Tune Toys : Expresso

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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.

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After 19 generations the expression "X" became this:

(transpose(((transpose(transpose(echo(step(transpose(transpose((echo(X,4,6) +((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,-7) ,-7) ,12) ,4,6) ,-7) ,-5) +transpose(transpose(((transpose(shuffle(((((((arpeggio((((X+X) +transpose((X|X) ,4) ) +transpose(shuffle(X) ,7) ) ) |X) +(shuffle(X) +(transpose(X,4) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ) ) |(transpose((((X|X) +transpose((shuffle(transpose(X,-7) ) +X) ,4) ) +transpose(X,7) ) ,-5) |transpose(transpose(echo(X,4,6) ,-7) ,-5) ) ) +(X+(arpeggio(transpose(X,4) ) |X) ) ) +transpose((((transpose((((X|X) +transpose(transpose(X,-5) ,4) ) +transpose(step(X,12) ,7) ) ,-5) +transpose(transpose(step(X,12) ,-7) ,-5) ) +transpose((shuffle((X+X) ) |transpose(transpose(transpose(arpeggio(X) ,-7) ,-7) ,-5) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ,4) ) +transpose(((transpose((shuffle(transpose((X+transpose(X,7) ) ,-5) ) +(X+transpose(X,7) ) ) ,-7) +transpose(shuffle(((((X|X) +transpose((X+transpose(X,12) ) ,7) ) +transpose(transpose(transpose(X,-5) ,4) ,12) ) +transpose(transpose(transpose((X+X) ,4) ,-7) ,12) ) ) ,12) ) +echo(arpeggio((((echo(X,4,6) +transpose(echo(transpose(X,-5) ,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) |((((X|X) +transpose(((X+transpose(X,12) ) |X) ,4) ) +transpose((X|transpose(X,-7) ) ,7) ) +transpose(transpose((X+step(X,12) ) ,4) ,12) ) ) ) ,4,6) ) ,7) ) ) ,4) |arpeggio(((transpose((((X|X) |transpose(X,-7) ) +(((X+transpose((X|X) ,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,-5) +transpose(shuffle(((step((arpeggio(X) +transpose(transpose(X,-5) ,-7) ) ,12) |(shuffle((echo(X,4,6) +transpose(X,7) ) ) |arpeggio(X) ) ) |(X+transpose((X+transpose(X,12) ) ,12) ) ) ) ,4) ) +transpose(transpose(step(transpose(transpose(arpeggio(((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,12) ) ) ,-5) ,4) ,12) ,-7) ,7) ) ) ) +transpose(transpose((transpose(transpose(((transpose((transpose(X,-5) +transpose(echo(X,4,6) ,12) ) ,-5) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose(echo(transpose(transpose(X,-7) ,4) ,4,6) ,7) ) ,4) ,-5) +transpose(transpose(((transpose(arpeggio(X) ,-5) +transpose(shuffle((((X|step(X,12) ) |transpose(X,-5) ) |arpeggio((transpose((X|X) ,-5) |echo(X,4,6) ) ) ) ) ,7) ) |shuffle((transpose(((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) +(((X|X) +shuffle(X) ) +transpose((arpeggio(X) +echo(X,4,6) ) ,12) ) ) ) ) ,-7) ,7) ) ,-5) ,7) ) ,-5) ,4) ) +transpose(((((transpose(((X+shuffle((X+transpose(X,7) ) ) ) +((((X+(X+X) ) +transpose(transpose(X,4) ,4) ) +transpose((X+(X|X) ) ,7) ) |(X+X) ) ) ,-5) +(((echo((X|X) ,4,6) +transpose((transpose(transpose(X,4) ,-5) +transpose(arpeggio(transpose(X,-5) ) ,12) ) ,12) ) |((step((step(transpose(X,4) ,12) |(X+X) ) ,12) +transpose(((transpose(arpeggio(X) ,4) +transpose((((step(X,12) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) +(X|X) ) ,4) ) +transpose(transpose(((transpose(X,-5) +X) +transpose(X,-5) ) ,-7) ,7) ) ,4) ) +transpose(transpose(((X+transpose(transpose(X,-5) ,12) ) +(X+transpose(X,12) ) ) ,4) ,7) ) ) +transpose(((((X+transpose(X,12) ) +(X+X) ) |arpeggio(step(transpose(transpose(X,4) ,-5) ,12) ) ) +transpose(transpose(((((X|X) +transpose(X,12) ) +X) +transpose((shuffle(X) |(X+transpose(X,12) ) ) ,7) ) ,4) ,7) ) ,12) ) ) |shuffle(((((X+transpose(step(X,12) ,7) ) +transpose((transpose((X|X) ,-7) +transpose(echo((X|arpeggio(X) ) ,4,6) ,12) ) ,4) ) +transpose((step(((arpeggio(X) +(X|X) ) +transpose((echo(X,4,6) +transpose((X|X) ,12) ) ,12) ) ,12) |arpeggio(transpose(shuffle(transpose(shuffle(X) ,4) ) ,-5) ) ) ,4) ) +transpose(shuffle(shuffle((X+transpose(transpose(X,-5) ,12) ) ) ) ,7) ) ) ) +transpose((transpose((transpose((X+transpose(transpose(X,4) ,12) ) ,-5) +(X|transpose(X,-5) ) ) ,-7) +transpose(((shuffle((((transpose((transpose((X|X) ,-7) +transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,12) ) ,-7) +transpose(((transpose(X,4) +(X|X) ) +transpose(echo(X,4,6) ,7) ) ,12) ) +transpose(transpose(((transpose(transpose(shuffle(X) ,4) ,-7) +transpose(step(echo(transpose(X,-5) ,4,6) ,12) ,4) ) +transpose(echo(arpeggio(transpose(X,-7) ) ,4,6) ,7) ) ,4) ,4) ) +transpose(echo(((X|X) +transpose((X+transpose(arpeggio(X) ,7) ) ,12) ) ,4,6) ,7) ) ) +transpose(transpose(step(transpose(step(X,12) ,4) ,12) ,4) ,4) ) +transpose(transpose(((X+transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(transpose((X|X) ,-7) ,7) ) ,-5) ,7) ) ,7) ) ,7) ) +transpose(((transpose((arpeggio(shuffle(((X|(X+transpose(X,7) ) ) +echo((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(step(X,12) ,12) ) ,4,6) ) ) ) |((step(((((X+transpose(X,7) ) +transpose(shuffle(X) ,7) ) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,12) +transpose((((transpose(X,4) +transpose((X+transpose(X,12) ) ,12) ) +transpose(transpose(X,-5) ,12) ) +step(transpose((X+X) ,-7) ,12) ) ,12) ) |transpose((arpeggio(echo((transpose(X,4) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) ) +transpose(arpeggio(((X+transpose(X,12) ) +(X+transpose(X,7) ) ) ) ,12) ) ,-5) ) ) ,-7) +transpose(shuffle(((transpose(transpose(transpose(transpose(((((transpose((X+X) ,-7) |((transpose(X,-5) +transpose((X+X) ,4) ) +transpose((X|X) ,7) ) ) +transpose(arpeggio(transpose(transpose(X,-5) ,-5) ) ,12) ) +transpose((((transpose(X,4) +step((transpose(X,4) |X) ,12) ) +transpose((X+X) ,4) ) +transpose(arpeggio(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,7) ) ,4) ) +transpose(transpose((X+transpose(transpose(X,-7) ,7) ) ,-7) ,7) ) ,-5) ,4) ,4) ,-7) +transpose(echo((((transpose(echo((X+X) ,4,6) ,-5) |(shuffle((X|(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ) ) |((transpose((transpose(X,-7) +transpose(transpose(X,-5) ,7) ) ,4) +transpose(transpose((((X|X) +transpose((X+X) ,4) ) +transpose((X+transpose(X,12) ) ,12) ) ,4) ,4) ) +transpose(transpose(((echo(((X+transpose(X,4) ) +transpose((X+X) ,7) ) ,4,6) +transpose(transpose(X,4) ,4) ) +transpose(transpose((shuffle(X) +(X+transpose(X,12) ) ) ,-7) ,7) ) ,4) ,7) ) ) ) +transpose(transpose(transpose(transpose(transpose(X,4) ,4) ,-5) ,-7) ,4) ) +transpose((echo(transpose(echo(arpeggio(X) ,4,6) ,-7) ,4,6) |transpose(shuffle((X+transpose((X+transpose(X,12) ) ,12) ) ) ,-5) ) ,7) ) ,4,6) ,4) ) +transpose((step(step(transpose((((X|X) +transpose(X,7) ) +transpose(step(X,12) ,12) ) ,4) ,12) ,12) +transpose((transpose((((transpose(X,4) +transpose(X,4) ) +(transpose(X,-7) |(arpeggio(X) |X) ) ) +arpeggio(transpose(((X+X) +transpose(X,-7) ) ,4) ) ) ,-7) +transpose(shuffle(((X+transpose(shuffle(X) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,-7) ) ,4) ) ,7) ) ) ,4) ) +transpose(((transpose(step((transpose(((transpose(((X+transpose(X,12) ) +(X|X) ) ,4) +transpose(transpose((X|X) ,-7) ,4) ) +transpose(transpose(X,4) ,7) ) ,-7) +transpose(((transpose(echo(echo(X,4,6) ,4,6) ,-7) +transpose(arpeggio((transpose(X,-5) +transpose((X+X) ,12) ) ) ,12) ) +(X+X) ) ,-5) ) ,12) ,-5) +transpose(transpose(arpeggio((transpose(((transpose(X,-7) +(X|X) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) ,-7) +transpose(((((X+(transpose(X,4) |X) ) +transpose(shuffle((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,12) ) |(((X+transpose((X+X) ,12) ) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) +((transpose(X,-5) |X) |step(X,12) ) ) ) +(echo(((transpose(X,-5) +transpose((transpose(X,-5) +transpose(echo(X,4,6) ,12) ) ,4) ) +transpose((X|X) ,7) ) ,4,6) |(shuffle((X|X) ) +transpose(((X+transpose(X,7) ) |(X+transpose(X,7) ) ) ,12) ) ) ) ,12) ) ) ,-5) ,7) ) |(((arpeggio(transpose(transpose(transpose((X+transpose(transpose(transpose(X,-5) ,4) ,7) ) ,-5) ,-7) ,4) ) +(shuffle(((transpose(X,-7) +transpose(shuffle(transpose(X,-7) ) ,12) ) +transpose(((X+transpose(step(X,12) ,4) ) +transpose(arpeggio((X+X) ) ,7) ) ,12) ) ) +(((((transpose(X,-7) |(transpose(X,4) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) ) +transpose(transpose((X+transpose(transpose(X,4) ,7) ) ,-5) ,7) ) +transpose(transpose(((transpose(step(step(X,12) ,12) ,4) +X) +transpose(transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,12) ) ,-7) ,4) ) +transpose(transpose((transpose(X,-7) +transpose((X|X) ,7) ) ,-7) ,7) ) +shuffle((((X+step(X,12) ) +transpose(((X|X) +transpose((X|X) ,12) ) ,7) ) +X) ) ) ) ) +transpose(step(((transpose(echo(((transpose(X,-5) +(X|X) ) +(step(X,12) |echo(X,4,6) ) ) ,4,6) ,-7) |(((transpose(arpeggio(X) ,-7) +transpose((transpose(transpose(X,4) ,-5) +(X+transpose(X,7) ) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(transpose((transpose(X,4) |step(transpose(X,-7) ,12) ) ,-5) ,7) ) ) +transpose(((step((((((X+X) +transpose(arpeggio(X) ,4) ) +transpose(shuffle(step(X,12) ) ,7) ) +transpose(((X+X) +transpose(X,7) ) ,4) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ,12) +transpose(transpose((transpose(shuffle(X) ,-5) |step(X,12) ) ,-5) ,4) ) +transpose(transpose(transpose(transpose(echo(X,4,6) ,4) ,-7) ,4) ,7) ) ,12) ) ,12) ,4) ) +transpose((transpose(echo(shuffle(transpose(X,-5) ) ,4,6) ,-5) +transpose((transpose(transpose(shuffle(X) ,-7) ,-5) |transpose(shuffle(transpose((step(X,12) +(X+transpose(X,12) ) ) ,-7) ) ,4) ) ,12) ) ,7) ) ) ,7) ) ,12) ) ,7) ) ,-5) |(transpose((((((transpose((((((step(X,12) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) +transpose(X,4) ) +shuffle((X+X) ) ) +transpose((transpose(transpose(echo(X,4,6) ,-5) ,-5) +transpose((transpose(X,-5) +transpose(step(X,12) ,7) ) ,12) ) ,12) ) ,-5) +(transpose(transpose(X,-5) ,4) +((transpose(step(step(transpose((X+X) ,4) ,12) ,12) ,4) +transpose(transpose((transpose(X,-5) +X) ,-5) ,4) ) +transpose(((step((step(step(X,12) ,12) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,4) ) ,12) ) ,12) +echo((X+transpose(X,7) ) ,4,6) ) +((arpeggio(X) |transpose(X,4) ) |(X+transpose(X,12) ) ) ) ,7) ) ) ) +transpose(echo((transpose(step((((transpose((X|X) ,-7) +transpose((X|X) ,4) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,12) ,-5) |(arpeggio(arpeggio(transpose(X,-7) ) ) +transpose(((X+transpose(transpose(X,4) ,7) ) +((transpose(X,-5) +transpose(echo(X,4,6) ,4) ) +transpose((X+X) ,7) ) ) ,7) ) ) ,4,6) ,4) ) +transpose(transpose(echo((transpose((((X+transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) |transpose(transpose((X+transpose(X,7) ) ,-7) ,-7) ) ,4) +transpose(echo(step(arpeggio(X) ,12) ,4,6) ,7) ) ,4,6) ,-5) ,7) ) +transpose(((transpose(((transpose((X+(transpose(X,-5) +transpose((X+X) ,7) ) ) ,-7) +transpose(((transpose(transpose(X,4) ,4) |arpeggio(step(X,12) ) ) +transpose(arpeggio(((X+transpose(transpose(X,4) ,4) ) +transpose((X+X) ,7) ) ) ,4) ) ,4) ) +transpose(step((transpose((echo(X,4,6) +(transpose(X,-5) +transpose(((X+transpose(X,12) ) |X) ,7) ) ) ,4) +transpose(((transpose((X+transpose(shuffle(X) ,12) ) ,-7) +transpose((arpeggio((transpose(X,4) +transpose(X,-7) ) ) +transpose(X,-5) ) ,4) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,7) ) ,12) ,7) ) ,4) |(echo((((step(X,12) +transpose(echo(((X|X) +echo(X,4,6) ) ,4,6) ,4) ) +transpose(step(arpeggio(X) ,12) ,7) ) +shuffle((transpose(transpose(X,-5) ,-5) +(step(X,12) +transpose(arpeggio(X) ,12) ) ) ) ) ,4,6) +transpose(step(shuffle(shuffle(X) ) ,12) ,7) ) ) |transpose(shuffle(arpeggio((step((X|X) ,12) +transpose(arpeggio(((X+X) +transpose(X,-5) ) ) ,7) ) ) ) ,-5) ) ,12) ) +transpose(transpose(transpose(transpose(echo((transpose((transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(transpose(X,-7) ,12) ) ,-5) +((((X+transpose(X,4) ) +transpose(X,7) ) |X) +((X+transpose(X,7) ) +transpose((arpeggio(arpeggio(X) ) |X) ,12) ) ) ) ,-7) +transpose(echo(transpose(echo(transpose(X,-7) ,4,6) ,-7) ,4,6) ,12) ) ,4,6) ,-7) ,4) ,-5) ,12) ) ,-5) |arpeggio(((transpose((step((arpeggio(echo((X+transpose(X,12) ) ,4,6) ) +((((transpose(X,4) +transpose((transpose(step(X,12) ,-7) |(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose((X|X) ,12) ) ) ,4) ) +transpose((X+X) ,7) ) +transpose(transpose(step(X,12) ,-5) ,7) ) |transpose((echo(X,4,6) +step((transpose(X,-5) |((X+transpose(X,7) ) +(X+transpose(X,7) ) ) ) ,12) ) ,4) ) ) ,12) +transpose((echo(((transpose(transpose(X,4) ,4) +transpose(((step(transpose(shuffle(X) ,-5) ,12) +transpose(echo(arpeggio(X) ,4,6) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(((transpose(shuffle(X) ,-7) +transpose(shuffle(transpose(X,-5) ) ,12) ) |(shuffle(((X+transpose(X,12) ) |X) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) ) ,7) ) ,4,6) +(transpose((((transpose(arpeggio(X) ,-5) +transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(((transpose(X,-7) +X) +transpose(X,7) ) ,7) ) ,-7) +transpose(step(transpose(transpose((((transpose(X,-7) +transpose(transpose(X,4) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(X,12) ) ,4) ,4) ,12) ,12) ) ) ,12) ) ,-5) +transpose((((transpose((((transpose(transpose(arpeggio(X) ,4) ,-5) +transpose(transpose(echo(((X+X) +transpose(X,-7) ) ,4,6) ,-5) ,4) ) +transpose(((((transpose(X,4) +transpose(X,7) ) +transpose((X|(X+X) ) ,4) ) +transpose((X+transpose(echo(X,4,6) ,7) ) ,7) ) |X) ,7) ) +(((transpose(transpose(X,4) ,-7) +transpose((X+X) ,-5) ) +transpose(transpose(((X+transpose((X+X) ,12) ) |(X+X) ) ,4) ,4) ) +transpose(transpose((((X+transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ,4) ,7) ) ) ,-7) |(arpeggio((transpose(((X|X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) |shuffle(transpose(step(X,12) ,-7) ) ) ) +(((step(((transpose((step(X,12) +transpose(X,7) ) ,-7) +transpose(echo(arpeggio(X) ,4,6) ,7) ) +transpose((transpose(X,4) |transpose(X,-5) ) ,4) ) ,12) +transpose(step((X+transpose((X+(X|X) ) ,12) ) ,12) ,4) ) +transpose((transpose(echo(X,4,6) ,-7) |transpose((((X+X) |transpose(X,-7) ) +transpose(transpose(X,-5) ,7) ) ,-5) ) ,7) ) +transpose(arpeggio((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(X,-5) ) ) ,7) ) ) ) +transpose(transpose((transpose(echo(step((X+transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,12) ,4,6) ,4) +((transpose(((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X+transpose(X,7) ) ) ,-5) +transpose(transpose((echo(X,4,6) +(transpose(X,-5) |shuffle(X) ) ) ,-7) ,4) ) +transpose((transpose(transpose(X,-5) ,-5) +transpose(((X+X) |shuffle(X) ) ,7) ) ,7) ) ,4) +transpose(((((X|transpose(X,4) ) +transpose(shuffle(X) ,4) ) +transpose(transpose((step(X,12) +transpose(transpose(X,4) ,7) ) ,4) ,7) ) +step(X,12) ) ,12) ) +(transpose(echo((X|(X|X) ) ,4,6) ,4) |(shuffle(transpose(transpose(transpose(echo(X,4,6) ,-7) ,-5) ,4) ) |((echo(transpose(X,-5) ,4,6) +(X|transpose(X,4) ) ) +step((transpose(X,4) +(X+X) ) ,12) ) ) ) ) ) ,4) ,4) ) +transpose(step(echo((transpose((shuffle(transpose(X,-5) ) |(arpeggio(transpose(arpeggio(X) ,4) ) +(step(arpeggio(X) ,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ) ,4) +shuffle(transpose(X,4) ) ) ,4,6) ,12) ,7) ) ,12) ) |(transpose((transpose(transpose(echo((transpose(X,-7) +transpose(transpose(X,4) ,7) ) ,4,6) ,-7) ,-5) +transpose(arpeggio(((((transpose(((X+X) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ,4) +transpose(X,4) ) +transpose(((X+transpose(echo(X,4,6) ,7) ) +transpose((X+transpose(X,-5) ) ,4) ) ,7) ) +transpose((transpose((transpose(X,4) +transpose(arpeggio(X) ,7) ) ,-5) +transpose(echo(transpose(X,4) ,4,6) ,12) ) ,4) ) +transpose(((X|(X|X) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,7) ) ) ,12) ) ,-7) |shuffle((transpose(transpose((transpose(echo((X+X) ,4,6) ,-5) +transpose(step((((transpose(X,-5) +transpose((X+X) ,4) ) +transpose(X,7) ) +transpose(step(X,12) ,12) ) ,12) ,12) ) ,-7) ,4) +((step((step(((X|transpose(X,-5) ) |((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,12) +(transpose(((arpeggio(X) +transpose(transpose(X,-5) ,12) ) +transpose(((X+X) |(X|X) ) ,12) ) ,-5) +transpose(((transpose(transpose(X,-7) ,4) +transpose((transpose(X,-7) +X) ,4) ) +transpose((transpose(transpose(X,4) ,-7) +step(X,12) ) ,7) ) ,12) ) ) ,12) +transpose((((transpose((step(X,12) +(X+transpose(X,12) ) ) ,-7) +transpose(((transpose(transpose(X,4) ,4) +((X+transpose((X+X) ,12) ) +transpose(transpose(X,-7) ,-5) ) ) +((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) ) ,12) ) +transpose(transpose(transpose(shuffle(((echo(X,4,6) +transpose(transpose(X,-5) ,4) ) +transpose((X|X) ,7) ) ) ,-5) ,-5) ,12) ) +transpose((step((X+transpose(X,7) ) ,12) +echo(((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +echo(X,4,6) ) |(((X|X) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ) ,4,6) ) ,12) ) ,4) ) +transpose(arpeggio(echo(step((X+X) ,12) ,4,6) ) ,7) ) ) ) ) ) ) ) )
random seed used was 73999089

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