ,12) ) ,4,6) |(shuffle((X+transpose((X+X) ,7) ) ) |(transpose(X,4) +(((transpose(X,-5) +transpose(X,12) ) +transpose(shuffle(X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ) ) ) ) ,12) ) ,4) |arpeggio((((arpeggio(((X+transpose((X+transpose(X,12) ) ,7) ) |(echo(transpose(transpose(X,-7) ,-5) ,4,6) +transpose((((step(X,12) +arpeggio(X) ) +transpose(step((X+(X|X) ) ,12) ,4) ) +transpose(((((transpose(X,-7) +transpose(X,4) ) +transpose((X|X) ,7) ) +transpose((transpose(X,-5) +X) ,4) ) +transpose(X,7) ) ,7) ) ,12) ) ) ) +transpose(transpose((((step(X,12) +transpose(X,-5) ) |(X+step(step(X,12) ,12) ) ) +transpose((arpeggio((X+transpose(X,12) ) ) +step(transpose(transpose(X,-5) ,4) ,12) ) ,4) ) ,4) ,12) ) +transpose(((transpose((transpose(transpose(X,-5) ,4) +transpose(shuffle(X) ,7) ) ,-5) +((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) +echo(X,4,6) ) ) +transpose(transpose(((transpose((X+X) ,4) +transpose(transpose(X,-7) ,7) ) +transpose(shuffle(transpose((X+transpose(X,7) ) ,-5) ) ,7) ) ,-7) ,12) ) ,-5) ) +arpeggio(transpose(transpose(transpose(transpose((arpeggio((X+transpose(X,12) ) ) +(transpose(X,-5) +X) ) ,4) ,-7) ,4) ,4) ) ) ) ) ,12) ) ,4) ) +transpose(transpose(((((transpose(transpose(shuffle(transpose(transpose(((X+X) |(transpose(X,4) +(X+transpose(X,-5) ) ) ) ,-7) ,-7) ) ,4) ,-7) +transpose(transpose(transpose(step(arpeggio((arpeggio(transpose((X|(X+X) ) ,4) ) +shuffle(((transpose((arpeggio(X) |(X+X) ) ,4) +transpose((X+transpose(X,7) ) ,12) ) |step(X,12) ) ) ) ) ,12) ,-5) ,-5) ,4) ) +transpose(transpose((transpose((echo((shuffle((transpose(transpose(X,-5) ,-5) |(((transpose(X,4) |(X|X) ) |(((X+transpose(X,4) ) +transpose(X,7) ) |arpeggio(X) ) ) +transpose(step(X,12) ,7) ) ) ) +transpose(arpeggio(((transpose(X,-5) +transpose(transpose(X,-7) ,12) ) +transpose((((arpeggio(transpose(X,-5) ) +transpose(transpose(step(X,12) ,-7) ,4) ) +transpose(((X+transpose(X,12) ) +transpose(step(X,12) ,7) ) ,7) ) +step(X,12) ) ,7) ) ) ,12) ) ,4,6) +transpose(arpeggio(transpose((echo(arpeggio((X|X) ) ,4,6) +transpose(transpose((X+step(X,12) ) ,4) ,12) ) ,-7) ) ,7) ) ,-5) +transpose(transpose(((((step(arpeggio((echo(X,4,6) +transpose(X,7) ) ) ,12) +transpose((arpeggio(X) +(X+transpose(X,12) ) ) ,12) ) +transpose(echo((X+X) ,4,6) ,4) ) +transpose((((X+transpose(X,12) ) |((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +transpose(shuffle(transpose(X,-5) ) ,12) ) ,7) ) +transpose((transpose((X+transpose((X|X) ,7) ) ,4) +((transpose(X,-5) |echo(shuffle(X) ,4,6) ) |(transpose(transpose(X,4) ,-7) +transpose(transpose((X+transpose(X,12) ) ,-5) ,12) ) ) ) ,12) ) ,4) ,-5) ) ,-7) ,7) ) +transpose(transpose(((((shuffle(((transpose(transpose(X,4) ,-7) +transpose((X|X) ,7) ) +transpose((transpose(X,4) |transpose(X,4) ) ,4) ) ) +transpose(((((((transpose(transpose(((X|X) +transpose((X+transpose(X,12) ) ,12) ) ,4) ,-7) +(transpose(X,4) +transpose((((X+transpose(X,12) ) +transpose((X|X) ,12) ) +transpose(transpose(shuffle(X) ,-7) ,12) ) ,7) ) ) +transpose(transpose(step(X,12) ,4) ,12) ) +transpose((shuffle(transpose(((transpose(X,-7) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+X) ,7) ) ,-5) ) +transpose((transpose(echo((X+transpose(X,12) ) ,4,6) ,-7) |echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4,6) ) ,12) ) ,4) ) +transpose(transpose(transpose(shuffle(arpeggio((arpeggio((X+X) ) +X) ) ) ,4) ,4) ,7) ) +transpose(step(transpose(transpose(transpose((X+transpose(transpose(X,-7) ,12) ) ,-5) ,-5) ,4) ,12) ,4) ) +transpose((transpose((shuffle(echo(transpose(X,4) ,4,6) ) +transpose(shuffle((X+X) ) ,12) ) ,-5) |(echo((((transpose(X,4) +((((X|X) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +transpose(shuffle(echo(X,4,6) ) ,12) ) ) +(arpeggio((X+X) ) +((echo(X,4,6) +(X+X) ) +(X+X) ) ) ) |echo(transpose(step(transpose(X,-5) ,12) ,4) ,4,6) ) ,4,6) +transpose(echo((shuffle(step(X,12) ) +transpose(X,12) ) ,4,6) ,7) ) ) ,7) ) ,4) ) +transpose(transpose(arpeggio((transpose(transpose(X,4) ,-5) +transpose(transpose(transpose(((X+transpose(X,7) ) +transpose(shuffle(X) ,7) ) ,4) ,4) ,7) ) ) ,4) ,7) ) +transpose((echo(((transpose(transpose(transpose(X,-5) ,-5) ,-7) |echo((X+transpose(transpose((X|X) ,-7) ,7) ) ,4,6) ) +transpose(transpose((((transpose(shuffle(step(arpeggio(X) ,12) ) ,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(echo(transpose(transpose((X+transpose(arpeggio(X) ,12) ) ,4) ,-7) ,4,6) ,4) ) +transpose(transpose(((X+X) +((transpose(X,4) |arpeggio(X) ) +(X+(X+X) ) ) ) ,-7) ,7) ) ,4) ,12) ) ,4,6) +transpose(transpose((((step(arpeggio(((X+transpose(transpose(X,-5) ,4) ) +transpose(shuffle(X) ,7) ) ) ,12) +transpose(((((((X+X) |X) +transpose((X|X) ,4) ) +transpose((X+(X+transpose(X,12) ) ) ,7) ) +(X|X) ) |echo(transpose((X+transpose(X,12) ) ,4) ,4,6) ) ,4) ) +transpose(transpose(step(X,12) ,-7) ,7) ) |arpeggio(echo(arpeggio(arpeggio(X) ) ,4,6) ) ) ,4) ,7) ) ,4) ) +transpose(((((step((X|X) ,12) +transpose(transpose(shuffle(X) ,4) ,7) ) +transpose((((echo(X,4,6) +(X|X) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,7) ) |echo((shuffle(X) +(X|X) ) ,4,6) ) ,7) ) +transpose(transpose((echo((X|X) ,4,6) |transpose(X,-7) ) ,4) ,-5) ) +transpose((step(step(X,12) ,12) +transpose(transpose(((transpose(((X+transpose(X,12) ) |transpose(shuffle(X) ,4) ) ,-5) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) ) +transpose(shuffle(arpeggio(((X+transpose(X,4) ) +transpose((shuffle(X) +shuffle(X) ) ,7) ) ) ) ,7) ) ,4) ,12) ) ,4) ) ,7) ) ,-5) ,4) ) +transpose(transpose(((transpose(((transpose(((X+X) +transpose(transpose(arpeggio(X) ,-7) ,7) ) ,4) +transpose((transpose(step(X,12) ,4) |step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) ) ,7) ) |(transpose((X+transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ,4) +transpose(echo((((X|X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,4,6) ,7) ) ) ,4) +arpeggio(transpose(((shuffle(transpose((shuffle(X) +transpose(echo(X,4,6) ,7) ) ,-7) ) +((((X+X) +shuffle(X) ) +transpose(step(shuffle(transpose(X,-5) ) ,12) ,12) ) |transpose((transpose(X,-5) +transpose(X,-5) ) ,-7) ) ) +arpeggio(transpose(transpose(((((X+transpose(X,12) ) +transpose((X|X) ,12) ) +transpose(transpose(transpose(X,-7) ,-7) ,12) ) +((echo(X,4,6) +transpose(transpose(echo(X,4,6) ,-5) ,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ) ,-7) ,-7) ) ) ,-7) ) ) |((shuffle(arpeggio(echo(((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(transpose(step((X+transpose(X,7) ) ,12) ,-5) ,4) ) +transpose(((transpose(X,-7) +transpose(transpose(X,-7) ,4) ) +transpose(((step(X,12) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) |((X+(X|X) ) +transpose(X,7) ) ) +transpose((transpose(((X+transpose((X+transpose(step(X,12) ,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) |(shuffle(arpeggio((X|X) ) ) |transpose(((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ) ) ,7) ) ,4,6) ) ) |transpose(step((X+transpose(X,-5) ) ,12) ,4) ) +transpose((echo((((X+X) |transpose((X+transpose(X,12) ) ,-7) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ,4,6) +transpose(((arpeggio((arpeggio(transpose(X,-7) ) +transpose(transpose(shuffle(X) ,4) ,7) ) ) +transpose(transpose((echo((X+transpose((X+X) ,7) ) ,4,6) +transpose(transpose((transpose(X,4) +X) ,-5) ,12) ) ,-5) ,4) ) +transpose(step(step((X+transpose(X,12) ) ,12) ,12) ,7) ) ,12) ) ,-7) ) ) ,4) ,7) ) ,-7) ,7) ) ,4) ,12) ) +transpose(transpose(step((((transpose(((echo(shuffle(((X+transpose(X,12) ) +transpose(transpose(transpose(transpose(X,-7) ,4) ,-5) ,12) ) ) ,4,6) +transpose(echo(transpose((((echo((X+transpose(X,12) ) ,4,6) +transpose(((X|(X+X) ) +transpose(X,4) ) ,4) ) +transpose((step(X,12) +transpose(transpose(X,-7) ,7) ) ,7) ) |transpose(transpose(X,-5) ,-7) ) ,4) ,4,6) ,4) ) +transpose(transpose(step(((echo(X,4,6) +transpose(transpose(X,-5) ,12) ) |transpose(X,-5) ) ,12) ,4) ,7) ) ,-5) +(((shuffle(shuffle(transpose(((transpose(X,4) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,4) ) ) +transpose((((((arpeggio(X) +echo(X,4,6) ) +transpose((X+X) ,4) ) +transpose(transpose(X,-7) ,7) ) +(((X+X) +transpose(X,12) ) +transpose(transpose(X,-7) ,7) ) ) |transpose(((X|X) |(X|X) ) ,-5) ) ,4) ) +transpose(transpose(transpose(transpose((shuffle(X) +transpose((X|X) ,12) ) ,-7) ,-7) ,4) ,7) ) |transpose(((echo((X+transpose(X,7) ) ,4,6) +transpose(step(X,12) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) ) |transpose(((transpose(step(arpeggio(((X+transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,12) ,4) +transpose(shuffle(transpose(echo((X|X) ,4,6) ,-7) ) ,12) ) +(((X|X) +(transpose(step(X,12) ,4) +X) ) +((X+transpose((echo(X,4,6) |X) ,4) ) +transpose(transpose((echo(X,4,6) +arpeggio(X) ) ,4) ,7) ) ) ) ,-7) ) +transpose(((echo(echo(arpeggio(shuffle(transpose(X,-5) ) ) ,4,6) ,4,6) +transpose(echo((((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) +(step(transpose(X,-7) ,12) +transpose(X,7) ) ) ,4,6) ,4) ) +transpose((X+X) ,7) ) ,4) ) ,12) ,4) ,4) )
random seed used was 118890740

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