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 17 generations the expression "X" became this:
((((transpose(transpose(arpeggio(((step(arpeggio(X) ,12) +transpose(arpeggio(X) ,12) ) |(step(X,12) +transpose(step(shuffle(X) ,12) ,7) ) ) ) ,-5) ,-7) +transpose(transpose(transpose(transpose(step((transpose(X,-5) +transpose(transpose(X,4) ,7) ) ,12) ,-7) ,-7) ,4) ,12) ) |((((arpeggio(transpose((transpose(transpose(shuffle(transpose(X,-5) ) ,4) ,-5) +transpose(transpose((echo(shuffle(transpose((X+transpose(X,7) ) ,4) ) ,4,6) |(transpose(X,-7) |transpose(transpose(X,-7) ,-7) ) ) ,-5) ,7) ) ,-7) ) +transpose((transpose(arpeggio(transpose(((transpose((X+transpose(X,12) ) ,4) +transpose(step(arpeggio(arpeggio(X) ) ,12) ,4) ) +transpose(X,7) ) ,-7) ) ,-5) +transpose(transpose((((((X+transpose(transpose(arpeggio(X) ,4) ,4) ) +transpose(step((X+X) ,12) ,7) ) |(transpose((X|X) ,-5) +transpose((transpose((X|X) ,-5) +transpose((X+X) ,7) ) ,12) ) ) +transpose((((transpose(step(X,12) ,4) |transpose((X+transpose(X,12) ) ,-7) ) +transpose(transpose((transpose(X,4) +transpose(X,7) ) ,4) ,4) ) +transpose((((X+transpose(X,7) ) |X) +transpose(arpeggio(step(X,12) ) ,12) ) ,7) ) ,4) ) +transpose(((X+transpose((transpose(transpose(X,4) ,-7) +transpose(transpose(transpose(X,-7) ,4) ,12) ) ,4) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) ,7) ) ,-7) ,7) ) ,12) ) +transpose(step(transpose(arpeggio(((((transpose((transpose((X|X) ,4) +transpose(transpose(X,4) ,-5) ) ,-5) +transpose(echo(((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,7) ) ,4,6) ,4) ) +transpose((transpose(step(X,12) ,-5) +transpose(transpose(arpeggio((transpose(X,-5) |transpose(X,-5) ) ) ,-7) ,7) ) ,7) ) |transpose(((X|X) +transpose((transpose(X,-7) +X) ,7) ) ,-7) ) +transpose((transpose(transpose(transpose((step(X,12) +transpose(X,4) ) ,-5) ,-7) ,-5) +transpose(step((transpose(transpose(X,-7) ,-7) |shuffle(X) ) ,12) ,12) ) ,12) ) ) ,-5) ,12) ,4) ) +transpose(transpose(((((((transpose(X,-5) |X) +transpose((X+transpose(X,12) ) ,12) ) +transpose(transpose((X+transpose((X|X) ,12) ) ,-5) ,12) ) |transpose(transpose(step(X,12) ,-7) ,-5) ) +transpose(((echo(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) ,4) ,4,6) +transpose(transpose((((transpose(X,-7) +transpose(transpose(X,4) ,12) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,4) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4) ,7) ) +transpose(step(echo(transpose((X+transpose(X,12) ) ,-5) ,4,6) ,12) ,12) ) ,4) ) +transpose(echo(echo(transpose(((X+((X+transpose(X,4) ) +transpose(X,7) ) ) +X) ,4) ,4,6) ,4,6) ,7) ) ,4) ,7) ) +transpose(arpeggio((step(((shuffle(X) |((X|X) +transpose(shuffle(X) ,12) ) ) |(((X+X) +transpose((X|X) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,12) +transpose(transpose((echo(((echo(transpose(transpose(X,4) ,4) ,4,6) +transpose((echo((((X+transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4,6) +transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) ,4) ) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) ,4,6) +transpose(((shuffle(transpose((X+transpose(X,12) ) ,-5) ) +transpose(((transpose(X,-5) +transpose(step((X+X) ,12) ,4) ) +transpose(transpose((X+X) ,4) ,7) ) ,12) ) +transpose(transpose(transpose(step(X,12) ,4) ,-7) ,12) ) ,12) ) ,4) ,7) ) ) ,7) ) ) |step((((shuffle(transpose((transpose(echo((X+transpose(transpose(step(X,12) ,-5) ,12) ) ,4,6) ,4) +transpose((transpose(X,-5) +transpose((((X+transpose(X,12) ) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ,12) ) ,-5) ) +transpose(((((((((transpose(echo(X,4,6) ,4) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) +transpose((((X|X) +transpose(transpose(X,-7) ,12) ) +arpeggio((transpose(echo(X,4,6) ,-7) +transpose((X|X) ,7) ) ) ) ,7) ) |transpose(transpose(((step(((X+transpose(X,7) ) +transpose((X|X) ,7) ) ,12) +transpose(transpose(transpose(X,-5) ,-7) ,4) ) +transpose(step(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,7) ) ,-5) ,-5) ) +transpose((shuffle(((arpeggio(transpose(X,4) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,4) ) +transpose((transpose(X,4) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ) +echo(transpose((X+transpose(X,7) ) ,-5) ,4,6) ) ,4) ) +transpose(echo((((X|X) +transpose(X,-7) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ,4,6) ,7) ) |(transpose(step(shuffle((X|X) ) ,12) ,4) +(transpose((transpose((X+transpose(X,12) ) ,-7) |step(transpose(shuffle(X) ,4) ,12) ) ,-7) +transpose(transpose(transpose(transpose(transpose(X,4) ,-7) ,-7) ,4) ,7) ) ) ) +transpose(echo(step((transpose(transpose(transpose(X,4) ,-7) ,-5) +transpose(transpose((X+transpose(X,7) ) ,-7) ,-5) ) ,12) ,4,6) ,4) ) +transpose(transpose((((transpose(transpose(transpose(X,-7) ,-7) ,4) +transpose(transpose(arpeggio(transpose(shuffle(X) ,4) ) ,4) ,4) ) +transpose((echo(X,4,6) |(X|X) ) ,7) ) +transpose(((((transpose(transpose(X,-7) ,4) +transpose((transpose(X,-5) |X) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(transpose(X,-7) ,7) ) +transpose(transpose(shuffle(echo(transpose(X,-7) ,4,6) ) ,-5) ,7) ) ,7) ) ,-5) ,7) ) ,4) ) +transpose(transpose(transpose(transpose(shuffle(arpeggio(((X+transpose(X,12) ) +transpose(X,12) ) ) ) ,-7) ,-5) ,-5) ,7) ) +transpose((transpose(arpeggio(transpose((step(X,12) +((X+transpose(X,12) ) +echo(X,4,6) ) ) ,4) ) ,4) |echo(step(arpeggio(((transpose((((X|X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,4) +transpose((transpose(echo(X,4,6) ,-5) +transpose(shuffle(X) ,12) ) ,7) ) |transpose(((X|X) +transpose(step(X,12) ,7) ) ,4) ) ) ,12) ,4,6) ) ,7) ) ,12) ) |(step(transpose((transpose(transpose(transpose(X,-5) ,-5) ,4) +transpose(((transpose(X,4) |echo(arpeggio(X) ,4,6) ) +transpose(transpose(X,-5) ,12) ) ,12) ) ,-5) ,12) +transpose((step(step(((shuffle(((((echo(X,4,6) +transpose(X,12) ) |transpose(transpose(X,4) ,-7) ) +transpose((((shuffle(X) |arpeggio(transpose(X,-5) ) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) |((transpose((X+transpose(X,12) ) ,4) +transpose((X+X) ,4) ) +transpose(shuffle(transpose(step(X,12) ,-7) ) ,7) ) ) ,12) ) +transpose((transpose((transpose(X,-5) +transpose(transpose(X,4) ,12) ) ,4) +transpose(echo(transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ,4,6) ,12) ) ,12) ) ) +transpose(shuffle(arpeggio(transpose(((arpeggio(transpose(X,4) ) +transpose(arpeggio(X) ,4) ) +transpose((shuffle(X) |(transpose(X,-5) |X) ) ,7) ) ,-7) ) ) ,12) ) +transpose(echo(((((((step(X,12) +X) |echo(((shuffle(X) +transpose(X,12) ) +transpose((X|X) ,4) ) ,4,6) ) +transpose((X+transpose(X,7) ) ,12) ) |((((X+transpose(X,7) ) +transpose(shuffle(step(X,12) ) ,4) ) +transpose(((X+transpose(X,12) ) |transpose(arpeggio(X) ,4) ) ,7) ) +transpose(transpose(transpose(transpose(X,4) ,-7) ,-7) ,12) ) ) +transpose(transpose((transpose(transpose((transpose(X,-7) |echo(X,4,6) ) ,-5) ,-5) +transpose(transpose(transpose(shuffle(step((X+transpose(X,12) ) ,12) ) ,-7) ,-5) ,7) ) ,4) ,12) ) |transpose(echo((transpose(((X|X) +transpose(transpose(X,-5) ,7) ) ,4) +transpose(step(echo(X,4,6) ,12) ,12) ) ,4,6) ,-7) ) ,4,6) ,12) ) ,12) ,12) +transpose(((transpose(((echo(transpose(transpose(transpose(X,-7) ,-7) ,-5) ,4,6) +transpose(transpose(((X+(X+X) ) |transpose(X,-5) ) ,4) ,4) ) +transpose(transpose(((X|transpose(shuffle(X) ,-5) ) |(X+transpose((transpose(X,-5) +transpose(transpose(X,4) ,7) ) ,7) ) ) ,4) ,7) ) ,-7) +transpose((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(transpose((arpeggio(((transpose(X,-7) +transpose(X,4) ) +transpose((X+X) ,7) ) ) +((X+transpose(transpose(X,-5) ,12) ) +transpose(X,7) ) ) ,-5) ,4) ,-5) ) ,7) ) |transpose(((((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(X,12) ) +transpose((step(X,12) +transpose(echo((X|X) ,4,6) ,12) ) ,4) ) +transpose(arpeggio((X|X) ) ,7) ) +transpose(arpeggio((transpose(X,-7) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-7) ) ,-7) ) ,-5) ) ,12) ) )
random seed used was 16 EXPR = ((transpose((((((arpeggio(X) +transpose(X,12) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +X) |transpose(transpose(X,-5) ,-7) ) ,7) ) +transpose((((((transpose(transpose(transpose(X,4) ,-7) ,4) +transpose(transpose(X,-5) ,12) ) +transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ) ,4) ) +transpose(transpose(((X|X) +transpose((arpeggio(X) +(X|X) ) ,12) ) ,4) ,7) ) +transpose(((transpose(transpose(X,-7) ,-5) +transpose(arpeggio(step(X,12) ) ,-5) ) +transpose((transpose(((X+transpose(X,7) ) |X) ,-7) |shuffle(X) ) ,12) ) ,12) ) +transpose(transpose((echo(shuffle(X) ,4,6) +transpose(transpose(transpose(echo(step(X,12) ,4,6) ,-7) ,-5) ,12) ) ,-5) ,7) ) ,12) ) +transpose((transpose(transpose((X+transpose(X,12) ) ,4) ,-7) |step((transpose(shuffle((X|transpose(X,-5) ) ) ,-7) |shuffle(transpose(X,-5) ) ) ,12) ) ,4) ) +transpose(arpeggio(((transpose(transpose(transpose(X,4) ,-7) ,-5) +transpose(transpose((step((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) |X) ,12) +transpose(transpose((transpose(transpose(X,-5) ,-5) +transpose((step(X,12) |transpose(X,4) ) ,7) ) ,4) ,12) ) ,-7) ,4) ) +transpose((((shuffle(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(transpose(transpose(transpose((X|X) ,-7) ,4) ,-7) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) |shuffle((X+transpose(X,7) ) ) ) ,7) ) ) ,7) ) ,-5) +transpose((arpeggio(transpose(transpose((((transpose(transpose(arpeggio(X) ,-7) ,-7) +transpose(transpose(transpose((transpose(X,-5) +transpose(X,7) ) ,-7) ,4) ,12) ) +shuffle(transpose((((transpose(X,-5) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) +transpose(transpose(X,4) ,12) ) ,4) ) ) +transpose(echo(echo(((X+X) +transpose(transpose(transpose(X,-5) ,-5) ,12) ) ,4,6) ,4,6) ,-5) ) ,4) ,-7) ) +transpose(arpeggio(echo((((transpose((transpose(X,4) |arpeggio(X) ) ,4) +transpose(transpose(transpose(step(X,12) ,4) ,-5) ,12) ) +transpose(step((((arpeggio(step(transpose(transpose(X,4) ,4) ,12) ) +transpose(transpose((transpose(transpose(X,-7) ,-7) |X) ,4) ,4) ) +transpose(arpeggio(((echo(X,4,6) +transpose((X+transpose(transpose(X,4) ,12) ) ,4) ) +transpose((transpose(X,-7) |transpose(X,-7) ) ,7) ) ) ,7) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,12) ) ,12) ,12) ) +transpose(transpose(transpose(((transpose(X,4) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |shuffle(X) ) +transpose(echo(X,4,6) ,12) ) ,4) ) +transpose((transpose(transpose(X,-5) ,-5) +X) ,7) ) ,-7) ,-7) ,12) ) ,4,6) ) ,7) ) ,7) ) |transpose(transpose((((transpose(((arpeggio(shuffle(X) ) |(echo((X|X) ,4,6) +transpose(((((X|X) +transpose(transpose(X,-5) ,7) ) +transpose(echo(transpose(X,4) ,4,6) ,4) ) +transpose(((transpose(X,-7) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) ,7) ) ) |arpeggio(X) ) ,-5) +(step(transpose(X,-7) ,12) |(transpose(step(arpeggio((X|X) ) ,12) ,4) |(transpose(X,4) +transpose(arpeggio(X) ,12) ) ) ) ) +transpose(transpose(transpose(step(echo(X,4,6) ,12) ,-5) ,4) ,12) ) +transpose(transpose(((transpose((echo((X+transpose(transpose(X,-7) ,12) ) ,4,6) |transpose(echo(X,4,6) ,-5) ) ,-5) |(transpose(((X+transpose(transpose(X,-7) ,7) ) |(arpeggio(X) +transpose(echo(X,4,6) ,7) ) ) ,-5) +transpose(transpose(echo((X+transpose(X,12) ) ,4,6) ,-7) ,7) ) ) +transpose(transpose(((X+X) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,-5) ,12) ) ,4) ,12) ) ,-5) ,-5) )
random seed used was 0 EXPR = (transpose((((((shuffle(transpose(transpose(shuffle(X) ,4) ,-5) ) +transpose(transpose(step(step(transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,-7) ,12) ,12) ,4) ,7) ) +transpose(echo((echo((transpose(X,4) +transpose(echo(X,4,6) ,12) ) ,4,6) +transpose(echo(X,4,6) ,7) ) ,4,6) ,12) ) |step(((arpeggio(transpose((transpose(((X+transpose(X,12) ) |X) ,-7) |transpose(echo(X,4,6) ,-7) ) ,-7) ) |(arpeggio((transpose((X+(X+transpose(X,7) ) ) ,-7) |(transpose(transpose(X,4) ,-5) +((shuffle(X) +transpose(step(X,12) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) ) |(((transpose(X,4) +transpose((step(X,12) +transpose(step(X,12) ,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(transpose((X|X) ,4) ,-7) ,12) ) ) ) +transpose(transpose(echo(transpose(((X|X) +transpose(X,12) ) ,-7) ,4,6) ,-5) ,12) ) ,12) ) +transpose(shuffle(shuffle(transpose((echo(((transpose((X|(X+transpose(X,12) ) ) ,-7) +transpose((X+transpose((X|X) ,-5) ) ,7) ) |(((((X+transpose(X,7) ) +transpose(transpose(transpose(X,4) ,-5) ,4) ) +transpose(echo(X,4,6) ,7) ) |X) +step((arpeggio(transpose(X,-5) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ) ,4,6) +transpose(echo((((transpose(((arpeggio(X) +transpose(step(X,12) ,4) ) +transpose(step(X,12) ,7) ) ,4) +transpose(transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,-7) ,7) ) |arpeggio(X) ) +transpose((((X+transpose((shuffle((X+X) ) +transpose(arpeggio(X) ,12) ) ,12) ) +transpose((shuffle((X+X) ) |echo(echo((X|X) ,4,6) ,4,6) ) ,4) ) +transpose((((X+X) +transpose(((X|(X+X) ) +transpose(transpose(X,-7) ,7) ) ,7) ) +echo((X+((step(X,12) +transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ) ,7) ) ,12) ) ,4,6) ,12) ) ,-5) ) ) ,7) ) +(transpose(((transpose(transpose(step(echo(transpose(((X+transpose(X,12) ) |X) ,4) ,4,6) ,12) ,-5) ,4) |(echo((transpose((X|X) ,-5) |((transpose(echo(transpose(X,-7) ,4,6) ,-5) +transpose((((X|X) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ) ,4,6) +transpose(echo((arpeggio(X) +transpose(((X+transpose(X,12) ) |transpose(X,-5) ) ,-5) ) ,4,6) ,7) ) ) +transpose((transpose(((transpose(((X+(X|X) ) +shuffle(transpose(X,-5) ) ) ,4) +transpose(transpose(transpose(X,-7) ,-7) ,4) ) +transpose((((echo(transpose(X,-5) ,4,6) +transpose((transpose(X,-7) +transpose((X|X) ,12) ) ,7) ) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) |((X+transpose(transpose((X|X) ,-7) ,12) ) |step((echo(X,4,6) +transpose(step(X,12) ,12) ) ,12) ) ) ,7) ) ,-7) |(transpose(X,4) |transpose(shuffle((X|(X+transpose(transpose(X,4) ,12) ) ) ) ,4) ) ) ,12) ) ,-7) +transpose(transpose((echo((((transpose(transpose(transpose(transpose(X,-7) ,-7) ,-7) ,-5) |arpeggio(transpose(X,-5) ) ) |arpeggio(transpose(X,-5) ) ) +transpose(transpose(arpeggio(echo(transpose(transpose((transpose(transpose(X,-5) ,-5) |((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,-5) ,4) ,4,6) ) ,4) ,7) ) ,4,6) |((((((transpose(X,-5) |(transpose(X,4) +X) ) +(X|X) ) +transpose(transpose(X,-5) ,12) ) +(((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose((X+transpose(X,12) ) ,7) ) ) ) +transpose(((step(step(X,12) ,12) +transpose(shuffle(shuffle(transpose(X,-7) ) ) ,7) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) ,12) ) +echo((transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,-7) ,4) |step(echo(transpose(X,-7) ,4,6) ,12) ) ,4,6) ) ) ,-7) ,12) ) ) ,-5) +transpose((((((transpose((shuffle((step(X,12) |X) ) +transpose(shuffle(transpose(X,-5) ) ,12) ) ,-7) |(shuffle(X) +transpose(transpose(transpose((X+transpose(X,7) ) ,-5) ,-7) ,7) ) ) +transpose((shuffle(shuffle(transpose(transpose(transpose(X,-7) ,-5) ,-5) ) ) |echo((((transpose(arpeggio((X+transpose(X,4) ) ) ,-7) +transpose(echo(((transpose(X,4) |(echo(X,4,6) +transpose(transpose(X,-5) ,7) ) ) |transpose(transpose(step(X,12) ,4) ,-5) ) ,4,6) ,4) ) +transpose(transpose(arpeggio((X+transpose(transpose(transpose(X,-5) ,4) ,12) ) ) ,-5) ,7) ) |(transpose(transpose((X|X) ,-7) ,4) |(((X|arpeggio(X) ) +transpose((X+X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ) ,4,6) ) ,12) ) |((((step(step(step(transpose((echo(X,4,6) +transpose((X+transpose(X,7) ) ,7) ) ,-5) ,12) ,12) ,12) +transpose(((transpose(arpeggio((X|X) ) ,-5) +(((arpeggio(transpose((X+transpose(X,12) ) ,4) ) |(X+transpose(X,12) ) ) +transpose(step(X,12) ,4) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ,7) ) ) +transpose(echo((transpose(X,4) +transpose(arpeggio(X) ,7) ) ,4,6) ,7) ) ,4) ) +transpose(transpose(((arpeggio(transpose(X,-7) ) +transpose(transpose(shuffle(((((echo((X+transpose(X,7) ) ,4,6) +transpose(X,4) ) +transpose((X+transpose(arpeggio(X) ,7) ) ,7) ) +transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose((transpose(X,4) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,12) ) ,7) ) ) ,-7) ,4) ) +transpose(shuffle((X+transpose(arpeggio(transpose(X,4) ) ,12) ) ) ,7) ) ,4) ,4) ) +transpose(transpose((shuffle(transpose((X+transpose(X,12) ) ,-5) ) |transpose(shuffle(shuffle((X+(X|(X+transpose(X,12) ) ) ) ) ) ,-5) ) ,4) ,7) ) +shuffle(((((((X|X) +transpose(arpeggio(X) ,7) ) +transpose(echo(((X+transpose(transpose(X,-5) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4,6) ,4) ) +transpose((transpose(X,-5) |transpose(X,-7) ) ,7) ) +transpose(echo((((transpose(X,4) +transpose(step(X,12) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose((X|X) ,7) ) ,4,6) ,7) ) +transpose(arpeggio((((X+transpose(X,12) ) |(X|X) ) +X) ) ,7) ) ) ) ) |(((transpose((arpeggio(transpose(X,-5) ) +transpose((transpose((X+X) ,-5) +transpose(transpose(transpose(X,4) ,4) ,12) ) ,7) ) ,-7) +transpose(transpose(transpose(X,4) ,-7) ,7) ) +transpose((arpeggio(transpose(step(transpose(transpose(arpeggio(transpose(X,4) ) ,-7) ,4) ,12) ,-5) ) +shuffle(transpose(arpeggio(transpose(transpose(shuffle(X) ,-7) ,-7) ) ,-5) ) ) ,4) ) +transpose(((arpeggio(transpose((transpose(transpose(arpeggio(transpose((X+transpose(X,12) ) ,-5) ) ,-5) ,-7) |transpose((transpose(transpose(X,-5) ,-5) +transpose(echo((shuffle(X) +transpose((X|X) ,12) ) ,4,6) ,7) ) ,-7) ) ,-5) ) +transpose(transpose((((((transpose(X,-7) +transpose(X,12) ) +transpose(X,7) ) +transpose((step(arpeggio(X) ,12) |echo(((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,4,6) ) ,12) ) |(arpeggio((transpose(((X+transpose(X,12) ) +transpose(transpose(X,-7) ,12) ) ,-7) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose((transpose(X,-7) +transpose(X,12) ) ,7) ) ) ) +transpose(transpose(((transpose(X,-5) +transpose(X,7) ) |(X|X) ) ,-5) ,4) ) ) |transpose(X,-7) ) ,4) ,4) ) +transpose((echo(transpose(((transpose(X,-5) |transpose(X,-5) ) +transpose(arpeggio(arpeggio(transpose(X,-5) ) ) ,12) ) ,4) ,4,6) +transpose((shuffle(transpose((transpose(X,4) |transpose(X,4) ) ,4) ) |step((arpeggio(X) |transpose(transpose(X,4) ,-5) ) ,12) ) ,-5) ) ,7) ) ,7) ) ) +transpose((transpose(step(transpose(transpose((transpose(echo(X,4,6) ,-7) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ,4) ,-7) ,12) ,4) +transpose(((transpose(arpeggio(transpose(shuffle(X) ,-5) ) ,-5) |(transpose(transpose(arpeggio(shuffle(transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ) ) ,4) ,4) |arpeggio((((((((transpose((X+transpose(X,12) ) ,-5) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(((((X+transpose(X,12) ) +transpose(transpose(X,-5) ,4) ) +transpose((echo(X,4,6) +transpose(X,7) ) ,7) ) +transpose((transpose(X,-7) |echo(X,4,6) ) ,7) ) ,7) ) |transpose(arpeggio(((X|X) |X) ) ,-5) ) +transpose(transpose(transpose(((X+transpose(echo(X,4,6) ,7) ) +transpose(X,-5) ) ,4) ,-5) ,4) ) +transpose(shuffle(transpose(transpose(X,-7) ,4) ) ,7) ) +transpose((transpose(X,4) +((X+transpose(X,12) ) +transpose(echo(((X+transpose(X,7) ) |X) ,4,6) ,12) ) ) ,12) ) ) ) ) +transpose((transpose(transpose((((X|X) +transpose((step((step(step(X,12) ,12) +transpose(transpose(X,-5) ,12) ) ,12) +transpose(transpose((X+transpose(X,12) ) ,4) ,7) ) ,4) ) +transpose(((X|X) +echo(transpose(X,-7) ,4,6) ) ,7) ) ,4) ,-7) +transpose(shuffle((shuffle((((X|X) +transpose(shuffle(X) ,4) ) +transpose(shuffle(X) ,7) ) ) +transpose(transpose((transpose(X,-7) +transpose(echo(X,4,6) ,12) ) ,4) ,7) ) ) ,12) ) ,-5) ) ,7) ) ,7) ) ,7) )
random seed used was 0 EXPR = (((shuffle((echo((step((step(echo(transpose(transpose(transpose((X|X) ,-5) ,-7) ,4) ,4,6) ,12) +transpose((((arpeggio(X) +transpose(transpose(X,4) ,12) ) |((transpose(X,4) +transpose(shuffle(transpose(X,4) ) ,4) ) +transpose(shuffle(X) ,7) ) ) +transpose(echo(transpose(transpose(X,-5) ,-7) ,4,6) ,7) ) ,12) ) ,12) +step((transpose(shuffle(transpose((((X+transpose(X,12) ) +transpose(echo(X,4,6) ,7) ) +transpose(shuffle(X) ,7) ) ,4) ) ,-7) +transpose(transpose(transpose(echo(((X+transpose(transpose(X,-5) ,12) ) +transpose(transpose(step(X,12) ,4) ,7) ) ,4,6) ,-5) ,4) ,7) ) ,12) ) ,4,6) +transpose(shuffle((transpose(step(echo(X,4,6) ,12) ,-5) +(((arpeggio((X|X) ) +transpose(((transpose(X,-7) +(X|X) ) +transpose(transpose((X|X) ,-7) ,12) ) ,7) ) +transpose((((X+transpose(((X|transpose(X,4) ) |transpose(X,4) ) ,4) ) +transpose(transpose(((step(X,12) +transpose(transpose(X,-7) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) ,7) ) |transpose(((X+transpose((X+X) ,4) ) +transpose(((X+transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,-5) ) ,4) ) +transpose(transpose(((X+X) +X) ,-5) ,7) ) ) ) ,12) ) ) +((step(transpose(((((transpose(transpose(transpose(arpeggio(((X+X) +transpose(X,12) ) ) ,-7) ,4) ,4) +transpose((((transpose((X|(transpose(X,4) +transpose(X,12) ) ) ,-5) |arpeggio((X+transpose(X,7) ) ) ) +transpose(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ,4) ) +transpose(transpose((((step(X,12) +transpose(((X|step(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) +transpose(transpose(shuffle((X+transpose(X,12) ) ) ,-5) ,12) ) ,-5) ,7) ) ,4) ) +transpose((step(transpose(arpeggio(transpose(X,-7) ) ,4) ,12) +transpose((transpose((transpose(X,-7) |X) ,-5) +transpose(transpose((X|X) ,-5) ,12) ) ,12) ) ,7) ) +transpose(((((echo(X,4,6) +echo(X,4,6) ) +transpose((transpose((X|X) ,-7) +transpose(transpose((((X|X) +transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) ,4) ) +transpose((step((shuffle(X) +transpose(echo(X,4,6) ,7) ) ,12) |(X|X) ) ,7) ) |transpose(arpeggio((X+X) ) ,4) ) ,7) ) |(transpose(transpose(transpose(step(echo(transpose(shuffle(X) ,-7) ,4,6) ,12) ,-5) ,4) ,-7) +transpose(transpose((transpose(X,4) +transpose((transpose(transpose(echo(X,4,6) ,4) ,-5) +transpose(arpeggio(step(X,12) ) ,12) ) ,12) ) ,4) ,7) ) ) ,4) ,12) +transpose(step(transpose(echo(((((transpose(transpose(echo(X,4,6) ,-7) ,4) +transpose(arpeggio((X|transpose(X,4) ) ) ,4) ) +transpose(((X|X) +step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) |((X+transpose(X,7) ) +((X+transpose(shuffle(X) ,4) ) +transpose(shuffle(X) ,7) ) ) ) +((transpose((X|X) ,4) +transpose(transpose(transpose(arpeggio(X) ,-7) ,-5) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,4,6) ,-5) ,12) ,4) ) +transpose(step((arpeggio(echo((transpose(step((transpose(X,4) +transpose((X|X) ,12) ) ,12) ,-7) |((transpose(transpose(X,-5) ,4) +transpose(shuffle((X+transpose(echo(echo(X,4,6) ,4,6) ,12) ) ) ,4) ) +transpose(((((((X+transpose(step(X,12) ,4) ) +transpose(shuffle(X) ,7) ) |transpose(arpeggio(X) ,4) ) +transpose(shuffle((X+X) ) ,4) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) +((shuffle(transpose(X,-5) ) +transpose(step(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,4) ) +transpose((X|X) ,7) ) ,-5) ,12) ,4) ) +transpose(echo(transpose((X+transpose(X,7) ) ,-7) ,4,6) ,7) ) ) ,7) ) ) ,4,6) ) +transpose(transpose((((shuffle(transpose(transpose(X,4) ,4) ) |((X+transpose(X,12) ) |transpose(X,-7) ) ) +transpose((((transpose(X,-7) +transpose(transpose(transpose(X,-5) ,-7) ,12) ) +transpose(transpose(X,-7) ,7) ) +transpose(transpose(transpose(transpose(X,-7) ,4) ,-7) ,7) ) ,4) ) +transpose(shuffle(((transpose(transpose(X,4) ,-7) +transpose(transpose(transpose(transpose((X|X) ,4) ,-7) ,4) ,4) ) +transpose(arpeggio(transpose(step((X|X) ,12) ,4) ) ,7) ) ) ,7) ) ,4) ,12) ) ,12) ,7) ) ) +transpose((transpose(transpose((((echo((transpose(X,4) |(((X+transpose(X,4) ) +transpose(X,7) ) |X) ) ,4,6) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,-7) ) +echo(((echo(X,4,6) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,4,6) ) ) |(((transpose((transpose(X,-5) +transpose(X,7) ) ,-7) +transpose((((transpose(transpose(X,4) ,-5) +transpose((step(X,12) +transpose(X,12) ) ,4) ) +transpose(((X+transpose(transpose(X,4) ,4) ) +transpose((X|X) ,7) ) ,7) ) +transpose(transpose(X,-7) ,12) ) ,12) ) +transpose(((arpeggio(X) +arpeggio((X+transpose(echo(X,4,6) ,7) ) ) ) +transpose((transpose((X+transpose(X,12) ) ,4) +transpose(transpose((X+transpose(arpeggio(X) ,7) ) ,-7) ,12) ) ,7) ) ,4) ) +transpose(transpose(echo((transpose(X,4) |echo(X,4,6) ) ,4,6) ,-5) ,7) ) ) +transpose(((echo(((arpeggio(X) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4,6) +transpose(((step(step(shuffle(transpose(X,4) ) ,12) ,12) +transpose(((((echo(X,4,6) +transpose(transpose(X,4) ,12) ) +transpose(echo(transpose(X,-5) ,4,6) ,12) ) |arpeggio(arpeggio(X) ) ) +transpose(((transpose(transpose((X+transpose(X,7) ) ,-5) ,4) +transpose(transpose(X,-5) ,4) ) +transpose(((X+transpose(X,4) ) +transpose((transpose(X,-7) +transpose(X,7) ) ,7) ) ,7) ) ,7) ) ,12) ) +transpose(transpose((((X|X) |transpose(X,4) ) |((transpose(X,4) +transpose((X|X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,-7) ,12) ) ,7) ) +transpose(transpose(transpose(echo(echo(X,4,6) ,4,6) ,4) ,4) ,12) ) ,12) ) ,4) ,4) +transpose((transpose(transpose(step(transpose(transpose(((transpose(transpose(X,-7) ,4) +transpose((X|transpose(X,4) ) ,7) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,12) ) +transpose(((X|X) |transpose(X,-7) ) ,7) ) ,-5) ) ,4) ,4) ,12) ,-5) ,4) +transpose(echo(transpose((transpose((((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) |X) ,4) |((echo(step(((X|X) +transpose(transpose(X,4) ,12) ) ,12) ,4,6) +transpose(echo((transpose(transpose(X,-5) ,-7) +shuffle(transpose(X,-5) ) ) ,4,6) ,4) ) +transpose(transpose(transpose(arpeggio((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4) ,4) ,7) ) ) ,-7) ,4,6) ,7) ) ,7) ) ,4) ) +transpose(arpeggio((transpose(arpeggio(transpose((((echo(echo((echo(X,4,6) |(X+transpose(X,12) ) ) ,4,6) ,4,6) +transpose((((arpeggio((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +transpose(echo(echo(X,4,6) ,4,6) ,4) ) +transpose((transpose(X,-7) |shuffle(X) ) ,7) ) +transpose(transpose((((X+transpose(X,12) ) |(X+transpose(X,7) ) ) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,12) ) ) ,4) ,7) ) ,7) ) +((transpose(echo((X|X) ,4,6) ,4) +transpose(transpose(step(X,12) ,4) ,4) ) +transpose(((step(X,12) +transpose(X,7) ) |transpose(transpose(X,4) ,4) ) ,7) ) ) |arpeggio(((echo(X,4,6) +transpose(((X+transpose(transpose(X,-5) ,7) ) +transpose(X,7) ) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ) ) ,-7) ) ,4) |transpose(transpose(((arpeggio(((echo(X,4,6) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) +transpose((transpose(transpose(X,4) ,-5) +transpose(step(X,12) ,12) ) ,12) ) ) +transpose(transpose(transpose(step((X|X) ,12) ,-7) ,-7) ,4) ) +transpose(((shuffle(transpose(X,-7) ) +transpose(((X|X) |step(step(X,12) ,12) ) ,4) ) +transpose(transpose(((X|X) +transpose(X,12) ) ,4) ,7) ) ,7) ) ,-7) ,4) ) ) ,7) )
random seed used was 0

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