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 19 generations the expression "X" became this: (((transpose(echo(echo((((((((step((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,12) |(((X+transpose(X,4) ) +transpose(X,7) ) +X) ) +transpose(step(echo(X,4,6) ,12) ,4) ) +transpose(X,7) ) +transpose(transpose((X+X) ,4) ,12) ) |step(transpose(((X+transpose(X,-7) ) |transpose(X,-7) ) ,-7) ,12) ) +transpose(transpose(echo((X+arpeggio(X) ) ,4,6) ,-5) ,-7) ) +transpose(transpose(transpose(((transpose((step(X,12) |arpeggio(X) ) ,-5) +transpose(transpose((X|X) ,-5) ,-5) ) +((((X+transpose(X,4) ) +transpose(X,7) ) |(((X+X) +transpose(X,4) ) +transpose(X,7) ) ) +transpose(((X+transpose(X,7) ) +(X+transpose(X,7) ) ) ,12) ) ) ,-5) ,4) ,-5) ) ,4,6) ,4,6) ,-7) +transpose((shuffle(step(((((arpeggio(step((transpose(transpose(X,-5) ,-7) |transpose((X+X) ,-5) ) ,12) ) +transpose((transpose(step(((X+transpose((transpose(step(X,12) ,-7) +transpose(transpose(X,-5) ,-5) ) ,4) ) +transpose((((X+transpose(X,7) ) |(X+transpose((X+X) ,12) ) ) |transpose(shuffle(X) ,-7) ) ,7) ) ,12) ,-7) +transpose((((transpose(transpose(transpose(X,-5) ,-5) ,-5) +echo(((X+transpose(X,7) ) +(X+transpose(X,7) ) ) ,4,6) ) +transpose(shuffle(X) ,7) ) |transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ) ,12) ) ,12) ) |(step(echo(transpose((X|X) ,-7) ,4,6) ,12) +transpose((((arpeggio(transpose(X,-5) ) +step(shuffle(X) ,12) ) +transpose(((X+((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose((X+X) ,7) ) ) |((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(((X+X) |echo(X,4,6) ) ,7) ) ) ,4) ) +transpose(shuffle((((X+transpose(X,12) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) +transpose(transpose(((X+transpose(X,7) ) |echo(X,4,6) ) ,4) ,12) ) ) ,7) ) ,7) ) ) |(shuffle(transpose((((echo(X,4,6) +((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,4) ,7) ) ) +transpose(transpose(X,-7) ,-7) ) +step(arpeggio(((X+transpose((X+X) ,4) ) +transpose(X,7) ) ) ,12) ) ,4) ) +transpose(shuffle(echo((step(arpeggio((X+X) ) ,12) +arpeggio(((X|X) +X) ) ) ,4,6) ) ,4) ) ) +transpose(((shuffle(transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ) ,4) ) +transpose(transpose(shuffle(step(arpeggio(X) ,12) ) ,4) ,12) ) |(arpeggio(((transpose(step(X,12) ,-7) +transpose(X,12) ) +((transpose(X,-7) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(X,-7) ,4) ) ) ) +transpose(((X+X) +((transpose((X|X) ,4) +transpose(arpeggio((X+X) ) ,12) ) +(((X+X) +transpose(X,12) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,7) ) ,12) ) ) ) ,7) ) ) ,-5) ) ,12) ) |(((transpose((transpose(echo(transpose(((X+transpose((X+X) ,7) ) |echo(X,4,6) ) ,-5) ,4,6) ,-7) +transpose((((shuffle(echo(transpose(X,4) ,4,6) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,12) ) +step(transpose(X,-5) ,12) ) +transpose(((((transpose(X,-7) +transpose(X,-5) ) +transpose(step(X,12) ,7) ) +transpose(shuffle(transpose(X,-5) ) ,4) ) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ,-5) ) ,12) ) ,4) +transpose((transpose(transpose(transpose(transpose(transpose((transpose(X,4) +transpose((step(X,12) +transpose(X,7) ) ,12) ) ,4) ,4) ,-7) ,4) ,4) |transpose(((((arpeggio((arpeggio((X+X) ) +((X+(X+transpose(X,12) ) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,12) ) ) ) +arpeggio((((X+transpose(X,12) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,4) ,7) ) ) ) +(arpeggio(step(transpose(X,-5) ,12) ) +transpose(step((transpose(X,-5) +transpose(transpose(X,-5) ,12) ) ,12) ,12) ) ) +transpose(((transpose(arpeggio((X+transpose(transpose(X,-5) ,-5) ) ) ,-5) |((step(step(X,12) ,12) +(((X|X) +X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) |echo(transpose(transpose(X,-7) ,-7) ,4,6) ) ) +(arpeggio(transpose(X,-5) ) +transpose((transpose((transpose((X+transpose(X,7) ) ,4) |transpose(X,-5) ) ,-7) +transpose((echo((X+transpose(transpose(X,-5) ,7) ) ,4,6) +X) ,12) ) ,7) ) ) ,7) ) +transpose((transpose((transpose((transpose(step(X,12) ,-7) +transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,-5) ,12) ) ,-7) +transpose(transpose((transpose(X,4) |(arpeggio(transpose(X,4) ) +transpose(step(X,12) ,7) ) ) ,-5) ,12) ) ,4) |arpeggio(shuffle(transpose(arpeggio(X) ,-7) ) ) ) ,12) ) ,-7) ) ,4) ) +transpose((transpose(transpose(transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,7) ) |(step(arpeggio(X) ,12) +transpose(echo(X,4,6) ,12) ) ) ,-5) ,-5) ,4) ,-5) |(transpose(((shuffle(transpose(transpose(echo(X,4,6) ,4) ,-7) ) +((((shuffle((transpose(X,-7) |(X|X) ) ) +transpose((X+transpose(transpose(X,-5) ,12) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose((((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose(((X+X) +X) ,4) ) +transpose(arpeggio((X|X) ) ,7) ) |(transpose(X,4) +transpose(transpose(X,-7) ,12) ) ) ,7) ) +(transpose((transpose(transpose(X,-5) ,4) |transpose(X,-5) ) ,-7) +transpose(echo(arpeggio((X+transpose(X,12) ) ) ,4,6) ,7) ) ) ) |(transpose((arpeggio(echo((X+transpose(shuffle(X) ,12) ) ,4,6) ) +transpose(echo(transpose(X,-7) ,4,6) ,12) ) ,-7) |(echo(transpose(transpose(transpose(X,-7) ,-7) ,-5) ,4,6) +transpose(((echo(shuffle(X) ,4,6) +(transpose(step(X,12) ,-5) +((X|X) +X) ) ) +(X|X) ) ,7) ) ) ) ,4) +transpose(transpose(((echo((echo(shuffle(X) ,4,6) |arpeggio(X) ) ,4,6) +transpose((echo(X,4,6) |(arpeggio(arpeggio(X) ) |step((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ) ,7) ) |((arpeggio(((X|X) +X) ) +transpose(echo(X,4,6) ,-5) ) +echo(arpeggio(transpose(X,4) ) ,4,6) ) ) ,-7) ,7) ) ) ,7) ) +transpose(transpose(((shuffle(arpeggio(((shuffle((X+transpose(X,12) ) ) |step(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +(X+X) ) +transpose(arpeggio(transpose(X,4) ) ,7) ) ,4) ,12) ) +transpose(shuffle((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,-5) ) ) ) |transpose((((transpose(X,-5) |transpose(X,-5) ) +shuffle(step(X,12) ) ) +((((echo(transpose(X,4) ,4,6) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) +transpose(((X+transpose(X,12) ) |shuffle(X) ) ,12) ) +transpose(transpose((X+X) ,-5) ,4) ) +transpose(transpose(echo(transpose(X,-7) ,4,6) ,-5) ,7) ) ) ,4) ) |transpose(((echo(arpeggio(transpose((transpose(transpose(X,-7) ,4) +echo((X|X) ,4,6) ) ,-7) ) ,4,6) +transpose((transpose((((X+transpose(X,7) ) +X) |transpose((transpose((((X|X) +transpose((X+X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) +transpose((X|X) ,7) ) ,4) ) ,4) +transpose(transpose((transpose((transpose(echo(X,4,6) ,-5) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) ) ,-7) +((shuffle(X) +((X+transpose((X+X) ,7) ) +echo((X+X) ,4,6) ) ) +transpose(transpose((X|X) ,-7) ,-5) ) ) ,4) ,12) ) ,4) ) +transpose(echo(step((arpeggio(transpose((X+transpose(transpose(X,-7) ,7) ) ,-7) ) +transpose(transpose((X+X) ,-7) ,7) ) ,12) ,4,6) ,7) ) ,-7) ) ,-5) ,12) ) ) ,4) ) +transpose((((step(arpeggio((arpeggio((transpose(transpose(transpose(X,-5) ,4) ,-7) |shuffle(transpose((transpose(echo(X,4,6) ,4) +transpose((X|X) ,12) ) ,-7) ) ) ) +shuffle(transpose(transpose(X,-5) ,-7) ) ) ) ,12) +transpose(((transpose(shuffle((transpose(X,4) +X) ) ,-7) |arpeggio(transpose(transpose(echo(X,4,6) ,-7) ,-7) ) ) |(transpose(shuffle((((shuffle(X) +transpose((X+transpose(X,12) ) ,7) ) +transpose(((X|X) |(X+(X+transpose(X,7) ) ) ) ,4) ) +transpose(transpose(shuffle((X+transpose(X,12) ) ) ,-7) ,7) ) ) ,-7) +(transpose(echo((transpose((X|X) ,-5) +transpose(transpose(X,4) ,7) ) ,4,6) ,-7) |((transpose(X,-7) +transpose(arpeggio(step(X,12) ) ,7) ) |((transpose(X,4) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) ) ) ) ) ,12) ) +transpose(transpose(transpose(step(transpose((((((X+transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(shuffle((X+transpose(X,7) ) ) ,4) ) +transpose(echo(X,4,6) ,7) ) |(arpeggio(X) +X) ) ,-7) ,12) ,-5) ,-5) ,4) ) +transpose(step((shuffle((((shuffle((((transpose(X,-7) +transpose(((X+transpose(X,7) ) +transpose((X+X) ,12) ) ,7) ) +((X+X) |transpose(X,-7) ) ) +transpose(((X|X) +transpose(transpose(X,-5) ,12) ) ,7) ) ) |step(((((X+transpose((X+transpose(X,12) ) ,12) ) +transpose(echo(X,4,6) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) |((X+transpose(X,12) ) +transpose(transpose(X,4) ,12) ) ) ,12) ) |(((transpose((transpose(transpose(transpose(X,4) ,4) ,-5) +transpose((X+transpose(step(X,12) ,7) ) ,-5) ) ,-7) +transpose((((echo(X,4,6) +transpose(X,-5) ) +step(X,12) ) +transpose((echo(X,4,6) +transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,7) ) ,4) ) +transpose(transpose(transpose(arpeggio((X+X) ) ,-7) ,-5) ,7) ) |((shuffle(transpose(X,4) ) +transpose(((transpose(step(X,12) ,4) +transpose(transpose(transpose(X,4) ,-7) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |(X|((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose(transpose(X,-7) ,-7) ) ,12) ) ) ) +transpose(arpeggio(((echo(echo(X,4,6) ,4,6) +transpose((arpeggio(X) +(X+transpose(X,12) ) ) ,12) ) +transpose((X+(X|X) ) ,7) ) ) ,-5) ) ) +transpose((echo(shuffle((transpose(transpose(transpose(echo(X,4,6) ,-5) ,-5) ,-7) +transpose(((X+X) +transpose(echo(X,4,6) ,7) ) ,12) ) ) ,4,6) +transpose(step(transpose(transpose(transpose(step((transpose(X,-5) +transpose(X,12) ) ,12) ,-5) ,-5) ,4) ,12) ,12) ) ,12) ) ,12) ,7) ) ,7) ) +transpose(transpose(((echo(transpose(((((((((transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) |arpeggio((X+transpose(X,7) ) ) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(transpose(transpose(arpeggio(X) ,4) ,-5) ,4) ,4) ) +transpose(((shuffle(X) +transpose((transpose(X,-5) +transpose(step(X,12) ,7) ) ,12) ) |step((transpose(X,-5) +step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ) ,7) ) +transpose((((step(transpose(((transpose(X,-5) +transpose(X,7) ) +((X+transpose(X,12) ) +transpose(X,7) ) ) ,-7) ,12) +transpose(transpose(echo((X|X) ,4,6) ,4) ,4) ) +transpose(transpose(transpose(transpose(echo(X,4,6) ,-5) ,-5) ,-5) ,7) ) +transpose(step((transpose(step(X,12) ,-5) +transpose((X+transpose(transpose(X,4) ,12) ) ,12) ) ,12) ,12) ) ,7) ) +((transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) +transpose((step(transpose(X,-5) ,12) +transpose((((transpose(X,-5) |X) +transpose(arpeggio(X) ,4) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) ,-5) ) ,4) ) +transpose(transpose(transpose((X+(X+echo(X,4,6) ) ) ,4) ,4) ,7) ) ) +transpose(transpose(transpose(((transpose(shuffle(X) ,-5) |(X|transpose((X|X) ,4) ) ) |echo((transpose(X,-7) +transpose((X+transpose(X,12) ) ,7) ) ,4,6) ) ,-5) ,-7) ,7) ) |((echo(X,4,6) |step(((X+X) |X) ,12) ) +transpose(echo((transpose(((X+transpose(X,12) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) |(((((X+transpose(X,12) ) |X) +transpose((X+transpose(X,12) ) ,7) ) +((transpose(X,4) +transpose(transpose(transpose(X,4) ,4) ,4) ) +transpose(transpose(arpeggio(X) ,-7) ,7) ) ) +transpose((step(echo(X,4,6) ,12) +(arpeggio(X) +transpose(transpose(X,-7) ,12) ) ) ,12) ) ) ,4,6) ,12) ) ) ,-7) ,4,6) |(((((shuffle(transpose((((transpose(((transpose((transpose(X,-5) +transpose((transpose(X,-7) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,-5) +transpose((X|echo(X,4,6) ) ,4) ) +transpose((X+transpose(transpose((X|X) ,-5) ,7) ) ,7) ) ,-5) +transpose(transpose((transpose(X,-7) +transpose(transpose(X,-7) ,7) ) ,-5) ,4) ) +transpose((X+transpose(arpeggio(X) ,-5) ) ,7) ) |transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-7) ) ,4) ) |transpose(shuffle(transpose((transpose(step(transpose(shuffle(X) ,4) ,12) ,-7) +transpose(step(echo(arpeggio((arpeggio(X) +transpose((X+X) ,7) ) ) ,4,6) ,12) ,12) ) ,-5) ) ,-7) ) +transpose(arpeggio((transpose(transpose(transpose(transpose(transpose(X,-7) ,4) ,-5) ,-5) ,-7) +arpeggio(step((((transpose(transpose(transpose(X,-7) ,4) ,-7) +transpose(echo(transpose(transpose(X,4) ,-5) ,4,6) ,4) ) +transpose(X,7) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,-5) ) ,12) ) ) ) ,4) ) +transpose(transpose((transpose(((transpose(shuffle(X) ,-7) +transpose(shuffle((((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) +transpose((X+X) ,-7) ) ) ,7) ) +transpose(transpose(transpose((((shuffle(X) +transpose(X,4) ) +transpose(X,7) ) |transpose(X,-5) ) ,-5) ,-7) ,7) ) ,-5) |transpose(transpose(step(((transpose(step(X,12) ,-5) +transpose(((X+transpose(X,7) ) +transpose(transpose(X,4) ,12) ) ,12) ) |transpose(step(X,12) ,-5) ) ,12) ,-5) ,-7) ) ,-5) ,7) ) +(step(transpose(transpose((X+transpose(step(X,12) ,7) ) ,-5) ,-5) ,12) +((echo(echo(transpose((shuffle((X+X) ) +transpose(step(X,12) ,12) ) ,4) ,4,6) ,4,6) +transpose((transpose(transpose(((X+X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,-7) |(transpose((arpeggio(transpose((shuffle(((X+transpose(X,12) ) |X) ) |(X|arpeggio((X|X) ) ) ) ,-7) ) +transpose((step(step(echo(step(X,12) ,4,6) ,12) ,12) +transpose(transpose(transpose((X+transpose(X,7) ) ,-7) ,-7) ,7) ) ,12) ) ,-7) |((transpose((arpeggio((X|X) ) |transpose(arpeggio(X) ,-5) ) ,-5) +transpose((transpose(transpose(X,-7) ,4) +transpose(((arpeggio(X) +transpose((step(X,12) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose(arpeggio(transpose(X,-7) ) ,7) ) ,12) ) ,7) ) +transpose((arpeggio(shuffle(transpose(X,-5) ) ) +shuffle(transpose(step(X,12) ,-7) ) ) ,12) ) ) ) ,4) ) +transpose((((((X+X) |transpose(transpose(X,4) ,-7) ) |((X+transpose((X|X) ,4) ) +transpose(X,7) ) ) |step(((transpose(transpose(X,4) ,-7) +transpose((((X+transpose(X,7) ) +(X+X) ) +transpose(X,4) ) ,4) ) +transpose(arpeggio((X|X) ) ,7) ) ,12) ) +echo(arpeggio((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) ) ,4,6) ) ,7) ) ) ) |shuffle(((transpose(transpose((transpose(transpose(transpose(X,-5) ,-7) ,-5) +X) ,4) ,-7) +transpose(transpose((transpose((X|X) ,-7) |transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-7) ) ,-5) ,7) ) +(transpose(shuffle(transpose((X+transpose(transpose(X,4) ,12) ) ,-7) ) ,-5) +(shuffle((X+X) ) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ) ) ) ) ) +(transpose(step(((transpose((transpose(echo(transpose(arpeggio(((X+transpose(X,7) ) +transpose(X,12) ) ) ,-5) ,4,6) ,-5) +(step(transpose(X,-5) ,12) |(X+transpose(transpose(arpeggio(X) ,4) ,7) ) ) ) ,4) +transpose(((shuffle(((((X+transpose((X+X) ,4) ) +transpose(X,7) ) +(X|X) ) +(transpose((X+transpose(X,7) ) ,-7) |transpose(transpose(X,-7) ,-7) ) ) ) +transpose(transpose(transpose(step((((X+transpose(X,12) ) +transpose(X,7) ) |((X+transpose(X,7) ) +transpose(X,-5) ) ) ,12) ,-5) ,4) ,4) ) +transpose(transpose(transpose(((echo(step(shuffle(X) ,12) ,4,6) +transpose(X,4) ) +transpose(((echo(X,4,6) +arpeggio(transpose(X,-5) ) ) |(((X+(X+X) ) +transpose(step(transpose(X,-5) ,12) ,4) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) ) ,-7) ) ,4) ,-7) ,7) ) ,4) ) +transpose(((step((shuffle(transpose(X,4) ) +((X+(transpose(X,-7) +transpose(transpose(transpose(X,4) ,4) ,12) ) ) +shuffle(((((X+X) +transpose(X,7) ) +transpose(((X+X) |echo(X,4,6) ) ,12) ) +transpose(shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ,7) ) ) ) ) ,12) +transpose(transpose(arpeggio((((transpose(transpose(X,-5) ,4) +transpose(shuffle(echo(X,4,6) ) ,12) ) +transpose((((echo(X,4,6) |arpeggio(X) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4) ) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,4) ,4) ) +transpose(echo((((transpose(arpeggio(X) ,4) +transpose((shuffle(X) +transpose(transpose(X,-5) ,12) ) ,7) ) |((X|X) +X) ) +transpose((arpeggio((arpeggio(X) |X) ) +transpose((transpose((X+transpose(X,12) ) ,-7) |transpose(echo(transpose(X,4) ,4,6) ,-7) ) ,12) ) ,7) ) ,4,6) ,7) ) ,7) ) ,12) ,4) |transpose((arpeggio(echo((X+transpose((((X+transpose(X,7) ) +transpose(transpose(X,4) ,4) ) +transpose(shuffle(X) ,7) ) ,12) ) ,4,6) ) +(echo((transpose(step(X,12) ,4) +transpose((((X+transpose(X,12) ) +X) +transpose(transpose(X,-5) ,4) ) ,7) ) ,4,6) |((((((X+X) +transpose(X,7) ) +transpose((X+transpose(transpose(X,-7) ,12) ) ,7) ) +transpose(((shuffle(shuffle(transpose(X,4) ) ) +transpose(((transpose(transpose(X,-5) ,4) +transpose(transpose(X,-5) ,4) ) +transpose((X+transpose((X|X) ,7) ) ,7) ) ,4) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +X) ,7) ) ,4) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) +((((X+X) +transpose((X+transpose(X,12) ) ,12) ) +(transpose(echo(X,4,6) ,4) |step((X+X) ,12) ) ) |(X|((X+transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ) ) ) ) ) ,4) ) ) ,-7) ,12) ) random seed used was 62675186

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