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:
 Seed: Randomize seed: Generations: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Phrase for X: Basic 1 - c,e,gBasic 2 - c,g,e,b-Basic 3 - c,gBasic 4 - cBasic 5 - co3,co4,co3,co2Chord 1 - c e gChord 2 - c e- gChord 3 - c e- g b-Chord 4 - c f gFile 1 - bachinv1.midFile 2 - bachinv2.midFile 3 - bachinv3.midFile 4 - bachinv4.midFile 5 - bachinv5.midFile 6 - bachinv6.midFile 7 - bachinv7.midFile 8 - bachinv8.mid # of Tracks: 1234 Randomize patches: noyes Results may not appear for a few seconds.Be patient!
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 After 20 generations the expression "X" became this: (transpose((transpose(transpose(shuffle((arpeggio(transpose(shuffle((X|((X+transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ) ) ,4) ) |(((echo(arpeggio(transpose(transpose(X,4) ,4) ) ,4,6) +transpose(((transpose((X+echo(X,4,6) ) ,-7) +transpose(transpose(((X+X) +transpose(X,7) ) ,-7) ,4) ) +transpose((transpose(arpeggio(X) ,4) +transpose(transpose(X,-7) ,7) ) ,7) ) ,7) ) +(transpose(echo(X,4,6) ,4) +transpose(transpose(X,-5) ,4) ) ) +(((((shuffle(transpose((X+transpose(X,7) ) ,4) ) +((X+transpose(X,7) ) +transpose(((transpose(X,-7) +transpose(transpose(X,-7) ,4) ) +transpose((X+X) ,7) ) ,7) ) ) +((transpose(X,4) |X) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ) +transpose((transpose(X,-5) +transpose(transpose((X+X) ,-7) ,12) ) ,7) ) +transpose(echo(echo(transpose(step(step(X,12) ,12) ,-7) ,4,6) ,4,6) ,4) ) +transpose(transpose(transpose((transpose((X|transpose(X,4) ) ,-5) +((step(step((X|X) ,12) ,12) +transpose((X|X) ,4) ) +transpose(((X+transpose(X,7) ) |transpose((X+transpose(X,12) ) ,-5) ) ,7) ) ) ,-5) ,-7) ,7) ) ) ) ) ,-5) ,-7) +arpeggio((shuffle(transpose((step(step(transpose(((transpose(transpose(transpose((X+X) ,4) ,-5) ,-5) |(transpose(X,-7) +transpose(transpose(X,-5) ,7) ) ) +step(((transpose(arpeggio(X) ,-5) |transpose(transpose(X,4) ,-5) ) +transpose((transpose((X+X) ,4) |arpeggio(X) ) ,7) ) ,12) ) ,4) ,12) ,12) +transpose(transpose(transpose((transpose(echo(transpose(transpose(X,-5) ,4) ,4,6) ,-5) |echo((transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-5) ,4) +transpose(transpose((X+transpose(X,-5) ) ,4) ,7) ) ,4,6) ) ,4) ,-7) ,7) ) ,4) ) +transpose((transpose(((transpose((((transpose(X,4) +transpose(X,7) ) +(((X+X) +(X+transpose(X,7) ) ) +transpose(transpose((X+X) ,4) ,7) ) ) +transpose(arpeggio(step(transpose((X+transpose(X,12) ) ,-7) ,12) ) ,7) ) ,-5) +transpose((((((((echo(((X+transpose(X,12) ) +transpose(X,12) ) ,4,6) +transpose(transpose(transpose(X,-7) ,4) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(echo(arpeggio((X+transpose(X,12) ) ) ,4,6) ,-7) ,12) ) +transpose((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,-5) ,7) ) |step(echo(X,4,6) ,12) ) ,4) ) +transpose(((transpose(X,-5) |(X+transpose(transpose(X,-5) ,7) ) ) +transpose(((X|X) +X) ,12) ) ,7) ) +((X|(X+transpose(X,7) ) ) +transpose((X+transpose(shuffle(X) ,7) ) ,12) ) ) |(transpose(((((X|X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +((step(X,12) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) ) ,4) +transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,-7) ) ) ,12) ) +(((step((arpeggio(X) |(X+transpose(arpeggio(X) ,12) ) ) ,12) +transpose(transpose(shuffle((((step(X,12) +transpose(arpeggio((X+transpose(X,7) ) ) ,4) ) +transpose((transpose(X,-5) +X) ,7) ) +transpose(transpose((X+X) ,-7) ,7) ) ) ,-7) ,7) ) +transpose((((X+X) +transpose(X,12) ) +transpose(((transpose(X,-5) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,-7) ) ,-5) ) +(arpeggio(transpose(echo(transpose(X,-5) ,4,6) ,-7) ) +transpose(transpose((transpose(X,4) |(transpose(transpose(X,-5) ,4) |transpose(X,4) ) ) ,-7) ,12) ) ) ) ,-5) +transpose((transpose(transpose(step(((transpose(shuffle(X) ,-7) +transpose(arpeggio(((((transpose(X,4) +transpose(X,4) ) +transpose(arpeggio(arpeggio(X) ) ,7) ) +transpose(transpose((X+transpose((X+X) ,7) ) ,-5) ,12) ) +transpose((X+((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) ) ,7) ) ) ,4) ) +transpose(transpose(((arpeggio(transpose(X,-7) ) +transpose((X|(X+transpose(X,7) ) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) ,7) ) ,12) ,-7) ,-7) |(transpose(echo(arpeggio(shuffle((X+X) ) ) ,4,6) ,4) +transpose(transpose((((X+transpose(X,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) +shuffle((transpose(X,-7) +transpose((X+transpose(X,7) ) ,12) ) ) ) ,4) ,-7) ) ) ,4) ) ,12) ) ) ) ,-7) +transpose((((transpose(((transpose(transpose((arpeggio(X) |transpose(echo(X,4,6) ,-7) ) ,-7) ,-5) +((transpose(X,-7) +transpose(transpose(transpose(X,-7) ,-7) ,4) ) +transpose(transpose((transpose((transpose(arpeggio(X) ,4) +(echo(X,4,6) +transpose(transpose(X,4) ,7) ) ) ,4) |transpose(transpose((X|(X+transpose(X,7) ) ) ,-7) ,4) ) ,-5) ,12) ) ) +transpose((transpose(transpose((transpose((X+transpose(X,7) ) ,-7) +transpose((((X+X) +transpose(transpose(X,-7) ,7) ) +transpose((transpose(X,-5) +transpose(step(X,12) ,12) ) ,12) ) ,7) ) ,4) ,-7) |(arpeggio(shuffle(echo((X+transpose(X,12) ) ,4,6) ) ) +(echo(arpeggio((X+transpose(X,12) ) ) ,4,6) |((X+transpose(X,-7) ) +shuffle((X+transpose(X,-7) ) ) ) ) ) ) ,7) ) ,-5) +transpose(((step(echo(((shuffle(((X+X) |((X+transpose(transpose(X,-7) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) +transpose((((X+transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) +transpose(shuffle(step((echo(transpose(echo(X,4,6) ,-7) ,4,6) +X) ,12) ) ,12) ) ,4,6) ,12) +transpose(((step(((transpose(X,-7) |step(shuffle(((X+X) +(X+transpose(X,12) ) ) ) ,12) ) |((X+transpose((X+transpose(X,12) ) ,12) ) +transpose((X|X) ,12) ) ) ,12) +transpose(transpose((((transpose(transpose(step(X,12) ,4) ,-5) +transpose(step(transpose(X,-7) ,12) ,12) ) +transpose(transpose(((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ,4) ) +transpose(step(transpose(shuffle((X|transpose(shuffle(X) ,4) ) ) ,-5) ,12) ,7) ) ,-7) ,7) ) +transpose(((transpose(shuffle((arpeggio(X) +((X+X) +(X+X) ) ) ) ,4) +transpose(step(step(step(X,12) ,12) ,12) ,12) ) +((transpose(transpose(arpeggio(transpose((X+(X+X) ) ,-7) ) ,4) ,4) +transpose((((shuffle(shuffle(((X+X) +transpose((X+transpose(X,12) ) ,12) ) ) ) |transpose((((X+transpose((X|X) ,7) ) |(X+transpose(echo(X,4,6) ,7) ) ) |transpose(transpose(X,-5) ,-5) ) ,4) ) +transpose(shuffle(transpose((((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose(X,4) ,12) ) ,-5) ) ,12) ) +transpose(transpose((transpose(X,-7) |transpose(X,-7) ) ,-5) ,7) ) ,4) ) +transpose(shuffle((transpose(transpose(transpose((X+X) ,4) ,4) ,-7) |transpose(shuffle(X) ,4) ) ) ,7) ) ) ,12) ) ,4) ) +transpose((transpose((transpose((X+transpose((X|X) ,12) ) ,-7) +transpose(echo((X+X) ,4,6) ,7) ) ,-7) +transpose((((echo(echo(transpose(transpose((echo(X,4,6) |arpeggio(X) ) ,-5) ,-5) ,4,6) ,4,6) +transpose(arpeggio(transpose(transpose(X,4) ,-5) ) ,4) ) +transpose(step(shuffle(shuffle(transpose(shuffle(X) ,-7) ) ) ,12) ,7) ) |((transpose(step(echo(X,4,6) ,12) ,4) +transpose(X,-5) ) +(shuffle(X) +(transpose(step(X,12) ,4) +X) ) ) ) ,7) ) ,7) ) ,12) ) +transpose(transpose(shuffle((arpeggio(transpose((((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((echo(X,4,6) |(X+transpose(X,7) ) ) |transpose(X,-5) ) ,12) ) |echo(((transpose((X+X) ,-5) +arpeggio((X|X) ) ) +transpose(X,-7) ) ,4,6) ) +transpose(((transpose(((((transpose(X,-5) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(shuffle(X) ,4) ) +transpose(shuffle(X) ,7) ) ,-7) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4) ) +transpose(transpose(shuffle((transpose(X,-5) +echo(X,4,6) ) ) ,4) ,7) ) ,4) ) +transpose(transpose(((X+X) +transpose(transpose(X,-7) ,12) ) ,4) ,7) ) |((transpose(transpose(transpose(transpose(X,4) ,4) ,-7) ,-5) +transpose((arpeggio(X) +transpose((((echo(X,4,6) +transpose((X+transpose(X,12) ) ,7) ) +transpose(X,12) ) |(step(X,12) +transpose(X,7) ) ) ,12) ) ,4) ) +transpose(shuffle(arpeggio(transpose((arpeggio(X) |transpose(X,4) ) ,-7) ) ) ,7) ) ) ,-5) ) +transpose((((transpose(shuffle(((transpose(X,4) |X) |transpose((X+transpose(X,12) ) ,-7) ) ) ,4) +transpose(transpose(arpeggio(X) ,-7) ,4) ) +transpose(((transpose(arpeggio(transpose(X,-7) ) ,-5) +transpose(shuffle(echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(transpose((X|X) ,-5) ) ,7) ) ,4,6) ) ,4) ) +transpose(step((shuffle(((shuffle(X) +transpose(X,12) ) +shuffle((X+X) ) ) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,12) ) ,12) ,7) ) ,7) ) +transpose(((step((step(transpose(X,-5) ,12) +transpose(step((X+X) ,12) ,7) ) ,12) |(transpose(((shuffle(X) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose((transpose(X,-7) +X) ,7) ) ,-7) +((X+X) +transpose(arpeggio((X+transpose(X,12) ) ) ,12) ) ) ) +transpose(echo(transpose(transpose(((((X+transpose(shuffle(echo(X,4,6) ) ,7) ) +transpose((X|X) ,4) ) +transpose((X|transpose(X,-5) ) ,7) ) +(X+transpose(transpose(X,-7) ,12) ) ) ,4) ,-7) ,4,6) ,12) ) ,12) ) ,-7) ) ) ,4) ,12) ) +transpose(((step(((((step((((transpose(transpose(X,-7) ,-7) +transpose(transpose(shuffle(transpose(X,4) ) ,-5) ,4) ) +transpose(transpose((transpose(X,-7) |echo(X,4,6) ) ,-5) ,7) ) +transpose(shuffle(transpose(X,4) ) ,7) ) ,12) |step(transpose(transpose((X+X) ,-5) ,4) ,12) ) +transpose((transpose(step((transpose(X,-5) +transpose((shuffle(X) |(X+transpose(X,7) ) ) ,7) ) ,12) ,-7) +((transpose(echo(arpeggio((transpose(X,4) +transpose(transpose(X,4) ,12) ) ) ,4,6) ,4) |arpeggio(transpose((X+X) ,-5) ) ) +transpose((transpose((arpeggio(X) +transpose((transpose(X,-5) |(X+transpose(X,7) ) ) ,12) ) ,-5) |(((transpose(X,4) |X) +(X+transpose(X,7) ) ) +transpose(((X+transpose(X,12) ) +(X+X) ) ,12) ) ) ,12) ) ) ,12) ) +transpose((echo(shuffle((transpose((((transpose(X,4) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) |(arpeggio(X) |transpose(X,-7) ) ) ,-7) |((transpose(((X+X) |arpeggio(X) ) ,-5) +transpose(arpeggio(transpose(X,-5) ) ,4) ) +transpose(transpose(echo((X+X) ,4,6) ,-5) ,7) ) ) ) ,4,6) +transpose(step(((transpose(arpeggio(((X|X) +transpose(transpose(arpeggio(X) ,-5) ,7) ) ) ,4) +(((X|X) +transpose((X|X) ,12) ) |echo(X,4,6) ) ) |(((transpose((transpose(X,-7) |transpose(X,-7) ) ,-7) +transpose((transpose((X|(X+X) ) ,4) +(arpeggio(arpeggio(X) ) +X) ) ,4) ) +transpose(transpose(transpose(((X|X) +transpose(step(X,12) ,7) ) ,4) ,-5) ,7) ) +transpose(transpose(echo(transpose((((transpose(X,4) |transpose(X,4) ) +transpose(arpeggio(step(X,12) ) ,4) ) +transpose((X+transpose(transpose(X,-5) ,12) ) ,7) ) ,-5) ,4,6) ,4) ,12) ) ) ,12) ,12) ) ,12) ) |transpose(arpeggio(step(((transpose((transpose(transpose(transpose(X,-5) ,4) ,-5) +((X+transpose(shuffle(X) ,7) ) |transpose((X|X) ,-7) ) ) ,-5) +transpose(echo(((((X|X) |X) +transpose((X+arpeggio(X) ) ,12) ) |(transpose(X,4) |(X+X) ) ) ,4,6) ,4) ) +transpose((arpeggio(((transpose(step(X,12) ,4) +transpose(step(X,12) ,4) ) +transpose(((X+transpose(X,7) ) +X) ,7) ) ) +transpose((transpose(X,4) +transpose(shuffle((X+X) ) ,12) ) ,7) ) ,7) ) ,12) ) ,-7) ) ,12) |((((((X+(((transpose(X,-7) +transpose((X|X) ,4) ) +transpose(transpose(X,4) ,7) ) |X) ) +transpose((transpose((step(X,12) |transpose(arpeggio(X) ,-7) ) ,-7) +transpose(echo((arpeggio(X) |transpose(X,4) ) ,4,6) ,7) ) ,4) ) +transpose(transpose(arpeggio((((X+transpose(X,12) ) +transpose(X,4) ) +transpose((X|X) ,7) ) ) ,-5) ,7) ) +transpose(echo((shuffle(shuffle(X) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,4,6) ,-7) ) +transpose(transpose(((((arpeggio(shuffle(transpose(X,-7) ) ) +transpose((echo(((X+X) +transpose((X+X) ,7) ) ,4,6) +transpose(transpose(transpose(X,-5) ,-7) ,12) ) ,7) ) +transpose(transpose((arpeggio((((X|transpose(X,-5) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) ) |step(X,12) ) ,-5) ,4) ) +transpose((arpeggio(X) +transpose((X+X) ,-5) ) ,7) ) +transpose(transpose(echo(transpose(((X|X) +(echo(X,4,6) |X) ) ,-7) ,4,6) ,-5) ,7) ) ,-7) ,12) ) +transpose((((arpeggio(transpose(step(transpose(((((X|X) +transpose(step(X,12) ,12) ) |X) |transpose(arpeggio((X+X) ) ,-5) ) ,-7) ,12) ,-7) ) +transpose(((echo(transpose(((((X+transpose((X|X) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose((X+(X|X) ) ,12) ) |echo(step(X,12) ,4,6) ) ,-5) ,4,6) +transpose(transpose(transpose(transpose(arpeggio(transpose((echo(X,4,6) +X) ,4) ) ,4) ,-5) ,4) ,4) ) +transpose(shuffle(((((X+transpose(echo(X,4,6) ,7) ) +(X|X) ) +transpose((X|transpose(transpose(X,-5) ,4) ) ,4) ) |transpose(X,4) ) ) ,7) ) ,4) ) +transpose(echo(step(((transpose(transpose(echo(((transpose(X,-7) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4,6) ,4) ,-7) +transpose((((((transpose(transpose(X,4) ,4) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(transpose(((X+X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,-5) ,4) ) +transpose((shuffle(X) +transpose(transpose((step(X,12) +transpose(step(X,12) ,12) ) ,-5) ,12) ) ,7) ) |transpose(transpose((X+transpose(X,-7) ) ,-5) ,-5) ) +transpose((transpose(X,4) +transpose(transpose(transpose(X,-5) ,4) ,-7) ) ,7) ) ,4) ) +transpose(transpose(arpeggio(transpose(transpose(transpose((X+X) ,-7) ,-7) ,-5) ) ,-5) ,7) ) ,12) ,4,6) ,7) ) +(((arpeggio(((shuffle(X) +transpose(X,-5) ) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose((shuffle(X) +transpose((X+transpose(X,12) ) ,-7) ) ,12) ) |((((echo(X,4,6) +transpose(X,-5) ) +transpose((transpose(X,-7) +transpose(arpeggio(X) ,12) ) ,12) ) +transpose((X|transpose(X,4) ) ,4) ) +transpose(shuffle(arpeggio(X) ) ,7) ) ) +transpose(step(((transpose((X|X) ,-7) |X) |((X|X) +shuffle(X) ) ) ,12) ,-7) ) ) ,7) ) ) +step(shuffle((((((transpose(transpose(echo(X,4,6) ,-7) ,-7) +transpose(((transpose((X|transpose(X,-5) ) ,4) +transpose(echo((((echo(X,4,6) +transpose(X,-5) ) |transpose((X+X) ,4) ) +transpose(step(shuffle(step(X,12) ) ,12) ,7) ) ,4,6) ,4) ) +transpose((step(arpeggio(X) ,12) +((transpose((X|X) ,-5) |X) |arpeggio((X+transpose(echo(X,4,6) ,7) ) ) ) ) ,7) ) ,7) ) +transpose((((X+X) |X) |(X+X) ) ,-5) ) +transpose(transpose(((transpose((transpose(X,-7) |shuffle(X) ) ,4) +transpose((step((((X+X) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,4) ) +transpose(step((transpose(X,4) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,7) ) ,4) ,7) ) +transpose(shuffle((((((((X+transpose(X,12) ) +transpose(X,12) ) |echo(X,4,6) ) +transpose((X+transpose(X,-5) ) ,7) ) +transpose(shuffle((X+X) ) ,4) ) +transpose(echo(((arpeggio((X+transpose(X,12) ) ) +transpose((transpose(X,-7) |X) ,12) ) +((X|transpose(X,-7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4,6) ,7) ) |(transpose((arpeggio(X) |echo((X+transpose(X,7) ) ,4,6) ) ,-5) +transpose(((((transpose(X,-7) +transpose(step(X,12) ,12) ) |((X+X) +transpose((X+X) ,12) ) ) +transpose(transpose((X+transpose(X,-7) ) ,-7) ,7) ) +transpose((transpose((X+X) ,-5) +transpose(transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,7) ) ,7) ) ,7) ) ) ) ,4) ) +transpose((transpose(echo(((((X+transpose((transpose(X,-7) +transpose((X+X) ,12) ) ,4) ) +transpose((((X|X) |X) +transpose((X+X) ,12) ) ,7) ) +transpose(arpeggio(transpose(X,-5) ) ,4) ) +transpose(transpose(((X+X) +step(X,12) ) ,4) ,7) ) ,4,6) ,4) +transpose(((step((arpeggio((((((X+transpose(X,12) ) +(X+transpose(X,7) ) ) +(X+(X+X) ) ) |transpose(transpose(X,4) ,-5) ) +transpose(transpose(((X|X) +X) ,-7) ,12) ) ) +(transpose((echo(transpose((X+transpose(X,7) ) ,-7) ,4,6) +transpose(transpose(X,4) ,12) ) ,4) |(transpose((step(X,12) +X) ,4) +((step(X,12) +transpose(transpose(arpeggio(X) ,4) ,7) ) +transpose(X,-7) ) ) ) ) ,12) +transpose((transpose((arpeggio((((X+X) +transpose(shuffle(transpose(X,-5) ) ,4) ) +transpose(((X|X) |(X+transpose(X,12) ) ) ,7) ) ) +(echo(arpeggio(transpose((X+transpose(X,12) ) ,-5) ) ,4,6) |((X+X) +transpose((X+transpose(X,7) ) ,7) ) ) ) ,-7) |transpose(X,-7) ) ,4) ) +transpose((transpose(shuffle((X+X) ) ,4) +((step(X,12) +transpose(X,12) ) |transpose(transpose(X,-7) ,4) ) ) ,7) ) ,7) ) ,7) ) ) ,12) ) ,12) ) ,7) ) random seed used was 131016709

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