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:
(arpeggio((((echo(((transpose(shuffle(transpose(X,-5) ) ,-5) +transpose(transpose(((transpose(((arpeggio(X) +transpose(transpose(X,-7) ,12) ) +transpose(X,7) ) ,4) +transpose((shuffle(X) +transpose((((X+X) +transpose((X+X) ,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose((shuffle(X) +transpose(echo((X+transpose(X,12) ) ,4,6) ,12) ) ,7) ) ,-5) ,4) ) +transpose(echo(shuffle(((transpose(transpose(X,4) ,-5) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ) |transpose(transpose(X,-5) ,-5) ) ) ,4,6) ,7) ) ,4,6) |((((shuffle((((((step(X,12) +X) +transpose(arpeggio(X) ,4) ) +transpose(shuffle(X) ,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(((transpose(X,-5) +X) +transpose((((shuffle(transpose(X,-7) ) +transpose((X+transpose(X,-5) ) ,4) ) +transpose(transpose(shuffle(X) ,4) ,7) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ,7) ) ) +transpose(step(shuffle((X+X) ) ,12) ,-7) ) +transpose(((((transpose(((X+X) +transpose(transpose(X,-5) ,7) ) ,4) +transpose(transpose(transpose(transpose(X,-7) ,-5) ,-5) ,4) ) +transpose(shuffle(echo(shuffle(transpose(X,-7) ) ,4,6) ) ,7) ) +transpose(echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4,6) ,7) ) +(echo((transpose(X,-7) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) +(((echo((X+X) ,4,6) |(echo(X,4,6) +transpose(X,7) ) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose((((X+(X|X) ) +transpose(arpeggio(X) ,7) ) |(transpose(X,-5) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,12) ) ) ,12) ) ) ) ,4) ) +transpose((((shuffle(transpose(step((X+transpose(X,7) ) ,12) ,4) ) +transpose(shuffle(transpose(transpose(((X+X) |transpose(X,-5) ) ,-5) ,4) ) ,4) ) +transpose(transpose(transpose(((X|echo(X,4,6) ) |transpose(X,-5) ) ,4) ,-7) ,7) ) +transpose(transpose(step((transpose(echo((X|shuffle(X) ) ,4,6) ,-7) +transpose(arpeggio(transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4) ) ,12) ) ,12) ,4) ,7) ) ,7) ) +transpose(transpose(transpose((transpose(transpose((((transpose(transpose(transpose(X,4) ,-5) ,-5) +((X+transpose(X,4) ) +transpose(transpose(X,-5) ,-7) ) ) +transpose((step(X,12) +transpose(transpose(shuffle((X+transpose(X,12) ) ) ,4) ,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,-7) ,4) +(((arpeggio(((transpose((X|(X+X) ) ,-5) |(transpose(X,-7) +transpose(step(echo(X,4,6) ,12) ,-5) ) ) |transpose(echo((X+X) ,4,6) ,-7) ) ) +transpose(arpeggio(transpose(shuffle(X) ,-5) ) ,4) ) +transpose(shuffle(transpose(echo(transpose((arpeggio(X) |transpose(X,4) ) ,4) ,4,6) ,4) ) ,7) ) |shuffle(step(step(echo(X,4,6) ,12) ,12) ) ) ) ,-5) ,-5) ,12) ) ) |shuffle(((shuffle((shuffle(arpeggio(shuffle((shuffle(echo(X,4,6) ) +transpose(shuffle((((shuffle(X) +transpose(transpose(X,4) ,12) ) +transpose((echo(X,4,6) +(X|X) ) ,4) ) +transpose((X|X) ,7) ) ) ,12) ) ) ) ) +transpose((transpose(transpose((transpose(X,-5) |(step(X,12) +transpose((((X|transpose(X,4) ) +transpose(arpeggio(arpeggio(X) ) ,4) ) +transpose((X|X) ,7) ) ,12) ) ) ,-5) ,4) |(transpose(transpose((X+transpose(X,7) ) ,-5) ,-5) +(transpose(transpose(X,-5) ,-7) +transpose(arpeggio(transpose(X,-7) ) ,7) ) ) ) ,12) ) ) +transpose(transpose(shuffle(transpose(transpose(arpeggio((((transpose(X,-5) |transpose(X,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) +transpose(((transpose(X,-7) +transpose(echo(transpose(shuffle(X) ,-7) ,4,6) ,12) ) +transpose((echo(X,4,6) +transpose(transpose(X,4) ,7) ) ,7) ) ,12) ) ) ,-7) ,4) ) ,-7) ,4) ) +transpose(transpose(shuffle((((((X+transpose(echo(X,4,6) ,7) ) +transpose(((X+X) |step((X+transpose(X,12) ) ,12) ) ,7) ) +shuffle((X|X) ) ) |shuffle((X+shuffle(transpose(X,-7) ) ) ) ) +transpose(transpose((shuffle(transpose(X,4) ) +(transpose((shuffle(X) |(X+transpose(X,7) ) ) ,-7) +transpose(X,7) ) ) ,-7) ,12) ) ) ,-7) ,7) ) ) ) +shuffle(shuffle(step((arpeggio(shuffle(((transpose(transpose((((transpose(X,4) +transpose(X,12) ) +transpose((X|X) ,4) ) +transpose(shuffle((X|X) ) ,7) ) ,-7) ,4) +transpose((arpeggio(((((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +step(X,12) ) |arpeggio(transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ) ) ) +arpeggio(((transpose(transpose(X,-5) ,4) |(((transpose(shuffle(X) ,-7) |transpose(transpose(X,-5) ,-5) ) +transpose((((transpose(X,-5) +transpose(step(X,12) ,12) ) +transpose(echo(X,4,6) ,4) ) +transpose(((shuffle(X) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(step((X+X) ,12) ,7) ) ) |transpose(transpose((shuffle(transpose(X,-5) ) +transpose(X,4) ) ,4) ,-7) ) ) ) ,7) ) |echo(arpeggio(((((transpose(echo(X,4,6) ,4) |shuffle(transpose(X,4) ) ) +shuffle((X+X) ) ) +transpose(((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) |echo((transpose((X+X) ,-7) |((transpose(X,4) +transpose((X+transpose(X,12) ) ,4) ) +transpose(arpeggio(X) ,7) ) ) ,4,6) ) ) ,4,6) ) ) ) +transpose(shuffle((step(echo((transpose(arpeggio((transpose(step(X,12) ,-7) |((X|X) |(X+transpose(X,7) ) ) ) ) ,4) |((transpose(transpose(X,-7) ,-5) +transpose(transpose((transpose(X,-5) +transpose(X,12) ) ,-5) ,12) ) +transpose(arpeggio(shuffle(step(echo(X,4,6) ,12) ) ) ,-7) ) ) ,4,6) ,12) +transpose(transpose((shuffle((arpeggio(transpose(X,-7) ) +step(step((transpose(X,-7) +transpose((transpose(X,-7) +(transpose(X,4) +transpose(shuffle(X) ,7) ) ) ,7) ) ,12) ,12) ) ) +(shuffle(((echo(X,4,6) +transpose(X,-5) ) +shuffle((X+transpose(X,7) ) ) ) ) +(((arpeggio(((transpose(X,-7) +transpose(X,12) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) ) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ) +transpose(shuffle(step(((X+transpose(step(X,12) ,4) ) +transpose(X,7) ) ,12) ) ,7) ) |transpose(((step(transpose(((X+X) +transpose(X,7) ) ,4) ,12) +(((X+transpose(X,7) ) |X) +transpose(X,7) ) ) +((shuffle(X) +X) +transpose(X,12) ) ) ,4) ) ) ) ,-7) ,12) ) ) ,7) ) ,12) ) ) ) ) +arpeggio(transpose((((shuffle((transpose(transpose(arpeggio(shuffle((echo((transpose(transpose(X,4) ,-7) |transpose((X+(X+transpose(X,12) ) ) ,4) ) ,4,6) |X) ) ) ,4) ,4) |(step(shuffle(transpose((((transpose(transpose((X|X) ,-5) ,4) +transpose(step(((arpeggio(X) +transpose(shuffle(X) ,4) ) +transpose((X+X) ,7) ) ,12) ,4) ) +transpose(echo((X+X) ,4,6) ,7) ) +((shuffle((X+X) ) +(shuffle(X) +echo(X,4,6) ) ) +transpose(transpose(X,-5) ,-7) ) ) ,4) ) ,12) +((transpose((transpose(shuffle(shuffle(transpose(X,-5) ) ) ,-5) +transpose(((transpose((X|X) ,4) +transpose(step(X,12) ,12) ) +X) ,12) ) ,-7) +transpose((transpose((transpose(transpose(echo(X,4,6) ,-5) ,-7) +transpose(((transpose(transpose(X,4) ,-5) +transpose((X|transpose(X,-7) ) ,7) ) +transpose(echo(((X+X) +transpose(X,7) ) ,4,6) ,7) ) ,7) ) ,-7) +transpose(arpeggio(transpose(transpose((X|(X|X) ) ,4) ,-5) ) ,7) ) ,4) ) +transpose(((((transpose(X,-5) |(shuffle((X+X) ) +transpose(X,-5) ) ) +transpose(transpose(transpose(transpose(transpose(transpose(X,4) ,-5) ,-5) ,-5) ,-7) ,7) ) +transpose(shuffle((X+transpose(X,12) ) ) ,4) ) +transpose(arpeggio((((transpose((X+X) ,4) +transpose(transpose(X,-5) ,-7) ) +transpose(step((((transpose((X+X) ,4) +transpose((X+(X+transpose(X,12) ) ) ,12) ) +transpose((X|X) ,4) ) +transpose(X,7) ) ,12) ,4) ) +transpose(shuffle((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,7) ) ) ,7) ) ,7) ) ) ) ) +transpose(((((((shuffle(echo((transpose(((shuffle(shuffle(X) ) +transpose((arpeggio(transpose(X,-5) ) +transpose(transpose(shuffle(X) ,-7) ,12) ) ,4) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,4) ,-5) ,7) ) ,4) |(shuffle(X) +transpose(transpose(transpose(X,-7) ,4) ,12) ) ) ,4,6) ) +transpose((shuffle((shuffle(((X|X) +X) ) +transpose(transpose(shuffle(X) ,-5) ,12) ) ) |(transpose(echo(transpose(X,-5) ,4,6) ,-5) |(((X+X) +shuffle(X) ) +((X+(X+transpose(X,7) ) ) |(transpose(transpose(X,-7) ,-5) +transpose(X,7) ) ) ) ) ) ,4) ) +transpose((transpose(arpeggio(((step(transpose(X,-5) ,12) +transpose(transpose(transpose((X|X) ,4) ,4) ,4) ) +transpose(((X+X) +X) ,7) ) ) ,-7) |transpose(shuffle((X+X) ) ,4) ) ,7) ) +transpose(shuffle((transpose((step(transpose(X,4) ,12) +transpose(transpose(X,-7) ,12) ) ,-5) |step(step(X,12) ,12) ) ) ,4) ) +transpose(step(transpose(transpose((X+X) ,4) ,-7) ,12) ,7) ) +transpose(transpose((step((((((X|transpose(step(X,12) ,-5) ) +transpose((transpose(transpose(X,-5) ,-7) +transpose((transpose(X,4) +(X|X) ) ,12) ) ,12) ) +transpose((((echo(X,4,6) +transpose(transpose(X,-5) ,4) ) +transpose(step(X,12) ,7) ) |((shuffle((X+X) ) +transpose(((X|X) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ) ,4) ) +transpose(((((shuffle(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |transpose((X|X) ,-5) ) +transpose(arpeggio(transpose(transpose(X,-5) ,-7) ) ,4) ) +transpose(shuffle((arpeggio(X) |shuffle((X|X) ) ) ) ,7) ) ,7) ) +transpose(transpose(X,4) ,-5) ) ,12) +(shuffle(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ) +transpose(((((transpose(transpose(X,-7) ,-5) +transpose(echo((X+transpose(X,12) ) ,4,6) ,12) ) +transpose(arpeggio(X) ,4) ) +transpose(shuffle(transpose((transpose(X,-5) +X) ,-7) ) ,7) ) +transpose(transpose(arpeggio(X) ,-7) ,7) ) ,12) ) ) ,4) ,7) ) |transpose((arpeggio(echo(((X+transpose(step(X,12) ,12) ) |shuffle(transpose((X+transpose(X,4) ) ,4) ) ) ,4,6) ) |transpose((shuffle((transpose((X+transpose(step(X,12) ,7) ) ,-5) |transpose((X+transpose(X,7) ) ,-7) ) ) +(transpose(transpose(X,4) ,-5) +transpose(((transpose(X,-7) +transpose(transpose((X+(X+X) ) ,-5) ,4) ) +transpose(echo(shuffle((X+transpose(X,7) ) ) ,4,6) ,7) ) ,12) ) ) ,4) ) ,4) ) ,12) ) +transpose((transpose((transpose((echo((transpose(echo(X,4,6) ,-7) +transpose(X,12) ) ,4,6) +transpose((echo((transpose(transpose(X,4) ,-5) +((((X+transpose(X,7) ) +X) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ) ,4,6) +((X|X) +shuffle(X) ) ) ,12) ) ,-5) +transpose(echo((transpose(arpeggio((X|X) ) ,4) +transpose(echo(shuffle(step(X,12) ) ,4,6) ,12) ) ,4,6) ,12) ) ,-5) +transpose(transpose(shuffle(shuffle(shuffle(transpose(transpose(arpeggio(((X+transpose((X+X) ,4) ) +transpose(X,7) ) ) ,-5) ,-5) ) ) ) ,-7) ,12) ) ,4) ) +transpose(echo(transpose(echo((shuffle(arpeggio(shuffle(arpeggio(((X|X) +transpose(X,4) ) ) ) ) ) |((shuffle((transpose((transpose(shuffle(X) ,4) |transpose(X,-5) ) ,4) +transpose(transpose(transpose(transpose(X,4) ,4) ,4) ,7) ) ) |transpose(step(shuffle(transpose(X,-7) ) ,12) ,4) ) +transpose((transpose(shuffle(step((shuffle(shuffle(transpose((X+X) ,-7) ) ) +transpose(transpose((transpose(X,-7) +transpose(transpose(X,4) ,12) ) ,4) ,7) ) ,12) ) ,4) +(((X+transpose(X,12) ) +X) +transpose(transpose(transpose(shuffle((shuffle(X) +(X+transpose(X,12) ) ) ) ,-7) ,-7) ,7) ) ) ,12) ) ) ,4,6) ,-5) ,4,6) ,7) ) ,4) ) )
random seed used was 177436689 EXPR = transpose(step(transpose(shuffle(transpose(transpose((step(transpose((X|X) ,4) ,12) |(shuffle((transpose((transpose(X,4) |shuffle(X) ) ,-7) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,12) ) ) +transpose(shuffle((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +X) ) ,12) ) ) ,4) ,4) ) ,-5) ,12) ,4)
random seed used was 0 EXPR = shuffle(transpose((((transpose((step((transpose(transpose(transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ,-5) ,4) +transpose(transpose(shuffle(transpose(transpose(transpose(transpose(X,4) ,-7) ,-5) ,-7) ) ,-5) ,12) ) ,12) +transpose((transpose(shuffle(((((transpose(X,4) +transpose(X,7) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) |shuffle(X) ) +transpose(transpose(shuffle(shuffle(X) ) ,-5) ,7) ) ) ,-7) +transpose(((echo(transpose(X,4) ,4,6) +transpose(transpose(((X|X) |(shuffle(X) |echo(X,4,6) ) ) ,-5) ,7) ) +transpose(transpose((((X+transpose(X,12) ) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ) +shuffle(X) ) ,4) ,-5) ) ,12) ) ,12) ) ,-5) +step(transpose((shuffle(step((transpose(transpose(transpose(X,4) ,-7) ,-7) |transpose((X|echo(X,4,6) ) ,-5) ) ,12) ) +transpose(transpose(((arpeggio(transpose(step(X,12) ,-7) ) +transpose(((echo((X+transpose(X,12) ) ,4,6) +((X+transpose(X,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ) +arpeggio(((X+transpose((X|X) ,12) ) +transpose(((X+transpose(X,12) ) +transpose((X+X) ,7) ) ,12) ) ) ) ,4) ) +transpose(transpose(shuffle(transpose(X,4) ) ,-7) ,7) ) ,-5) ,7) ) ,4) ,12) ) +transpose(shuffle((transpose(((transpose(((transpose(X,-7) +transpose(transpose((X|X) ,-5) ,7) ) +shuffle(((((step(X,12) |(X|X) ) +(X+X) ) +transpose(((X|X) +transpose(X,4) ) ,4) ) +transpose(shuffle(X) ,7) ) ) ) ,4) +transpose(transpose(transpose(transpose((step(transpose(X,-5) ,12) |step(X,12) ) ,-5) ,-5) ,4) ,4) ) +transpose((shuffle(transpose(shuffle((((X+arpeggio(X) ) +transpose(arpeggio(X) ,4) ) +transpose(arpeggio(transpose((X+transpose(X,7) ) ,4) ) ,7) ) ) ,-7) ) +echo(transpose(((X|(X+transpose(X,12) ) ) +transpose((step(X,12) +transpose(X,4) ) ,12) ) ,-5) ,4,6) ) ,7) ) ,4) +transpose((((step((X|X) ,12) +((((X|X) +transpose(transpose(X,-5) ,12) ) +((X+transpose(X,7) ) +(X+(X|((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ) |transpose(transpose(((X+transpose(transpose(X,4) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ,-5) ) ) |transpose(transpose(transpose((transpose(X,-7) +transpose(X,4) ) ,-7) ,-5) ,-7) ) |shuffle(step(transpose((shuffle(arpeggio((X|X) ) ) +transpose((shuffle(X) +transpose(X,7) ) ,7) ) ,-5) ,12) ) ) ,7) ) ) ,7) ) |(transpose(step(transpose(((shuffle(shuffle(arpeggio(transpose(X,-5) ) ) ) |transpose(transpose(shuffle(X) ,4) ,-7) ) |shuffle(transpose(((X+transpose(X,7) ) |(X+transpose(X,7) ) ) ,4) ) ) ,-5) ,12) ,4) +transpose(transpose(transpose((shuffle(shuffle(transpose(transpose(X,-7) ,4) ) ) |((shuffle(transpose(X,-5) ) +transpose(transpose(((X+transpose((X+transpose(X,12) ) ,12) ) |(X+transpose(X,12) ) ) ,-5) ,4) ) +transpose(transpose(shuffle(transpose(X,-7) ) ,-7) ,7) ) ) ,-7) ,-7) ,12) ) ) ,4) )
random seed used was 0 EXPR = transpose(transpose((((transpose(((shuffle((transpose(arpeggio(X) ,4) +(transpose(X,4) |shuffle(X) ) ) ) +transpose(echo(X,4,6) ,-5) ) +((echo(transpose(X,-7) ,4,6) +transpose(arpeggio(transpose(X,4) ) ,4) ) +transpose(echo(((((transpose(X,-5) |shuffle(X) ) +step(X,12) ) +transpose((X|shuffle(X) ) ,4) ) +transpose(shuffle((transpose(X,-7) +transpose(X,12) ) ) ,7) ) ,4,6) ,7) ) ) ,4) +transpose(shuffle((((step(step(((X+X) +transpose((transpose(X,-7) +transpose(X,7) ) ,7) ) ,12) ,12) +shuffle(transpose(step(X,12) ,-7) ) ) +transpose((((echo(X,4,6) +transpose(transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,4) ,12) ) +(transpose(arpeggio(X) ,4) |shuffle(X) ) ) +transpose((shuffle(arpeggio(shuffle((X+X) ) ) ) +echo(shuffle((transpose(X,-5) +transpose(X,7) ) ) ,4,6) ) ,12) ) ,12) ) |((shuffle(((shuffle(X) +transpose(shuffle((X+X) ) ,7) ) +transpose(transpose(transpose((X|X) ,4) ,-5) ,12) ) ) +(transpose(transpose((X+transpose(X,12) ) ,-7) ,-5) |(transpose(arpeggio(X) ,-7) +transpose(transpose((X|transpose(X,4) ) ,-7) ,12) ) ) ) +transpose((step((((transpose(X,4) |transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,-7) ) +transpose(step(transpose(X,-5) ,12) ,4) ) +transpose(shuffle(arpeggio(transpose(X,-7) ) ) ,7) ) ,12) +transpose(transpose(transpose(((X+transpose(X,7) ) |X) ,4) ,-7) ,12) ) ,7) ) ) ) ,12) ) +transpose(((((transpose(shuffle(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((transpose(X,-7) |step(X,12) ) ,4) ) +transpose(step(X,12) ,7) ) ) ,4) |(step(echo(X,4,6) ,12) |transpose((X|X) ,-5) ) ) +transpose(transpose((shuffle((transpose(transpose(X,4) ,-5) +((shuffle(X) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,4) ,7) ) ) ) +transpose(step(transpose((X+transpose(X,7) ) ,-5) ,12) ,12) ) ,4) ,7) ) +transpose(echo(transpose(shuffle((((echo(X,4,6) +transpose((X|X) ,4) ) +transpose(step(X,12) ,7) ) +echo(X,4,6) ) ) ,-5) ,4,6) ,7) ) |(((shuffle(arpeggio(X) ) |transpose((X+X) ,-5) ) |(X+X) ) +transpose((transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,-7) ,4) +echo((((X|X) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,4,6) ) ,12) ) ) ,4) ) +transpose(step(arpeggio(shuffle(shuffle((transpose(transpose((X+transpose(X,12) ) ,4) ,-7) +shuffle(((X+X) +X) ) ) ) ) ) ,12) ,7) ) ,-5) ,-5)
random seed used was 0

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