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((((((shuffle((((transpose(transpose((((transpose(X,-5) |transpose(transpose(transpose(X,4) ,-7) ,-7) ) |(transpose(X,-7) |step(X,12) ) ) |transpose(transpose(transpose((step(X,12) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,-5) ,-5) ) ,-7) ,4) +transpose((arpeggio(transpose(transpose(((echo((X+transpose(X,12) ) ,4,6) +transpose(step((X+X) ,12) ,4) ) +transpose(shuffle((X+X) ) ,7) ) ,-5) ,4) ) +transpose((arpeggio(transpose(transpose(X,-7) ,-7) ) +transpose(echo(transpose((transpose(X,-5) +transpose((echo((X|X) ,4,6) +transpose(X,7) ) ,12) ) ,-5) ,4,6) ,-5) ) ,7) ) ,4) ) +transpose((echo(transpose(((transpose(X,-5) +transpose(((X+transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) ,4) ) +transpose((X+transpose(step(X,12) ,12) ) ,7) ) ,4) ,4,6) +step(transpose(transpose(((transpose((((transpose(X,-5) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(arpeggio(X) ,12) ) ,4) +transpose((transpose((X+transpose(X,-7) ) ,-7) |transpose(X,4) ) ,4) ) +transpose(transpose(echo(transpose(X,-5) ,4,6) ,-7) ,7) ) ,-7) ,-5) ,12) ) ,7) ) +echo((transpose(((arpeggio(X) +transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,-7) +transpose(transpose(transpose((X|X) ,4) ,-5) ,7) ) ,4,6) ) ) +transpose((((arpeggio(transpose((((((step(X,12) +transpose(transpose(X,-7) ,7) ) |(((X+transpose(transpose(X,4) ,12) ) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ) +transpose(transpose(transpose(arpeggio((X+X) ) ,4) ,-5) ,4) ) +transpose(transpose(shuffle((transpose(X,-5) +X) ) ,4) ,7) ) +transpose((shuffle((((echo(step(X,12) ,4,6) +transpose(arpeggio(transpose(X,-5) ) ,4) ) +transpose((X|X) ,7) ) +(((transpose(X,4) +transpose((X|X) ,4) ) +transpose((X+X) ,7) ) +transpose((arpeggio(X) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) ) ) +transpose(shuffle(shuffle(transpose(X,-5) ) ) ,7) ) ,12) ) ,-5) ) +transpose(step(transpose(transpose((((X+X) +transpose(echo((transpose(X,-5) +transpose(step(X,12) ,12) ) ,4,6) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ,-7) ,12) ,12) ) |((shuffle(transpose(step(step(((X+transpose((X|X) ,12) ) +transpose(arpeggio(X) ,7) ) ,12) ,12) ,-5) ) |(transpose((transpose((X+X) ,4) |(X+transpose(shuffle(X) ,-5) ) ) ,4) +transpose(step(arpeggio(transpose((transpose((X+X) ,-5) |transpose(X,-7) ) ,-7) ) ,12) ,7) ) ) +step(transpose((transpose(echo((transpose(X,4) +transpose(step(transpose(X,4) ,12) ,4) ) ,4,6) ,-7) +transpose(transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,-5) ,7) ) ,-7) ,12) ) ) |step((((transpose(shuffle((shuffle(step((X+X) ,12) ) |(X+arpeggio(echo(X,4,6) ) ) ) ) ,-5) +shuffle(transpose(((X+transpose(X,12) ) +transpose(transpose(transpose(X,-5) ,-5) ,12) ) ,-7) ) ) +transpose((transpose((step(X,12) +transpose(((X|X) +transpose(transpose(X,4) ,12) ) ,12) ) ,-7) +transpose((((transpose((X+transpose(X,12) ) ,-7) +(X+transpose(X,-7) ) ) +transpose(step(X,12) ,4) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose((transpose(X,-7) +(X|X) ) ,4) ) +transpose(((shuffle(X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,12) ) ,12) ) |echo(echo(shuffle(echo(transpose((X+transpose(X,12) ) ,-7) ,4,6) ) ,4,6) ,4,6) ) ,12) ) ,7) ) +transpose(transpose((((((transpose(transpose(transpose(((X+((X+transpose(X,4) ) +transpose(X,7) ) ) +(X|X) ) ,-7) ,-7) ,4) +transpose((echo(echo((X|X) ,4,6) ,4,6) +arpeggio(transpose(transpose(X,-5) ,-7) ) ) ,12) ) |(echo((((shuffle(X) +(shuffle((X+X) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose(transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,-7) ,4) ) +transpose(X,7) ) ,4,6) +(transpose(step(echo(X,4,6) ,12) ,-5) +transpose(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ,12) ) ) ) |transpose(echo(((((((arpeggio(X) +(X+X) ) +X) +transpose(((((X+X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,12) ) ,4) ) +transpose(transpose(shuffle(X) ,-5) ,7) ) +transpose(step(transpose(transpose(((X+transpose(X,12) ) |(X+transpose(X,12) ) ) ,-5) ,-7) ,12) ,4) ) +transpose(transpose(shuffle(transpose(X,4) ) ,-5) ,7) ) ,4,6) ,4) ) +transpose(transpose(shuffle(transpose((X+transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) ,-5) ) ,4) ,7) ) +transpose(transpose(arpeggio(((((shuffle(X) +step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) +transpose(transpose(X,4) ,12) ) |transpose((X+arpeggio(X) ) ,4) ) +transpose(shuffle(transpose(((X+transpose(X,12) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) ,12) ) ) ,-7) ,12) ) ,4) ,4) ) +transpose((((((echo((transpose(echo(((transpose(X,-5) +X) +step((shuffle(X) +transpose(X,12) ) ,12) ) ,4,6) ,-5) +transpose((shuffle((arpeggio((((arpeggio(X) |X) +transpose((((X|(X+transpose(X,7) ) ) +transpose(X,4) ) +transpose((X+transpose((X+X) ,12) ) ,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ) |(((X+transpose(X,4) ) +transpose(step(X,12) ,-7) ) +transpose(transpose((X+X) ,-7) ,7) ) ) ) +arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ) ,12) ) ,4,6) +transpose(transpose(echo(transpose(((transpose(transpose((((X|X) +transpose(transpose(X,4) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ,-5) +step((X+transpose(X,7) ) ,12) ) +transpose(transpose((transpose(transpose(transpose(X,-7) ,-7) ,-5) +(((((arpeggio(X) +X) +transpose(transpose(transpose(X,-7) ,-5) ,12) ) +transpose((echo(X,4,6) +X) ,4) ) +transpose(echo(((echo(X,4,6) +(X+X) ) |((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ) ,4,6) ,7) ) |(((echo(transpose(X,-5) ,4,6) +transpose((arpeggio(X) |arpeggio(X) ) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) |transpose(X,4) ) ) ) ,-7) ,12) ) ,-5) ,4,6) ,4) ,4) ) +transpose(transpose((((transpose((transpose(step(((X+transpose(X,12) ) +transpose(transpose(X,-7) ,12) ) ,12) ,4) +transpose((((transpose(step((X+X) ,12) ,-5) +transpose((X+transpose((X+transpose(X,7) ) ,-7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(X,4) ) ,12) ) ,4) |echo(step((echo(((X|X) +X) ,4,6) +transpose((arpeggio(X) +transpose((echo(X,4,6) |step(X,12) ) ,7) ) ,12) ) ,12) ,4,6) ) +transpose((transpose(transpose(((X+transpose((transpose(X,-7) +transpose((X|X) ,7) ) ,7) ) +echo(shuffle(X) ,4,6) ) ,4) ,-7) +transpose(step(step((transpose((((X+transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) |X) ,4) |(((transpose(X,-7) +transpose((X|X) ,12) ) +transpose(transpose(transpose(X,-7) ,4) ,4) ) +transpose(arpeggio((transpose(X,4) +transpose(X,-7) ) ) ,7) ) ) ,12) ,12) ,-7) ) ,4) ) +transpose(shuffle(arpeggio((transpose((transpose(arpeggio((((X|X) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ) ,4) +transpose(((X+X) |(X|X) ) ,4) ) ,-5) +transpose((((X+transpose(transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,7) ) +X) |echo((X+transpose(X,-5) ) ,4,6) ) ,-5) ,12) ) +transpose(((step((X+transpose(X,7) ) ,12) +transpose((X+transpose(X,12) ) ,7) ) |(((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) |(X+(X+transpose(X,12) ) ) ) +((((X+X) +transpose(X,4) ) +transpose(step(X,12) ,7) ) +((X|X) +(X+transpose(X,7) ) ) ) ) ) ,4) ) +transpose(((((transpose(X,-7) +((X+transpose(X,-7) ) +arpeggio(X) ) ) +transpose(((arpeggio(X) +transpose(transpose(transpose(X,-7) ,-5) ,12) ) +transpose(X,-7) ) ,4) ) +transpose(step(transpose(echo(transpose(X,-7) ,4,6) ,-5) ,12) ,7) ) |transpose(transpose(X,-7) ,-5) ) ,7) ) ,12) ) ) ) ,7) ) ,4) ,7) ) +transpose(arpeggio((shuffle(step(echo(step(transpose(((transpose(X,-7) +transpose(X,12) ) +transpose((((step(X,12) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(X,12) ) ,7) ) ,-5) ,12) ,4,6) ,12) ) +(((step(((transpose(transpose(X,-5) ,4) +transpose((X+transpose(X,4) ) ,4) ) +transpose(step(X,12) ,7) ) ,12) |((transpose(X,-5) +transpose(X,7) ) +transpose((transpose(transpose(X,-7) ,-7) |(X+transpose(X,12) ) ) ,12) ) ) +transpose(transpose(arpeggio((transpose(transpose(shuffle(X) ,-7) ,-5) +transpose(step(X,12) ,-5) ) ) ,-7) ,7) ) |(step((((((X+step(X,12) ) |(X+X) ) +transpose(((transpose(X,4) +transpose(((X+X) +(X|X) ) ,4) ) +transpose(X,7) ) ,7) ) +transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(arpeggio((step(X,12) |X) ) ,4) ) +transpose(((transpose(X,-5) +transpose(((transpose(X,-7) +transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose((echo(((X+X) +transpose((X+transpose(X,12) ) ,7) ) ,4,6) |((transpose(X,-5) +transpose(echo(X,4,6) ,7) ) +step(X,12) ) ) ,7) ) ,12) +transpose(echo(step(echo((transpose(X,-5) |(X+transpose(X,12) ) ) ,4,6) ,12) ,4,6) ,12) ) ) ) ) ,4) ) +transpose(transpose((step((((((((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) |transpose(X,-5) ) |(((transpose(X,4) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) |step(echo(X,4,6) ,12) ) ) +transpose(arpeggio(transpose(transpose(transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,-7) ,-7) ,-7) ) ,4) ) +transpose((step(((X|X) +transpose(X,7) ) ,12) +transpose(arpeggio((transpose(X,4) +transpose(step(X,12) ,12) ) ) ,12) ) ,7) ) |transpose(echo((transpose(((X+transpose(X,7) ) |echo(transpose(X,-7) ,4,6) ) ,4) |((transpose(X,-7) |(transpose(X,-7) +transpose((X+transpose(X,7) ) ,-5) ) ) |(transpose((X+transpose(X,12) ) ,-7) |X) ) ) ,4,6) ,-7) ) ,12) +transpose(transpose(transpose(transpose(((echo((X|X) ,4,6) +transpose((X+X) ,12) ) +transpose(transpose(arpeggio((transpose(X,-7) +transpose((X+transpose(X,12) ) ,7) ) ) ,-7) ,7) ) ,4) ,-5) ,-5) ,7) ) ,-5) ,7) ) +((((((shuffle(((((((X|transpose(X,4) ) |step((X+transpose(X,7) ) ,12) ) |((X|X) +transpose(transpose(transpose(X,4) ,4) ,7) ) ) +transpose((X+transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ,7) ) +transpose(((transpose(echo(X,4,6) ,-5) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,12) ) |((X+X) +transpose((echo((X+X) ,4,6) |X) ,12) ) ) ) +(shuffle(echo(transpose(transpose((X+transpose(X,12) ) ,-7) ,-7) ,4,6) ) +transpose(transpose(transpose((X+transpose(transpose(transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-7) ,-5) ,12) ) ,-7) ,-7) ,7) ) ) +transpose(transpose(transpose(transpose(transpose(transpose(X,4) ,4) ,-5) ,4) ,-5) ,4) ) +transpose(((((echo(transpose(X,-7) ,4,6) |transpose(((X|X) +(X|X) ) ,4) ) |step((transpose(X,-7) +transpose((X+X) ,7) ) ,12) ) +transpose((((((X+X) +transpose(arpeggio(X) ,12) ) |(echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) |step(((X+X) +X) ,12) ) +(shuffle((step(X,12) +transpose((X|X) ,12) ) ) +transpose(transpose((X|X) ,4) ,12) ) ) ,12) ) |shuffle(((((transpose(echo(X,4,6) ,-7) +(step((X+X) ,12) |((X+transpose(X,12) ) +(X+X) ) ) ) +transpose((X|(X|transpose(X,-7) ) ) ,4) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) +transpose(((X+X) +transpose(arpeggio(transpose(X,-7) ) ,-5) ) ,7) ) ) ) ,7) ) +transpose((((step(step(echo(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,4,6) ,12) ,12) |((((((arpeggio(X) +transpose(((X+X) +transpose(transpose(X,-7) ,12) ) ,4) ) +transpose(arpeggio(X) ,7) ) +((((X+X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,-5) ,7) ) |transpose((X|X) ,-7) ) ) +transpose(((transpose(X,-7) +transpose(transpose(X,-5) ,7) ) |transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,-5) ) ,4) ) +transpose(transpose(transpose(echo(X,4,6) ,-5) ,4) ,7) ) +transpose(transpose(arpeggio(echo((X|X) ,4,6) ) ,-7) ,7) ) ) +transpose(((((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose((X+X) ,4) ) +transpose(step(X,12) ,7) ) |transpose(transpose((X+X) ,-7) ,4) ) |((((transpose(transpose(X,-7) ,-5) |(((X+transpose((X+transpose(X,12) ) ,7) ) +transpose(echo(((X+transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,4,6) ,4) ) +transpose((((X|X) +X) +transpose((echo(X,4,6) +transpose((X|X) ,7) ) ,12) ) ,7) ) ) +transpose(transpose(arpeggio((((X+step(X,12) ) |step(X,12) ) +transpose(X,-7) ) ) ,-5) ,7) ) +transpose(((transpose(transpose(X,4) ,4) +(X+X) ) +(shuffle((arpeggio(X) +transpose(X,7) ) ) |((X+transpose(step(X,12) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ) ,-5) ) +transpose((arpeggio(arpeggio(transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,-5) ) ) |step(transpose((transpose(X,-7) |arpeggio(X) ) ,-5) ,12) ) ,7) ) ) ,4) ) +transpose((((echo(arpeggio(step(transpose(transpose(echo(X,4,6) ,4) ,4) ,12) ) ,4,6) +transpose(transpose((transpose(shuffle((transpose(X,4) |X) ) ,4) |((((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose((X+(X+X) ) ,4) ) +transpose((step(X,12) +transpose(shuffle(X) ,7) ) ,7) ) +transpose(arpeggio(X) ,4) ) +transpose(echo((transpose((X+X) ,4) +transpose((X|X) ,4) ) ,4,6) ,7) ) ) ,4) ,4) ) +transpose(((((transpose((((transpose(X,4) +transpose(transpose(X,-7) ,12) ) +transpose((transpose(X,4) |(X+transpose(X,7) ) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) +transpose((((X+transpose(X,12) ) +(X+transpose(X,7) ) ) +arpeggio(transpose(X,4) ) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(step(X,12) ,4) ,-5) ) +transpose(((transpose(echo((transpose(X,-5) |arpeggio(X) ) ,4,6) ,-5) |transpose((transpose(X,-5) +transpose(X,7) ) ,4) ) +transpose(((transpose(X,4) +transpose(((X|(X+transpose(X,7) ) ) |((transpose(X,-5) +transpose((X|X) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,4) ) +transpose((transpose(X,-5) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,12) ) ,7) ) ,7) ) ,-7) ) ,7) ) +transpose(echo(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(((X+X) +(X+transpose(X,12) ) ) ,4) ) +transpose((X|X) ,7) ) ,4,6) ,12) ) ,7) ) ,4) ) +transpose(((transpose((step((transpose(X,-7) |shuffle(step(X,12) ) ) ,12) +transpose((arpeggio(X) +transpose(((transpose(X,4) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,-7) +transpose(step((step(((((((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) +transpose(transpose(X,4) ,4) ) +transpose((X|X) ,7) ) +transpose(transpose(X,-7) ,12) ) ,12) +transpose(arpeggio(X) ,12) ) ,12) ,-7) ) +transpose(transpose(transpose(((shuffle(X) +transpose(((X|X) +X) ,-5) ) +transpose(transpose((transpose((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) |((transpose(X,-5) +transpose(shuffle(X) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ,-7) +transpose(((X+transpose(X,12) ) +transpose(transpose(X,-5) ,7) ) ,4) ) ,-5) ,-5) ) ,4) ,4) ,7) ) ,7) ) |((transpose((echo(transpose(shuffle(arpeggio(X) ) ,-7) ,4,6) +arpeggio(X) ) ,4) |echo(transpose(echo((transpose(echo(arpeggio(transpose((X+transpose(X,7) ) ,-7) ) ,4,6) ,-5) +arpeggio((step(X,12) +transpose(((X+transpose(X,12) ) |(X+X) ) ,12) ) ) ) ,4,6) ,4) ,4,6) ) |((((step((transpose(shuffle(X) ,-5) |transpose(((X|(X+transpose(X,7) ) ) +(X+echo(X,4,6) ) ) ,-7) ) ,12) +transpose(transpose((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) +transpose((X+transpose(((X|X) +transpose(X,12) ) ,12) ) ,12) ) ,-7) ,12) ) +transpose(((((X+transpose(step((X|X) ,12) ,4) ) +transpose((transpose(X,-5) +transpose(X,7) ) ,7) ) +shuffle((X|X) ) ) +transpose(arpeggio((X+echo(X,4,6) ) ) ,12) ) ,-7) ) +transpose(transpose(((shuffle(X) +transpose(transpose((X|X) ,-5) ,7) ) +transpose(transpose((transpose(X,4) +echo(arpeggio(X) ,4,6) ) ,-5) ,12) ) ,-7) ,4) ) +transpose((((transpose((X+X) ,4) +transpose(transpose((X+X) ,4) ,7) ) +transpose((transpose((X|X) ,-7) +transpose((shuffle((X+X) ) +transpose(echo((X|X) ,4,6) ,12) ) ,7) ) ,7) ) +transpose(((transpose((transpose((arpeggio((X|X) ) |transpose(arpeggio(X) ,-5) ) ,-7) +transpose(X,7) ) ,4) |transpose(step(((((X+transpose(transpose(X,-5) ,12) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) ) +transpose(((X+X) +transpose(X,4) ) ,7) ) +transpose(((X+transpose(X,7) ) +transpose((X+X) ,7) ) ,7) ) ,12) ,4) ) +(echo(transpose((X|transpose(X,-5) ) ,-5) ,4,6) +transpose(transpose(((((transpose(X,-5) +((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ) +transpose(echo(X,4,6) ,7) ) +transpose((transpose(echo(echo(X,4,6) ,4,6) ,4) +echo(step((X+X) ,12) ,4,6) ) ,4) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) ,4) ,7) ) ) ,12) ) ,7) ) ) ) ) ,7) ) +arpeggio((transpose(echo(transpose(transpose(((X+transpose((arpeggio(X) +X) ,4) ) |echo(X,4,6) ) ,-5) ,-7) ,4,6) ,-7) +transpose(transpose((shuffle(step(transpose((transpose(X,-5) |(X+transpose(X,12) ) ) ,4) ,12) ) +echo(transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,-5) ,4,6) ) ,-5) ,7) ) ) ) |shuffle(((transpose(transpose(((transpose(X,-5) +transpose(transpose(transpose(shuffle(X) ,-7) ,-5) ,4) ) +transpose((transpose(X,4) +transpose(step(X,12) ,12) ) ,7) ) ,-7) ,-7) +transpose(transpose(transpose(transpose(transpose(X,-7) ,-5) ,-5) ,-7) ,12) ) +transpose(step((transpose(transpose(echo(step(X,12) ,4,6) ,-5) ,-7) |(transpose((X+transpose((transpose(X,4) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,-5) +transpose(transpose(X,-7) ,7) ) ) ,12) ,12) ) ) ) ,4) random seed used was 228153247

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