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 15 generations the expression "X" became this:
((((transpose((((((X+transpose(X,7) ) |(X+X) ) +transpose(echo(step(((step(X,12) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ,4,6) ,7) ) +transpose(shuffle(echo((transpose((X+X) ,-7) |arpeggio(X) ) ,4,6) ) ,4) ) +transpose(step(shuffle((shuffle(((X+transpose(X,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) |(shuffle(X) +X) ) ) ,12) ,7) ) ,-5) +transpose(((transpose(((step(transpose(echo(step(X,12) ,4,6) ,-5) ,12) +transpose(arpeggio(arpeggio(transpose(transpose((X+X) ,4) ,4) ) ) ,4) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) ,4) +transpose(transpose(echo((((echo(transpose(X,4) ,4,6) +transpose(arpeggio((X+transpose(X,12) ) ) ,4) ) +transpose(echo(transpose(shuffle(X) ,4) ,4,6) ,7) ) +(shuffle(transpose(X,-5) ) |echo((step(X,12) +X) ,4,6) ) ) ,4,6) ,4) ,4) ) +transpose((shuffle(echo(echo(arpeggio((X+X) ) ,4,6) ,4,6) ) +shuffle((shuffle(X) +transpose(((transpose(transpose(step(X,12) ,-5) ,4) |((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ) +transpose(transpose(((arpeggio(X) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose((step(X,12) +X) ,7) ) ,-7) ,12) ) ,7) ) ) ) ,7) ) ,4) ) +transpose((((transpose(((((echo(X,4,6) |(echo(X,4,6) |X) ) +transpose(echo(transpose(X,4) ,4,6) ,4) ) +transpose((X+X) ,7) ) +transpose(shuffle(X) ,7) ) ,-7) +transpose(((echo((arpeggio(transpose(((((echo(arpeggio(X) ,4,6) +transpose((X+transpose(X,-5) ) ,4) ) +transpose(((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) +transpose(transpose(transpose(X,-5) ,-7) ,4) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,4) ) |echo(transpose(echo((X+transpose(X,7) ) ,4,6) ,-7) ,4,6) ) ,4,6) +transpose((echo(((X+transpose((X+transpose(X,7) ) ,12) ) +transpose(X,12) ) ,4,6) +transpose(transpose(X,-7) ,12) ) ,4) ) +transpose(arpeggio(step(transpose((arpeggio(echo((X+X) ,4,6) ) |transpose(((shuffle(X) +X) +transpose((X|X) ,12) ) ,-7) ) ,-5) ,12) ) ,7) ) ,4) ) +transpose(((arpeggio(shuffle(transpose(step(((echo((X|X) ,4,6) +transpose(echo(X,4,6) ,4) ) +transpose((echo(X,4,6) +X) ,7) ) ,12) ,-5) ) ) +transpose(step(echo(((arpeggio(echo((X+X) ,4,6) ) +transpose(arpeggio(((echo(X,4,6) +((X+transpose(X,4) ) +transpose(X,7) ) ) +arpeggio(X) ) ) ,4) ) +transpose(echo(transpose(shuffle(X) ,-7) ,4,6) ,7) ) ,4,6) ,12) ,4) ) +transpose(step((transpose((echo(X,4,6) +transpose(arpeggio(X) ,12) ) ,4) |arpeggio(((step(X,12) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ) ) ,12) ,7) ) ,7) ) +(arpeggio((transpose(arpeggio(echo(step(X,12) ,4,6) ) ,-7) +transpose((((transpose(arpeggio(X) ,4) +transpose((transpose(arpeggio(X) ,4) |(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,4) ) +transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(((X|X) +transpose((X|X) ,12) ) ) ,4) ) +transpose(step(arpeggio((X|X) ) ,12) ,7) ) ,7) ) |shuffle(X) ) ,7) ) ) +transpose(step(shuffle(((shuffle(((((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(transpose(arpeggio(X) ,-7) ,4) ) +transpose(arpeggio(step(step(X,12) ,12) ) ,7) ) ) +transpose((transpose(((X+X) |echo(X,4,6) ) ,4) +transpose(shuffle(transpose(X,4) ) ,7) ) ,12) ) +transpose((((arpeggio(step(X,12) ) +transpose(X,7) ) +transpose(shuffle(shuffle((X+X) ) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,12) ) ) ,12) ,7) ) ) ,7) ) +transpose(transpose(((transpose(arpeggio((shuffle(shuffle(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ) +(((((X+X) |(X+transpose(X,12) ) ) +transpose(transpose(X,4) ,12) ) +transpose((((transpose(shuffle(X) ,-7) +transpose(transpose(transpose(X,-7) ,-5) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +((((X+transpose(X,4) ) +transpose(X,7) ) +shuffle(X) ) +X) ) ,4) ) +transpose(transpose((transpose(shuffle(X) ,-7) |arpeggio(echo(X,4,6) ) ) ,-5) ,7) ) ) ) ,-7) +transpose(transpose(shuffle(transpose(transpose((X|echo(X,4,6) ) ,4) ,-7) ) ,-5) ,4) ) +transpose(transpose((((transpose((X+transpose(X,12) ) ,4) +step(step(arpeggio(X) ,12) ,12) ) +transpose(transpose(transpose(arpeggio((X+transpose(X,12) ) ) ,-7) ,-5) ,4) ) +transpose(((arpeggio(((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ) +transpose(echo(arpeggio(X) ,4,6) ,4) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ,7) ) ,4) ,7) ) ,-5) ,7) ) +transpose((((transpose(echo(((transpose(((X|transpose(X,-7) ) +(transpose(transpose(X,4) ,-7) +transpose((X|step(X,12) ) ,7) ) ) ,4) +transpose(step(shuffle((transpose(shuffle(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,-7) +transpose(((shuffle((step(X,12) +X) ) +transpose(transpose(transpose(X,-5) ,-7) ,4) ) +transpose((shuffle(X) +transpose(X,12) ) ,7) ) ,12) ) ) ,12) ,4) ) +transpose(transpose(shuffle(transpose(transpose(transpose(X,-5) ,-7) ,-5) ) ,-5) ,7) ) ,4,6) ,-5) +(((echo(echo(arpeggio(arpeggio(shuffle(step(arpeggio(X) ,12) ) ) ) ,4,6) ,4,6) +transpose(transpose(shuffle(step(((echo((X+transpose(X,12) ) ,4,6) +transpose(((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(X,7) ) ,12) ) ,-5) ,4) ) +transpose(((transpose((shuffle((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-5) ) ) +echo(transpose(X,-5) ,4,6) ) ,-5) +transpose((shuffle(transpose(((X+transpose(X,12) ) |echo((X+transpose(X,12) ) ,4,6) ) ,-5) ) |transpose(step((X|X) ,12) ,4) ) ,4) ) +transpose(((transpose(transpose(X,-5) ,-5) |shuffle(arpeggio(transpose(X,4) ) ) ) +transpose(X,-7) ) ,7) ) ,7) ) +((transpose((shuffle(shuffle(X) ) |((step(transpose(X,-5) ,12) +transpose(echo(X,4,6) ,4) ) +transpose((X+X) ,7) ) ) ,4) +transpose(arpeggio(transpose(X,4) ) ,4) ) +transpose(transpose((((((arpeggio(X) +transpose(transpose(X,-5) ,7) ) +transpose((X+transpose(shuffle(X) ,7) ) ,7) ) |echo(((transpose((X|X) ,-7) +transpose(((X+X) |(X+X) ) ,4) ) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) ,4,6) ) +transpose(step(arpeggio(step(transpose(X,4) ,12) ) ,12) ,4) ) +transpose(shuffle(shuffle(transpose(X,-7) ) ) ,7) ) ,-7) ,7) ) ) ) +transpose((echo(transpose(step(step(step(echo(X,4,6) ,12) ,12) ,12) ,-5) ,4,6) +step(transpose(transpose(((((arpeggio(arpeggio(arpeggio((X+X) ) ) ) +echo(((arpeggio(X) +transpose(echo(X,4,6) ,4) ) +transpose(((X+transpose(X,12) ) |transpose(X,-5) ) ,7) ) ,4,6) ) |transpose(echo((X+(X+X) ) ,4,6) ,-7) ) +transpose((((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(transpose(transpose(transpose(arpeggio(X) ,4) ,4) ,-7) ,7) ) ,4) ) +transpose(shuffle(((((echo(shuffle(shuffle(X) ) ,4,6) +transpose((step(X,12) |transpose((X|X) ,4) ) ,4) ) +transpose(step(X,12) ,7) ) +transpose(shuffle(transpose(echo(arpeggio(X) ,4,6) ,-7) ) ,4) ) +transpose(shuffle((X+transpose(echo((X+transpose(X,12) ) ,4,6) ,12) ) ) ,7) ) ) ,7) ) ,-7) ,-7) ,12) ) ,4) ) +transpose(shuffle((arpeggio(arpeggio((echo((X+transpose(X,7) ) ,4,6) +transpose(step(step(transpose((X+transpose(X,12) ) ,4) ,12) ,12) ,12) ) ) ) +((transpose((((transpose(X,4) +transpose(echo(X,4,6) ,12) ) +transpose(arpeggio(shuffle(transpose(step(X,12) ,-7) ) ) ,4) ) +transpose(shuffle((X+transpose(X,4) ) ) ,7) ) ,-5) +transpose(((step(shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,12) +transpose(transpose(transpose(step(((shuffle(X) +transpose(arpeggio(X) ,4) ) +transpose(arpeggio(X) ,7) ) ,12) ,-5) ,-5) ,4) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,4) ) +transpose(transpose((echo(X,4,6) +((X+transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,4) ,7) ) ) ) ,7) ) ,7) )
random seed used was 10 EXPR = ((transpose(((((shuffle(shuffle((((arpeggio(shuffle(X) ) |step((((X+transpose(X,4) ) +transpose(X,7) ) |((transpose(X,-7) +transpose(shuffle((X|X) ) ,4) ) +transpose(shuffle(X) ,7) ) ) ,12) ) +transpose(((transpose(echo(transpose(arpeggio(X) ,4) ,4,6) ,-5) +transpose((echo((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4,6) +transpose((arpeggio((((X+X) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ) +transpose(X,-7) ) ,12) ) ,4) ) +transpose(echo(step(((X|X) +X) ,12) ,4,6) ,7) ) ,4) ) +transpose(transpose(transpose(echo(transpose(X,-7) ,4,6) ,-7) ,-7) ,7) ) ) ) +transpose(((transpose(X,-5) +transpose(arpeggio(echo(transpose(step(X,12) ,4) ,4,6) ) ,12) ) |((transpose(echo(transpose(shuffle((transpose(X,-5) +transpose(X,7) ) ) ,4) ,4,6) ,-7) +transpose(((transpose(X,-7) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,7) ) |arpeggio(X) ) ,4) ) +transpose(transpose(echo(shuffle(X) ,4,6) ,4) ,7) ) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) ) ,4) ) +transpose(step((shuffle(echo(transpose(X,-7) ,4,6) ) +echo((X+transpose(shuffle(X) ,12) ) ,4,6) ) ,12) ,7) ) +transpose(echo(arpeggio(transpose(echo(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ,4,6) ,4) ) ,4,6) ,12) ) +transpose(((((transpose(((((echo(step(X,12) ,4,6) +transpose(transpose((X|X) ,4) ,4) ) +transpose(X,7) ) +(step(X,12) +step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) +transpose(shuffle((arpeggio(X) |step(X,12) ) ) ,12) ) ,-7) +transpose(step(((shuffle(step(transpose(X,4) ,12) ) +transpose((echo(X,4,6) +transpose(transpose(transpose(X,-7) ,-5) ,12) ) ,4) ) +transpose(shuffle(X) ,7) ) ,12) ,7) ) +transpose(step(arpeggio(echo(transpose(echo(X,4,6) ,-5) ,4,6) ) ,12) ,-5) ) +transpose(step((arpeggio((arpeggio(arpeggio((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) +echo(shuffle(transpose(X,4) ) ,4,6) ) ) |transpose(((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-7) +transpose(echo(step(step(X,12) ,12) ,4,6) ,4) ) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,4) ) ,12) ,4) ) +transpose(shuffle(echo(transpose(step((echo(X,4,6) +transpose(X,7) ) ,12) ,-5) ,4,6) ) ,7) ) ,7) ) ,4) +transpose(arpeggio((transpose(step(shuffle(shuffle(echo(shuffle((((echo(X,4,6) |transpose(X,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ) ,4,6) ) ) ,12) ,-5) |transpose(shuffle(shuffle(shuffle(echo((((((transpose(X,4) +transpose(X,-5) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(shuffle(transpose((X|X) ,4) ) ,4) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) ,4,6) ) ) ) ,4) ) ) ,4) ) +transpose(transpose(shuffle(((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) ,4) +transpose(arpeggio((arpeggio(X) +transpose(transpose(shuffle((shuffle(X) |echo(X,4,6) ) ) ,-5) ,7) ) ) ,4) ) +transpose(transpose((arpeggio(X) |transpose(X,-5) ) ,4) ,7) ) ) ,4) ,7) )
random seed used was 0 EXPR = (transpose(((echo((shuffle((transpose((X|arpeggio(X) ) ,-5) |step((shuffle(echo(X,4,6) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) ) ,12) ) ) |echo(arpeggio((X+step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,4,6) ) ,4,6) +transpose(((step(((transpose(X,4) +transpose((((X+X) +transpose((X|transpose(X,-5) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) |shuffle(transpose((X+transpose((X|X) ,12) ) ,-7) ) ) ,12) +transpose(((shuffle(transpose(shuffle(step(X,12) ) ,4) ) +transpose(step((arpeggio(X) +transpose((X|X) ,12) ) ,12) ,7) ) +transpose(echo(echo(X,4,6) ,4,6) ,12) ) ,4) ) +transpose((((transpose(shuffle(echo(X,4,6) ) ,4) +transpose(echo(transpose(step((X+transpose(transpose(X,4) ,7) ) ,12) ,4) ,4,6) ,7) ) +transpose(transpose(echo((X+transpose(arpeggio(X) ,7) ) ,4,6) ,-7) ,4) ) +transpose((step(shuffle(X) ,12) |transpose(step(transpose(X,-5) ,12) ,-7) ) ,7) ) ,7) ) ,4) ) +transpose((((transpose(X,-5) |(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-5) +transpose(echo(shuffle((X+X) ) ,4,6) ,12) ) ) +transpose(transpose(transpose(transpose(echo(transpose((X+transpose(X,7) ) ,-7) ,4,6) ,4) ,4) ,-5) ,4) ) +transpose((echo(echo(((((step(X,12) +transpose((X|X) ,4) ) +transpose(X,7) ) |X) +transpose(arpeggio(transpose(X,4) ) ,7) ) ,4,6) ,4,6) +transpose(echo(((step(echo((X+transpose(X,7) ) ,4,6) ,12) +step(shuffle(X) ,12) ) +transpose(transpose((X+step(X,12) ) ,4) ,7) ) ,4,6) ,7) ) ,7) ) ,7) ) ,-7) +transpose((((step(shuffle(transpose(shuffle((transpose(X,-5) +transpose((X+X) ,7) ) ) ,-5) ) ,12) |echo(((((((shuffle(echo(step((X+transpose(X,7) ) ,12) ,4,6) ) +transpose((echo(arpeggio(X) ,4,6) +transpose(shuffle(arpeggio(shuffle(X) ) ) ,12) ) ,12) ) +transpose(transpose(transpose(step(step(echo(X,4,6) ,12) ,12) ,4) ,4) ,12) ) +transpose((arpeggio((transpose(arpeggio(X) ,-7) +transpose(echo(X,4,6) ,7) ) ) +transpose(transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,-7) ,-5) ) ,7) ) +((shuffle(((X+X) +transpose(X,12) ) ) +transpose((transpose(transpose(step(echo((X+X) ,4,6) ,12) ,-5) ,-7) |step((echo(X,4,6) |(X+X) ) ,12) ) ,4) ) +transpose((((step(arpeggio(arpeggio(step(X,12) ) ) ,12) +transpose(transpose((((transpose(X,-7) +(X|X) ) +transpose(((transpose(X,-5) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,4) ) +transpose(shuffle(transpose(X,4) ) ,7) ) ,-5) ,4) ) +transpose(step((((step(X,12) +transpose(((X+X) |transpose(X,-7) ) ,12) ) +transpose(echo(step(X,12) ,4,6) ,4) ) +transpose(step((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,7) ) ,12) ,7) ) |shuffle(transpose(((X+X) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) ) ,7) ) ) +transpose(arpeggio(transpose(shuffle(arpeggio(X) ) ,-7) ) ,4) ) +transpose((step(echo(arpeggio(((transpose(X,4) +echo(X,4,6) ) |arpeggio(step(step(X,12) ,12) ) ) ) ,4,6) ,12) +arpeggio((step(shuffle(transpose(echo(X,4,6) ,4) ) ,12) +transpose(((X+transpose(X,12) ) |X) ,12) ) ) ) ,7) ) ,4,6) ) +transpose(((arpeggio((transpose((echo(transpose(X,-5) ,4,6) +transpose((transpose(X,-5) +shuffle(X) ) ,7) ) ,-7) +transpose((echo(X,4,6) +((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ) ,12) ) ) +transpose(arpeggio((arpeggio(transpose(((arpeggio(step(((X+transpose((X|X) ,4) ) +transpose(X,7) ) ,12) ) +transpose(step(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((step(X,12) +transpose((X+X) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(transpose(arpeggio(X) ,-7) ,7) ) ,4) ,12) ,4) ) +transpose(echo((((shuffle(X) +transpose((X+X) ,4) ) +transpose((X|X) ,7) ) +echo(echo(X,4,6) ,4,6) ) ,4,6) ,7) ) ,-5) ) |(transpose(shuffle(transpose(shuffle(X) ,-5) ) ,4) +((((X+transpose(X,7) ) +transpose(shuffle(transpose(X,4) ) ,12) ) +transpose(arpeggio(arpeggio(shuffle(X) ) ) ,4) ) +transpose(arpeggio(arpeggio(X) ) ,7) ) ) ) ) ,4) ) +transpose(echo(step((shuffle(transpose((step((X+transpose(step(X,12) ,12) ) ,12) +transpose((((echo((X|X) ,4,6) +echo(transpose(X,-5) ,4,6) ) +transpose(((echo(X,4,6) +transpose(echo(X,4,6) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose((X|(X|(X|X) ) ) ,7) ) ,7) ) ,-5) ) |echo(arpeggio(X) ,4,6) ) ,12) ,4,6) ,7) ) ,4) ) +transpose(transpose(shuffle(((echo(echo(transpose(X,-7) ,4,6) ,4,6) +transpose(arpeggio(echo(((((echo(X,4,6) +X) +transpose(shuffle(X) ,7) ) +transpose((step(transpose(X,4) ,12) +(arpeggio(X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,4,6) ) ,7) ) |(echo(arpeggio(transpose(X,-7) ) ,4,6) |((((((((step(X,12) +transpose(shuffle(X) ,4) ) +transpose((((X+X) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,7) ) +transpose(((X+transpose(X,7) ) |transpose(X,4) ) ,4) ) +transpose(((echo(transpose(X,4) ,4,6) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4) ) +transpose((arpeggio(X) +(shuffle(X) +transpose(shuffle(X) ,7) ) ) ,7) ) ,7) ) +transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +((echo(X,4,6) +transpose(X,4) ) +transpose((X|X) ,7) ) ) ) ,12) ) |echo((((((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +arpeggio(X) ) +transpose(((arpeggio(X) +transpose(shuffle(X) ,4) ) +transpose((X+X) ,7) ) ,4) ) +transpose(X,7) ) +transpose(echo(((shuffle(X) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,4) ,7) ) ,4,6) ,4) ) +transpose(transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,-7) ,-5) ,7) ) ,4,6) ) +transpose(((arpeggio(echo(X,4,6) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) +((step(X,12) +transpose(step((arpeggio(X) +X) ,12) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,4) ) +transpose((transpose(transpose(X,4) ,-5) +transpose(echo(((X+X) |((X+transpose((X|X) ,4) ) +transpose(step(X,12) ,7) ) ) ,4,6) ,7) ) ,7) ) ) ) ) ,-5) ,7) ) ,12) )
random seed used was 0 EXPR = transpose(arpeggio(step(step(shuffle(((step(step(transpose(X,-7) ,12) ,12) +transpose(echo((X|((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) ) ,4,6) ,4) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) ) ,12) ,12) ) ,-5)
random seed used was 0

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