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: echo((((((step(((((((transpose(step(transpose(echo(X,4,6) ,4) ,12) ,-5) +transpose(echo(arpeggio(arpeggio(transpose(X,-5) ) ) ,4,6) ,4) ) +transpose(transpose(step(((X+(X+transpose(X,12) ) ) +transpose((echo(X,4,6) |(X|X) ) ,12) ) ,12) ,-5) ,7) ) +transpose(transpose(echo((arpeggio((((X|X) +transpose(X,12) ) +((X+transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ) |step(step(transpose((((step(echo(X,4,6) ,12) +transpose(X,12) ) +transpose(X,4) ) +transpose(((X+transpose(X,12) ) +transpose(step(X,12) ,7) ) ,7) ) ,4) ,12) ,12) ) ,4,6) ,-7) ,4) ) +transpose((((shuffle(((transpose(X,4) +transpose(step(X,12) ,12) ) +echo(X,4,6) ) ) +echo(transpose(transpose((echo(echo(X,4,6) ,4,6) +(((X+transpose(X,4) ) +transpose(X,7) ) +step(X,12) ) ) ,4) ,-5) ,4,6) ) +transpose(step(arpeggio(((arpeggio(step(X,12) ) +transpose(((X+transpose(X,7) ) +transpose(arpeggio(arpeggio(X) ) ,12) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,12) ,7) ) +(((transpose(arpeggio(shuffle(X) ) ,4) +shuffle(((transpose(X,4) +transpose((shuffle(X) |X) ,4) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) ) ) +transpose(step(transpose(transpose(X,-5) ,4) ,12) ,7) ) +transpose(((shuffle(shuffle(arpeggio(X) ) ) +arpeggio(shuffle((X+transpose(X,12) ) ) ) ) +transpose(((((shuffle(X) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +transpose(((transpose(step(transpose(X,4) ,12) ,-7) +transpose(((X+transpose(echo(X,4,6) ,7) ) +transpose(((X|X) +transpose(transpose(X,-7) ,7) ) ,7) ) ,12) ) +transpose(echo((X+transpose(step(X,12) ,7) ) ,4,6) ,7) ) ,4) ) +transpose(echo(echo((X+X) ,4,6) ,4,6) ,7) ) ,7) ) ,7) ) ) ,7) ) +transpose(step((echo(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose((arpeggio(X) +transpose(X,7) ) ,7) ) ,-7) ,4,6) +transpose(((arpeggio((step(arpeggio(X) ,12) |arpeggio(step((transpose(X,-5) +transpose(transpose(X,-5) ,7) ) ,12) ) ) ) +transpose(echo(((((((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose((echo(X,4,6) +transpose((X+transpose(X,12) ) ,12) ) ,7) ) +transpose(X,12) ) |arpeggio(arpeggio(step(X,12) ) ) ) ,4,6) ,7) ) +transpose(transpose(echo(step(transpose(shuffle(step(X,12) ) ,-5) ,12) ,4,6) ,-5) ,12) ) ,7) ) ,12) ,4) ) +transpose(arpeggio((transpose(((((arpeggio(transpose(X,-5) ) +transpose(X,7) ) |(X+transpose(((X+transpose(X,12) ) +transpose(echo(X,4,6) ,12) ) ,7) ) ) +transpose(((transpose((X|X) ,-5) +transpose(echo(transpose(X,-7) ,4,6) ,4) ) +transpose(transpose(step(X,12) ,4) ,7) ) ,12) ) +transpose(arpeggio(transpose(echo((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4,6) ,4) ) ,-7) ) ,4) |(shuffle(transpose((((transpose(((X+transpose(X,12) ) |X) ,4) +transpose(transpose((X+transpose(step(X,12) ,12) ) ,-5) ,4) ) +transpose(step(step(echo(X,4,6) ,12) ,12) ,7) ) +transpose(((X+transpose((X+transpose(X,7) ) ,12) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) ,-7) ) ,12) ) ,-5) ) +transpose(shuffle(echo(((transpose(shuffle(((transpose(X,-5) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,-5) +transpose(step((transpose(((X+transpose(X,12) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) +transpose((transpose(X,4) +transpose(transpose(step(X,12) ,-5) ,12) ) ,7) ) ,12) ,4) ) +transpose(echo(((step((X|X) ,12) +transpose(((X+transpose(X,12) ) +transpose(transpose(X,-5) ,12) ) ,4) ) +transpose(echo(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4,6) ,7) ) ,4,6) ,7) ) ,4,6) ) ,12) ) ) ) ,7) ) ,12) +transpose((transpose(transpose(((transpose(transpose(X,-5) ,4) +transpose((echo(arpeggio((X+transpose(X,12) ) ) ,4,6) |echo(transpose(X,-5) ,4,6) ) ,12) ) +((step(((shuffle(X) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) +transpose((transpose(arpeggio(shuffle(arpeggio(X) ) ) ,-5) +transpose(arpeggio(transpose(X,-7) ) ,12) ) ,7) ) +echo((((shuffle(X) +(X+transpose(X,12) ) ) +transpose(shuffle(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,4) ) +transpose(echo(arpeggio(X) ,4,6) ,7) ) ,4,6) ) ) ,-7) ,-5) +transpose(echo((transpose(((echo(((step(X,12) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,4,6) +transpose((X+transpose(X,7) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ,7) ) ,4) +transpose((echo(step(transpose(transpose((X+transpose(X,12) ) ,4) ,-5) ,12) ,4,6) +transpose(((((arpeggio(transpose((transpose((shuffle(X) +echo(X,4,6) ) ,4) |echo(transpose(X,-7) ,4,6) ) ,4) ) +transpose(step(arpeggio(echo((((shuffle(X) +(X+transpose(X,12) ) ) +transpose(transpose(X,-5) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4,6) ) ,12) ,4) ) +transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,7) ) +transpose(((((X+X) +(echo(arpeggio(X) ,4,6) +transpose((X+transpose(X,12) ) ,12) ) ) +transpose(shuffle(shuffle(echo(X,4,6) ) ) ,7) ) +((shuffle(echo(echo(X,4,6) ,4,6) ) +transpose(arpeggio((((transpose(step(X,12) ,-5) +transpose(((transpose(X,4) +transpose((X+transpose(X,12) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,12) ) +transpose(((X+X) +(X+transpose(X,7) ) ) ,4) ) +transpose(((transpose(X,-7) +transpose(X,7) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) ,7) ) ) ,4) ) +transpose(step(arpeggio(echo((echo((X|X) ,4,6) +transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4,6) ) ,12) ,7) ) ) ,4) ) +transpose((echo(echo((X+transpose(((X+transpose(echo((X+transpose(X,7) ) ,4,6) ,4) ) +transpose(step(X,12) ,7) ) ,12) ) ,4,6) ,4,6) |step((((step(((X+X) |X) ,12) +transpose((arpeggio(step(X,12) ) +transpose(echo(((X+transpose((X|X) ,4) ) +transpose(X,7) ) ,4,6) ,12) ) ,4) ) +transpose(shuffle((X+transpose((X+transpose(X,12) ) ,7) ) ) ,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) ) ,12) ) ,7) ) ,12) ) ,12) ) ,4,6) ,7) ) ,4) ) +transpose((((echo(step((arpeggio((transpose(echo(transpose((X+transpose(X,7) ) ,-7) ,4,6) ,4) |(arpeggio(X) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) ) ) +(transpose(transpose(step(X,12) ,-7) ,4) |echo((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-7) ) ,-7) +transpose(shuffle(X) ,7) ) ,4,6) ) ) ,12) ,4,6) |transpose((transpose(((transpose((echo(X,4,6) +transpose(shuffle(transpose(X,4) ) ,7) ) ,-7) +transpose(transpose(echo((X+X) ,4,6) ,-5) ,4) ) +transpose(transpose(shuffle((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,-5) ,7) ) ,-5) +(((arpeggio(((transpose(X,4) +transpose(X,12) ) +transpose((shuffle(echo(X,4,6) ) +transpose(((transpose(X,-7) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ) +transpose((arpeggio((((X+X) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) ) +transpose((echo(transpose(X,-7) ,4,6) +transpose((X+transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,7) ) ,7) ) ,12) ) ,7) ) +transpose(echo(transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,7) ) ,4) ,4) ,4,6) ,4) ) +transpose(step(((echo(X,4,6) +transpose(echo(arpeggio((X|X) ) ,4,6) ,4) ) +transpose((echo(step(X,12) ,4,6) +transpose(step(transpose(X,-5) ,12) ,7) ) ,7) ) ,12) ,7) ) ) ,-5) ) +transpose(step(arpeggio(arpeggio(shuffle(transpose(((((shuffle(X) +transpose(X,12) ) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) +transpose(transpose(X,-7) ,7) ) +(transpose(arpeggio(X) ,-7) +((X+transpose((X+X) ,7) ) +transpose(X,12) ) ) ) ,-5) ) ) ) ,12) ,4) ) +transpose(((step(((step(shuffle(transpose(step(step(X,12) ,12) ,-5) ) ,12) +transpose(step(echo(step(X,12) ,4,6) ,12) ,4) ) +transpose((transpose(shuffle(((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,-7) +transpose((shuffle(X) +transpose(arpeggio(X) ,7) ) ,12) ) ,7) ) ,12) +transpose((arpeggio((shuffle(transpose(transpose(step(X,12) ,-7) ,-7) ) +transpose((transpose(echo(step((X+X) ,12) ,4,6) ,-5) +transpose(arpeggio(((step(((X+transpose(X,7) ) |step(X,12) ) ,12) +transpose(shuffle(shuffle((X|X) ) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(transpose(shuffle(X) ,-5) ,7) ) +((X+transpose(X,12) ) +transpose(X,12) ) ) ,7) ) ) ,12) ) ,12) ) ) +transpose(((transpose(arpeggio(transpose(((X+transpose(X,12) ) +X) ,-7) ) ,4) +transpose(shuffle((((X+echo(X,4,6) ) +transpose(((step((X+transpose(X,12) ) ,12) +transpose(step((((X+transpose(X,12) ) +transpose(X,4) ) +step(X,12) ) ,12) ,4) ) +transpose((echo(X,4,6) +transpose(echo((step(X,12) +transpose(X,12) ) ,4,6) ,7) ) ,7) ) ,4) ) +transpose(step(((X+(step(X,12) |X) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) ) ,12) ,7) ) ) ,4) ) +transpose(shuffle(echo(step(transpose((shuffle(X) +transpose(transpose(transpose(X,-5) ,-5) ,12) ) ,-7) ,12) ,4,6) ) ,7) ) ,12) ) ,4) ) +transpose(transpose(step(((((transpose(X,4) +transpose(shuffle(X) ,4) ) +transpose((transpose(X,4) +transpose(X,12) ) ,7) ) +transpose(X,12) ) +transpose((((X+transpose(echo(X,4,6) ,4) ) +transpose(((X+transpose((X|(X+transpose(X,12) ) ) ,4) ) +transpose(((X|X) +transpose(shuffle(X) ,7) ) ,7) ) ,7) ) |(transpose((X|X) ,4) +transpose(X,7) ) ) ,12) ) ,12) ,-5) ,7) ) ,7) ) ,7) ) +arpeggio(step((((arpeggio(arpeggio((transpose(X,4) +transpose(arpeggio(transpose(X,-7) ) ,12) ) ) ) +((transpose(arpeggio(((echo(X,4,6) +transpose(((X+transpose(X,12) ) |X) ,7) ) |arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ,-5) +transpose(transpose(arpeggio(((echo(transpose(X,-5) ,4,6) +transpose((shuffle(transpose(X,4) ) |(((X+X) +transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) ) ,4) ) +transpose(shuffle((arpeggio(X) +transpose(X,7) ) ) ,7) ) ) ,4) ,4) ) +transpose(transpose(echo(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(shuffle(step(X,12) ) ) ,4) ) +transpose((step(arpeggio(X) ,12) +transpose(transpose(X,4) ,7) ) ,7) ) ,4,6) ,4) ,7) ) ) +transpose(shuffle(step(arpeggio(((shuffle((echo(X,4,6) +transpose(transpose(step(arpeggio(X) ,12) ,4) ,12) ) ) +transpose(transpose((((echo(X,4,6) +echo(X,4,6) ) |arpeggio(X) ) +transpose(echo(X,4,6) ,7) ) ,-7) ,4) ) +transpose(transpose(echo(shuffle(transpose(X,4) ) ,4,6) ,4) ,7) ) ) ,12) ) ,4) ) +transpose(((((step(echo((step(X,12) |transpose((arpeggio(X) +transpose((X+X) ,7) ) ,4) ) ,4,6) ,12) +transpose(transpose(echo(((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) +transpose(((X+transpose(X,7) ) +transpose(transpose(X,4) ,12) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) ,4) ,7) ) |arpeggio(echo(step(echo(transpose(arpeggio(X) ,-5) ,4,6) ,12) ,4,6) ) ) +transpose(step(shuffle(((echo(arpeggio((step(X,12) +transpose(((shuffle(X) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,12) ) ) ,4,6) |echo(((transpose(arpeggio(X) ,-7) +transpose((X+echo(X,4,6) ) ,7) ) +((shuffle(shuffle(X) ) +transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,4) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) ) ,4,6) ) +transpose(step((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose((shuffle(transpose(X,4) ) +transpose(X,12) ) ,12) ) ,12) ,12) ) ) ,12) ,4) ) +transpose(((((((((X+transpose(X,7) ) +transpose((shuffle(transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose((shuffle((shuffle(X) |transpose(X,-7) ) ) +(X+X) ) ,12) ) |(((((X+X) +transpose(step(echo(X,4,6) ,12) ,7) ) |arpeggio((X|X) ) ) +transpose((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(((transpose(X,4) +transpose(shuffle(X) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) ,4) ) +transpose(arpeggio((((arpeggio(X) +transpose(X,4) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) +transpose(X,7) ) ) ,7) ) ) +transpose((arpeggio(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) |transpose((arpeggio(X) +transpose(echo(X,4,6) ,7) ) ,4) ) ,4) ) +transpose(transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(step(echo(X,4,6) ,12) ,7) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,12) ) ,-5) ,7) ) +((transpose((X|X) ,4) |(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(echo(((X+transpose(shuffle(X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4,6) ,12) ) ) +transpose(echo(transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ,4,6) ,12) ) ) +transpose((transpose(transpose(shuffle(transpose(X,4) ) ,-5) ,-5) |((((transpose(X,-5) |transpose(X,-7) ) +transpose((shuffle((((X+transpose(X,12) ) +transpose(transpose(shuffle((X+transpose(X,7) ) ) ,-5) ,4) ) +transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) ) ,7) ) ) +transpose((((shuffle((X+X) ) +transpose(((X+transpose(step(X,12) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) +transpose(arpeggio((((X+X) +transpose(step(X,12) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,4) ) +transpose((shuffle(transpose(X,-7) ) +transpose(arpeggio(X) ,7) ) ,7) ) ,7) ) ,12) ) +transpose(((transpose(step((transpose(((X+transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ,-7) +transpose(transpose(X,-5) ,12) ) ,12) ,4) +transpose(shuffle(transpose((echo(X,4,6) +X) ,4) ) ,4) ) +transpose((arpeggio(X) +transpose(((arpeggio(X) +transpose(X,7) ) +transpose(step(X,12) ,7) ) ,7) ) ,7) ) ,4) ) +transpose(echo(((shuffle((arpeggio(X) +transpose(X,7) ) ) +transpose(((transpose(transpose(X,-7) ,-7) +transpose((transpose(X,4) +transpose(((X+transpose(X,7) ) +(X|X) ) ,12) ) ,12) ) +transpose(step((step(X,12) +transpose(X,7) ) ,12) ,12) ) ,4) ) +transpose(((echo((X+transpose(X,7) ) ,4,6) +transpose(step(arpeggio(X) ,12) ,12) ) +transpose((X+transpose((X|X) ,12) ) ,-5) ) ,7) ) ,4,6) ,7) ) ) ,12) ) ,7) ) ,7) ) ,12) ) ) +transpose((step(echo(shuffle(shuffle(arpeggio(echo((shuffle(X) |transpose(echo(X,4,6) ,-5) ) ,4,6) ) ) ) ,4,6) ,12) |((step((echo(step(step(arpeggio(X) ,12) ,12) ,4,6) +transpose((X+transpose(X,12) ) ,12) ) ,12) +transpose(echo((transpose(shuffle(((transpose(X,-5) +step((arpeggio(shuffle(X) ) +transpose((shuffle(X) +transpose(transpose(X,4) ,7) ) ,7) ) ,12) ) |((echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4,6) +transpose((X|X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ) ,-7) +transpose(step((echo((((echo(step(X,12) ,4,6) +transpose(((X|X) +X) ,7) ) |transpose(transpose(X,-7) ,4) ) +transpose(((((X|X) +transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,12) ) ,7) ) ,4,6) |(shuffle(transpose(X,-5) ) +((step(X,12) +transpose(X,12) ) +transpose(transpose((((X+transpose(X,12) ) +transpose(transpose(X,4) ,12) ) +transpose(arpeggio(X) ,7) ) ,4) ,12) ) ) ) ,12) ,7) ) ,4,6) ,7) ) +transpose((((((echo((X+transpose(X,12) ) ,4,6) +transpose(X,4) ) +transpose(arpeggio(step(X,12) ) ,7) ) +((echo(transpose(X,-5) ,4,6) |transpose(X,-5) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +shuffle(X) ) ,-5) ) ) +(arpeggio(((((X+transpose(X,12) ) +transpose(X,7) ) |transpose(X,4) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,12) ) ) +transpose(echo(echo(transpose((shuffle(X) |arpeggio(X) ) ,-7) ,4,6) ,4,6) ,7) ) ) +transpose((transpose(transpose(arpeggio(shuffle((X+transpose(X,7) ) ) ) ,-5) ,-7) +transpose(((transpose((step(shuffle(shuffle(X) ) ,12) |arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-5) +transpose((shuffle(X) |transpose((((echo(X,4,6) +transpose(X,-5) ) |((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) ) +transpose((step(X,12) +transpose((step(X,12) +transpose(X,7) ) ,7) ) ,12) ) ,-5) ) ,12) ) |(step((arpeggio(X) |X) ,12) +transpose(transpose((((shuffle(transpose(X,-7) ) +transpose(shuffle(X) ,7) ) +transpose(((X+transpose(X,12) ) +transpose(X,-7) ) ,4) ) +transpose(transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,7) ) ,-5) ,7) ) ) ,12) ) ,-5) ) ,12) ) ) ,7) ) |transpose(step(((((echo((shuffle(transpose(arpeggio(arpeggio((shuffle((X+transpose(X,12) ) ) +transpose(transpose((X|step(X,12) ) ,4) ,7) ) ) ) ,-5) ) +transpose(transpose(((((step(((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) +transpose((((X+X) +transpose(step(X,12) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((((transpose(X,-7) +step(X,12) ) +transpose((transpose(X,-5) +transpose(X,12) ) ,4) ) +transpose((transpose(X,-5) +transpose(X,7) ) ,7) ) ,4) ) +transpose(shuffle((X+transpose((X|X) ,7) ) ) ,7) ) ,-5) ,12) ) ,4,6) +transpose((((((arpeggio(X) +transpose(X,7) ) |((shuffle(X) +transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ) +transpose(step(X,12) ,7) ) ) |((transpose(X,4) +transpose(X,4) ) +transpose(echo((((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4,6) ,7) ) ) +(step(transpose((echo(X,4,6) +transpose((X+transpose(X,7) ) ,7) ) ,-5) ,12) +transpose(shuffle(echo(echo(shuffle(shuffle(X) ) ,4,6) ,4,6) ) ,12) ) ) +transpose((((transpose(echo(X,4,6) ,-5) |shuffle(X) ) +transpose(transpose(arpeggio(X) ,4) ,12) ) +((transpose((step(X,12) +transpose(X,12) ) ,4) +(X+transpose((X+transpose(X,12) ) ,12) ) ) |(transpose(arpeggio(X) ,4) +transpose(((((X+transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) +transpose((step(echo(X,4,6) ,12) +transpose((shuffle(X) +transpose(X,12) ) ,7) ) ,7) ) +transpose((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) +((((X+transpose(X,7) ) +transpose(shuffle(X) ,12) ) +transpose(transpose(X,4) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ,7) ) ,12) ) ) ) ,-5) ) ,4) ) +transpose(shuffle(shuffle((shuffle(((X+transpose(X,12) ) +transpose(step(step(X,12) ,12) ,12) ) ) +echo((X+transpose(X,12) ) ,4,6) ) ) ) ,7) ) +transpose(arpeggio((step(shuffle(arpeggio(step(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,12) ) ) ,12) +transpose(shuffle((((((step((X+transpose(X,7) ) ,12) +transpose(echo(X,4,6) ,12) ) |shuffle(transpose(X,-5) ) ) +transpose((((X+X) +transpose((X+transpose(arpeggio(X) ,12) ) ,12) ) +transpose((step(arpeggio(X) ,12) +transpose((X+(X+transpose(X,7) ) ) ,7) ) ,12) ) ,7) ) +transpose(echo(echo(transpose((X+transpose(X,12) ) ,4) ,4,6) ,4,6) ,7) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((((X+transpose(X,12) ) |X) +transpose(((X+transpose(X,7) ) +transpose((X+X) ,7) ) ,7) ) ,12) ) +transpose(transpose((X+transpose(((X+transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,7) ) ,-7) ,7) ) +step((shuffle(arpeggio((X+transpose(X,7) ) ) ) +transpose((X+shuffle(transpose(X,4) ) ) ,12) ) ,12) ) ,7) ) ) ,7) ) ) ,4) ) +transpose((echo(transpose(transpose((shuffle(transpose((echo(X,4,6) +transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ,7) ) ,-7) ) +transpose((((((step(X,12) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ) +transpose(((X+transpose(X,7) ) +(transpose(transpose(X,-7) ,-7) +(X|X) ) ) ,7) ) ,7) ) ,-5) ,-5) ,4,6) +transpose((shuffle(arpeggio((transpose(transpose(arpeggio(X) ,-7) ,4) +transpose(echo(((X+transpose(step(X,12) ,7) ) +transpose((transpose(X,-7) +transpose(((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,4,6) ,7) ) ) ) +transpose((transpose((((step(((X|X) +transpose(X,7) ) ,12) +transpose((arpeggio(X) |(arpeggio(X) |X) ) ,7) ) +transpose((echo(X,4,6) +transpose(echo(transpose((X|X) ,-7) ,4,6) ,12) ) ,4) ) +transpose(((((step(X,12) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) |(X|X) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) ) ,7) ) ,7) ) ,-5) +transpose(((shuffle(shuffle(echo(((((X|X) +transpose((X|X) ,12) ) +transpose((X+X) ,4) ) +transpose((transpose(X,4) |X) ,7) ) ,4,6) ) ) +transpose(transpose((transpose((X|X) ,4) |(X+transpose(transpose((X+transpose(X,12) ) ,-7) ,-5) ) ) ,4) ,4) ) +transpose(echo(transpose((X+transpose((X+X) ,12) ) ,4) ,4,6) ,7) ) ,7) ) ,7) ) ,12) ) ,7) ) ,12) ,4) ) ,4,6) random seed used was 230480630

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