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(((((((((transpose(step(echo(arpeggio(X) ,4,6) ,12) ,-7) +transpose(((step(step(X,12) ,12) +transpose((arpeggio(arpeggio(X) ) +(shuffle(shuffle((X+X) ) ) +transpose(((X+X) +transpose(transpose(X,4) ,7) ) ,12) ) ) ,7) ) +transpose(echo(step(transpose(shuffle(arpeggio(arpeggio(transpose(X,4) ) ) ) ,-7) ,12) ,4,6) ,12) ) ,7) ) +transpose(echo(transpose((((X+transpose(X,4) ) +transpose(shuffle(X) ,7) ) +transpose(X,7) ) ,4) ,4,6) ,4) ) +transpose(transpose(transpose(transpose(transpose(((X+transpose(arpeggio(X) ,7) ) +transpose((transpose(X,-7) +transpose(step((X|X) ,12) ,12) ) ,7) ) ,4) ,4) ,-7) ,-7) ,7) ) |(transpose(echo(((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(((((shuffle(step(X,12) ) +transpose(echo(echo((X+transpose((X+X) ,12) ) ,4,6) ,4,6) ,7) ) +transpose(((arpeggio((X+transpose(transpose(X,-5) ,12) ) ) +transpose(transpose(step(transpose(X,-7) ,12) ,-7) ,4) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) ,4) ) +transpose(transpose(shuffle(X) ,-5) ,7) ) |echo(step(((X+transpose(X,12) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,12) ) ,12) ,4,6) ) ,12) ) ,4,6) ,-5) +transpose(((arpeggio((((echo(X,4,6) +transpose(X,4) ) +transpose(X,7) ) +echo(transpose((((echo((((X|X) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,4,6) +transpose((X+transpose(transpose(X,4) ,12) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) |shuffle(step(transpose(X,4) ,12) ) ) ,-7) ,4,6) ) ) +transpose(echo(transpose(arpeggio(((echo((X+transpose((echo(X,4,6) +arpeggio((X+transpose(X,12) ) ) ) ,12) ) ,4,6) +transpose(transpose((X|X) ,4) ,4) ) +transpose(shuffle(arpeggio((X+transpose(echo(X,4,6) ,12) ) ) ) ,7) ) ) ,-5) ,4,6) ,12) ) +transpose(shuffle(((X+X) +transpose((arpeggio((X|transpose(X,-7) ) ) +transpose(transpose(echo((X+X) ,4,6) ,-7) ,7) ) ,-5) ) ) ,7) ) ,7) ) ) +transpose(((((step(shuffle(((shuffle(((echo(X,4,6) +transpose((((X+(X+transpose(X,7) ) ) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose((X+transpose(((X+transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) ,12) ) ,7) ) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,12) ) +echo(echo(echo(X,4,6) ,4,6) ,4,6) ) +transpose(((arpeggio(X) +transpose(transpose(X,-5) ,7) ) +transpose(X,12) ) ,7) ) ,4) ) +transpose((step(transpose(transpose(X,-5) ,-5) ,12) +transpose(step(transpose((X+transpose(X,7) ) ,-7) ,12) ,12) ) ,7) ) ) ,12) +transpose(arpeggio(transpose(transpose(transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ,-5) ,4) ) ,7) ) +transpose(step(((step(transpose(shuffle((X+X) ) ,-7) ,12) +transpose(transpose(((((X+transpose(X,12) ) +transpose(echo(arpeggio(X) ,4,6) ,12) ) +transpose(echo(shuffle(arpeggio(X) ) ,4,6) ,4) ) +transpose(((X+transpose(X,12) ) +transpose((((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,12) ) ,7) ) ,-7) ,4) ) +transpose(shuffle(((transpose(((X|X) +transpose((X|X) ,7) ) ,-7) +transpose(transpose(echo(shuffle(X) ,4,6) ,-5) ,4) ) +transpose((transpose(X,-5) +transpose(arpeggio(X) ,7) ) ,7) ) ) ,7) ) ,12) ,4) ) +transpose((((transpose(X,-5) +transpose((shuffle((X+transpose(X,12) ) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) +echo(arpeggio(transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,12) ) ,-7) ) ,4,6) ) |(transpose((shuffle(shuffle(((X+transpose(X,12) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) +transpose(((arpeggio(((X+transpose(X,12) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) |(X+transpose(X,12) ) ) |transpose(echo(arpeggio(X) ,4,6) ,-5) ) ,7) ) ,4) +shuffle(transpose(((step((((((X+transpose(X,4) ) +transpose(X,7) ) |(X+X) ) +transpose(transpose(step(X,12) ,-7) ,7) ) +transpose(shuffle(((X+X) +transpose(X,4) ) ) ,12) ) ,12) +transpose(shuffle(((X+transpose(X,4) ) +transpose((((X+transpose(X,7) ) +transpose(arpeggio((X+X) ) ,4) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ,7) ) ) ,4) ) +transpose(((echo(X,4,6) +transpose(echo(arpeggio(X) ,4,6) ,12) ) +transpose(arpeggio(shuffle((X|X) ) ) ,7) ) ,7) ) ,-5) ) ) ) ,7) ) +transpose(((((transpose((X+X) ,-5) +transpose(step(((X+transpose(X,7) ) +(X+transpose(X,12) ) ) ,12) ,4) ) +transpose(transpose(step((transpose(shuffle(X) ,-5) +transpose((X+transpose(X,7) ) ,12) ) ,12) ,-5) ,7) ) |(((X+transpose(transpose(X,-5) ,7) ) |((echo(X,4,6) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) |(X|(X+transpose(echo(X,4,6) ,12) ) ) ) ) |(transpose(transpose(arpeggio(arpeggio(echo((transpose(X,-5) +transpose(X,-5) ) ,4,6) ) ) ,4) ,-7) |(step(arpeggio((((X+transpose(arpeggio(step(X,12) ) ,7) ) +transpose(arpeggio(((X+transpose(X,7) ) +transpose(shuffle(X) ,7) ) ) ,4) ) +transpose((((X+transpose(X,12) ) +X) +transpose(arpeggio(X) ,4) ) ,7) ) ) ,12) +transpose(((transpose(shuffle(((X+transpose(X,12) ) +transpose(X,12) ) ) ,4) +((X|X) +transpose(transpose(((X+transpose(X,7) ) |transpose(X,4) ) ,-7) ,7) ) ) +transpose(step((((X|X) +transpose(X,12) ) +transpose(step(X,12) ,12) ) ,12) ,7) ) ,12) ) ) ) ,12) ) ,7) ) |shuffle(arpeggio((transpose(((echo((transpose(arpeggio(X) ,-5) +transpose(((shuffle(X) +X) +transpose((transpose(X,4) +transpose((X+transpose(X,7) ) ,12) ) ,12) ) ,-5) ) ,4,6) +transpose(shuffle(transpose(shuffle((step(X,12) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ) ,4) ) ,12) ) +transpose(step(transpose((step(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,12) |(transpose(transpose(X,-5) ,4) +(echo(transpose(X,-7) ,4,6) |transpose(((X+transpose(X,12) ) |X) ,-7) ) ) ) ,-5) ,12) ,12) ) ,-5) +transpose(step(transpose(shuffle(((((step(X,12) +transpose((arpeggio(X) +transpose((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,4) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) +transpose(((step(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,12) +transpose((shuffle(X) +transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,12) ) ,7) ) +transpose(shuffle((X+X) ) ,7) ) ,7) ) +transpose(shuffle(step((X+transpose(X,12) ) ,12) ) ,7) ) ) ,4) ,12) ,7) ) ) ) ) |(((arpeggio(arpeggio(transpose((shuffle(((X+transpose(X,12) ) +transpose(arpeggio(X) ,12) ) ) +transpose(arpeggio(X) ,12) ) ,-7) ) ) +transpose(arpeggio((((((((((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) +transpose(echo(X,4,6) ,-7) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((step(X,12) +transpose(X,7) ) ,4) ) +transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,7) ) ,12) ) +transpose(((transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,4) +transpose(transpose(X,4) ,12) ) +echo(((X+transpose(X,12) ) +transpose((X+transpose(arpeggio(X) ,7) ) ,7) ) ,4,6) ) ,7) ) +transpose(((arpeggio(echo(((step(step(X,12) ,12) +transpose(X,4) ) +transpose(step(echo((X+transpose(X,7) ) ,4,6) ,12) ,7) ) ,4,6) ) +((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose((X|X) ,4) ) +transpose(X,7) ) +transpose(echo((step(X,12) +transpose(echo(X,4,6) ,7) ) ,4,6) ,12) ) ) +(((step(((X+X) +transpose(X,12) ) ,12) +transpose(step(arpeggio((transpose(X,-7) |X) ) ,12) ,4) ) +transpose(step(echo(X,4,6) ,12) ,7) ) +transpose(transpose((transpose(X,4) +((X+transpose((X|X) ,7) ) +X) ) ,-5) ,12) ) ) ,4) ) +transpose(transpose(transpose(transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) ,-7) ,-5) ,-5) ,7) ) +transpose((step(step(step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) ,12) ,12) |transpose(transpose(X,-5) ,-5) ) ,7) ) ) ,4) ) +transpose((shuffle((transpose(shuffle(echo(echo((((transpose(arpeggio(X) ,-5) |((X+transpose(echo(shuffle(shuffle(X) ) ,4,6) ,4) ) +transpose((arpeggio(X) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ) +transpose(arpeggio(((echo(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4,6) +transpose(transpose(X,-7) ,7) ) +transpose((X+transpose(transpose(X,-7) ,12) ) ,12) ) ) ,4) ) +transpose(transpose(step(X,12) ,4) ,7) ) ,4,6) ,4,6) ) ,-5) +transpose(((step(transpose((transpose(((transpose((transpose(X,4) +shuffle(X) ) ,-7) +transpose(shuffle(X) ,7) ) +transpose(transpose(echo(arpeggio(echo(transpose(X,4) ,4,6) ) ,4,6) ,-5) ,7) ) ,4) +transpose(arpeggio((transpose(((((X+transpose(shuffle(X) ,4) ) +transpose(echo(X,4,6) ,7) ) |shuffle(transpose(X,4) ) ) +transpose(step(((X+transpose(X,4) ) +transpose((X|X) ,7) ) ,12) ,12) ) ,-7) +transpose((step((X+transpose(X,12) ) ,12) +transpose((X|(transpose(X,-5) +(X+transpose(X,12) ) ) ) ,12) ) ,12) ) ) ,12) ) ,4) ,12) +transpose((step(transpose((((transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,-5) +transpose(((X+transpose((X+X) ,7) ) +echo(X,4,6) ) ,7) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) +((((arpeggio(X) +transpose(X,12) ) +transpose((((X|X) +transpose((X|X) ,4) ) +transpose(X,7) ) ,4) ) +transpose((X+transpose(step(X,12) ,12) ) ,7) ) +transpose(shuffle(transpose(step((X+transpose(X,7) ) ,12) ,-7) ) ,12) ) ) ,4) ,12) +((transpose(((step(X,12) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-5) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(step(((((echo(X,4,6) |X) +transpose((transpose(X,4) +transpose(X,12) ) ,4) ) +transpose(transpose((arpeggio(X) +transpose((X+transpose(X,7) ) ,7) ) ,4) ,4) ) +transpose(((X+transpose(X,12) ) |shuffle((X+X) ) ) ,7) ) ,12) ,4) ,12) ) ) ,4) ) +transpose(transpose(step(echo(transpose(echo((X+transpose(X,7) ) ,4,6) ,-5) ,4,6) ,12) ,-7) ,7) ) ,7) ) ) +transpose(((((arpeggio(((((X+transpose(X,12) ) |X) +transpose((arpeggio(X) +transpose((shuffle(X) |shuffle(X) ) ,7) ) ,7) ) +(echo(echo(X,4,6) ,4,6) +(transpose(X,-5) +transpose(transpose(arpeggio(X) ,4) ,7) ) ) ) ) +transpose((((transpose((transpose(X,4) |(echo(X,4,6) |(X+transpose(X,7) ) ) ) ,-7) +transpose(transpose(transpose(arpeggio(X) ,-7) ,4) ,12) ) +arpeggio(transpose(step(X,12) ,-5) ) ) +transpose(shuffle(transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ) ,7) ) ,12) ) +echo(echo(arpeggio(((X+transpose(X,7) ) +shuffle(X) ) ) ,4,6) ,4,6) ) +transpose(transpose((transpose(((X|X) +transpose(echo(shuffle(X) ,4,6) ,12) ) ,-5) +transpose(step((((X+transpose(X,12) ) +transpose(shuffle(X) ,-7) ) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) ,12) ,12) ) ,4) ,12) ) +transpose((arpeggio(((transpose(((transpose(arpeggio((X+transpose(X,7) ) ) ,4) +transpose((transpose(transpose(X,-5) ,-7) +transpose(((transpose(X,-7) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X|X) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ,4) ) +transpose((X|X) ,7) ) ,4) +transpose(((((((X+transpose(X,12) ) +transpose(X,7) ) +(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ,7) ) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose(((((X+transpose((X|X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(shuffle(X) ,7) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) ,7) ) +(transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,12) ) ,4) +transpose((((transpose(transpose(X,-7) ,-5) +transpose(shuffle((X+transpose(step(X,12) ,12) ) ) ,7) ) +transpose(arpeggio((transpose((X+transpose(X,7) ) ,-5) +transpose(X,12) ) ) ,4) ) +transpose((transpose((step(X,12) +transpose(arpeggio(X) ,7) ) ,-7) +transpose(X,7) ) ,7) ) ,7) ) ) ,4) ) +transpose(transpose(transpose((X|X) ,4) ,-5) ,7) ) ) +transpose(shuffle(transpose(((arpeggio(echo(X,4,6) ) +transpose(((((transpose(X,4) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X|X) ,7) ) +transpose(X,7) ) +transpose((((echo(X,4,6) +transpose(X,12) ) +transpose(step(X,12) ,4) ) +transpose(echo(step(echo(X,4,6) ,12) ,4,6) ,7) ) ,7) ) ,7) ) +transpose((transpose(transpose(echo((((X+transpose(X,7) ) +(X+X) ) +transpose((X+transpose(X,7) ) ,12) ) ,4,6) ,4) ,-5) +arpeggio((transpose(X,-5) +transpose((X+transpose((transpose(X,4) |(X+transpose(X,12) ) ) ,7) ) ,7) ) ) ) ,12) ) ,-5) ) ,12) ) ,7) ) ,7) ) ,7) ) |(((((transpose(echo((arpeggio(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) +echo((X+transpose(X,7) ) ,4,6) ) ,4,6) ,-5) +transpose(((((transpose((transpose(X,4) +transpose(arpeggio(X) ,12) ) ,4) |((step((step(((X+transpose(transpose(X,4) ,4) ) +transpose(arpeggio(X) ,7) ) ,12) +transpose(arpeggio(((shuffle(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,12) ) ,12) +transpose(echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,4,6) ,12) ) +transpose((shuffle(((X+transpose(X,-5) ) +(transpose(X,-7) +transpose((X+transpose(X,7) ) ,7) ) ) ) |X) ,7) ) ) +transpose((transpose(step(arpeggio(step(((X+X) +arpeggio(X) ) ,12) ) ,12) ,-5) +transpose((step(transpose(X,-7) ,12) +transpose((step(X,12) +transpose(((X+transpose(X,7) ) +transpose(step(X,12) ,12) ) ,12) ) ,12) ) ,7) ) ,12) ) +transpose((transpose((((transpose((transpose((((X+transpose(X,12) ) +transpose(transpose(X,-7) ,4) ) +transpose(arpeggio(X) ,7) ) ,-7) +transpose(transpose(echo(X,4,6) ,-7) ,12) ) ,4) +transpose(arpeggio(X) ,12) ) +transpose(arpeggio(transpose(((X|X) +transpose(step(X,12) ,7) ) ,-7) ) ,4) ) +transpose(step(transpose(transpose(step(X,12) ,4) ,-7) ,12) ,7) ) ,-5) +transpose(transpose(step((shuffle((X+(X|X) ) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X+transpose(X,12) ) ) ,-7) ,7) ) ,12) ,-7) ,12) ) ,4) ) +transpose(transpose(arpeggio((transpose((((((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) +(transpose(X,4) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose(transpose((step(X,12) |shuffle(X) ) ,-5) ,4) ) +transpose(arpeggio(X) ,7) ) ,4) +transpose(((transpose((X+transpose((X+X) ,7) ) ,-5) +((transpose(X,4) +transpose(echo(X,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) ) +(shuffle((X+transpose(arpeggio(X) ,7) ) ) |((echo(X,4,6) +X) +transpose(shuffle(X) ,4) ) ) ) ,12) ) ) ,4) ,7) ) ,12) ) +transpose(shuffle(arpeggio((transpose(transpose((transpose(step(shuffle(transpose(X,-5) ) ,12) ,4) +transpose(transpose(shuffle(((echo(X,4,6) +transpose(shuffle(X) ,4) ) +transpose((X+X) ,7) ) ) ,4) ,7) ) ,-7) ,4) +transpose(shuffle(transpose((shuffle(step(transpose(X,-7) ,12) ) +transpose(shuffle(step(X,12) ) ,7) ) ,-7) ) ,7) ) ) ) ,12) ) +transpose((transpose((arpeggio(shuffle((X|(X|X) ) ) ) +transpose(echo(shuffle((arpeggio(X) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ) ,4,6) ,12) ) ,-5) +transpose(transpose(transpose(((((transpose((X+transpose(X,12) ) ,-5) |arpeggio(X) ) +transpose(shuffle(X) ,4) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) +transpose(echo(((X+transpose(X,7) ) +transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(transpose((X|X) ,4) ,7) ) ,7) ) ,4,6) ,7) ) ,4) ,4) ,12) ) ,12) ) +transpose(step(((shuffle(echo(((((shuffle(shuffle(X) ) +(arpeggio(X) +(X+X) ) ) +transpose(arpeggio(X) ,4) ) +transpose(((transpose(X,4) |echo(X,4,6) ) |arpeggio(X) ) ,7) ) +(transpose(transpose(transpose(X,-5) ,4) ,4) |arpeggio((((shuffle(X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(shuffle(X) ,7) ) |shuffle(X) ) ) ) ) ,4,6) ) +transpose(step(arpeggio(((transpose((shuffle(transpose(X,-5) ) +((X+transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) +transpose(transpose((shuffle(X) +transpose(echo(X,4,6) ,12) ) ,-5) ,7) ) ) ,-5) +transpose(echo(step(step((echo(shuffle(echo(X,4,6) ) ,4,6) +step((X+(X+X) ) ,12) ) ,12) ,12) ,4,6) ,4) ) +transpose(echo(step(step((X+transpose(X,7) ) ,12) ,12) ,4,6) ,7) ) ) ,12) ,4) ) +transpose((((transpose(step(((((echo(X,4,6) +echo(X,4,6) ) +transpose((echo(transpose(X,4) ,4,6) |((X+transpose(((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose((transpose(X,-5) +transpose(arpeggio(X) ,12) ) ,7) ) ) ,7) ) +transpose(transpose((transpose((X|(X+transpose(X,7) ) ) ,-7) +transpose(transpose((X+transpose(transpose(X,-7) ,12) ) ,-7) ,7) ) ,4) ,4) ) +transpose(echo((((echo(X,4,6) +transpose((X|X) ,-5) ) +transpose((step(echo(X,4,6) ,12) +transpose(transpose((X+transpose(X,12) ) ,-7) ,12) ) ,4) ) +transpose((X+transpose(transpose(X,4) ,12) ) ,7) ) ,4,6) ,7) ) ,12) ,-5) +transpose(arpeggio((echo(step((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,12) ) ) ,12) ,4,6) +transpose(arpeggio(transpose((transpose(arpeggio(transpose(X,-5) ) ,4) +transpose(step(echo(X,4,6) ,12) ,7) ) ,4) ) ,12) ) ) ,7) ) +transpose(((transpose(((X|X) +transpose(X,7) ) ,4) +transpose(transpose(shuffle(arpeggio(X) ) ,-5) ,7) ) +((arpeggio(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ) ) +transpose(step(step(step(arpeggio(X) ,12) ,12) ,12) ,4) ) +transpose(transpose((transpose((X+transpose(transpose(echo(X,4,6) ,-5) ,12) ) ,-7) +transpose((((X|X) +transpose((echo(X,4,6) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,12) ) ,12) ) ,4) ,7) ) ) ,12) ) +transpose(echo((shuffle((arpeggio(transpose(arpeggio(transpose(shuffle(X) ,4) ) ,-5) ) +transpose((step((((X+transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4) ) +transpose(((X+transpose(X,12) ) +(X+transpose(X,12) ) ) ,7) ) +transpose(arpeggio(echo(X,4,6) ) ,7) ) ,12) +transpose((shuffle((transpose(X,4) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose((X+transpose(X,12) ) ,12) ) ,7) ) ,7) ) ) +transpose((step(step(((X+((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(arpeggio((X+X) ) ,7) ) ,12) ,12) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(echo(X,4,6) ,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(shuffle((X+X) ) ,-7) ) ,7) ) ,12) ) ,4,6) ,7) ) ,7) ) ,12) ,4) ) +transpose(step((((echo(echo(((transpose(step(transpose(transpose(transpose(X,4) ,-5) ,-5) ,12) ,-7) |transpose((shuffle(((X+transpose((X+transpose(X,12) ) ,12) ) +transpose((X+transpose(X,12) ) ,4) ) ) +transpose((X|transpose((X+transpose(X,7) ) ,4) ) ,7) ) ,-5) ) |(transpose(((echo(X,4,6) +transpose(echo(X,4,6) ,7) ) +transpose(((X+transpose(X,7) ) |(X+transpose(X,12) ) ) ,7) ) ,-5) +transpose((((transpose(step(arpeggio(X) ,12) ,-7) +transpose(transpose((transpose(X,-7) +transpose(transpose(X,-5) ,12) ) ,-7) ,4) ) +transpose(arpeggio(shuffle(X) ) ,7) ) +transpose(arpeggio(step(transpose((X+transpose(X,12) ) ,-7) ,12) ) ,12) ) ,12) ) ) ,4,6) ,4,6) +transpose(((transpose((echo(arpeggio((X+transpose(X,7) ) ) ,4,6) |((echo((X+transpose(X,12) ) ,4,6) +transpose(((X+transpose(transpose(X,-7) ,7) ) |(arpeggio(X) +transpose(X,7) ) ) ,12) ) +transpose(((((shuffle(X) +arpeggio(X) ) +transpose(transpose((X+X) ,4) ,7) ) +transpose((X+transpose(echo(X,4,6) ,7) ) ,7) ) +transpose((X+X) ,7) ) ,7) ) ) ,-5) +transpose(shuffle(arpeggio(step(transpose((X|shuffle(X) ) ,4) ,12) ) ) ,4) ) +transpose(((arpeggio(arpeggio(transpose(arpeggio((X+transpose(transpose(X,-5) ,12) ) ) ,4) ) ) +transpose((((X+shuffle(shuffle(X) ) ) +transpose(transpose(transpose(arpeggio(X) ,-7) ,-7) ,12) ) +((shuffle(X) |echo(echo(X,4,6) ,4,6) ) +transpose(transpose(((transpose(shuffle(X) ,-5) +transpose((X+arpeggio(X) ) ,4) ) +transpose(transpose((shuffle(X) +transpose(transpose(X,-7) ,12) ) ,-7) ,7) ) ,-5) ,7) ) ) ,4) ) +transpose(shuffle(((echo((X|X) ,4,6) +transpose(echo(((((shuffle(((X+transpose(X,7) ) +transpose(X,12) ) ) +transpose((((X|X) +transpose(echo(shuffle(X) ,4,6) ,4) ) +transpose(transpose(step(X,12) ,-7) ,7) ) ,4) ) +transpose((X+X) ,7) ) +transpose((((X+X) +transpose((X+X) ,7) ) +transpose((X+transpose(step(X,12) ,12) ) ,7) ) ,4) ) +transpose((step(X,12) |transpose(X,4) ) ,7) ) ,4,6) ,4) ) +transpose((step(shuffle(X) ,12) +transpose((X+X) ,7) ) ,7) ) ) ,7) ) ,7) ) ,12) ) +transpose((echo(((((transpose(arpeggio((X+X) ) ,-5) +echo(echo((X+X) ,4,6) ,4,6) ) +transpose((step(echo(transpose(X,-5) ,4,6) ,12) +transpose(arpeggio(X) ,12) ) ,7) ) +transpose(step(step((((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) +transpose((X|X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) +transpose(((echo(X,4,6) |X) +step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ) ,12) ,12) ,12) ) +transpose(transpose(transpose((step(arpeggio((X+X) ) ,12) +transpose(((transpose(X,4) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,4) ,7) ) ,12) ) ,-5) ,4) ,12) ) ,4,6) +(shuffle((echo(((transpose(X,-7) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+X) ,7) ) ,4,6) +echo(((((X+transpose(transpose(X,-7) ,4) ) +transpose(shuffle(X) ,7) ) +transpose(transpose(transpose(X,4) ,4) ,12) ) |step(X,12) ) ,4,6) ) ) +(echo((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(step(echo((echo(X,4,6) +transpose((X+X) ,7) ) ,4,6) ,12) ,7) ) ,4,6) +transpose(transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) ,4) ,-7) ) ) ) ,4) ) +transpose(((step((X+transpose(X,12) ) ,12) +((X|(X|X) ) +transpose((((X+transpose(X,12) ) +transpose(shuffle(X) ,4) ) +transpose(shuffle(X) ,7) ) ,12) ) ) +transpose((echo((arpeggio(echo(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ) +transpose(transpose(transpose(((arpeggio((X+transpose((X|X) ,12) ) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,4) ) +transpose((transpose(X,4) +transpose(X,7) ) ,7) ) ,-7) ,-7) ,12) ) ,4,6) |echo(echo((arpeggio(((shuffle(X) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) |step((echo(X,4,6) +transpose((transpose(X,4) +transpose(transpose(X,4) ,12) ) ,7) ) ,12) ) ,4,6) ,4,6) ) ,7) ) ,7) ) ,12) ,7) ) ) ) +step(transpose(transpose((arpeggio((echo((transpose(arpeggio(step(transpose(X,-7) ,12) ) ,4) +transpose(transpose(step((echo(X,4,6) |arpeggio(((X+transpose(X,7) ) |shuffle(X) ) ) ) ,12) ,-7) ,7) ) ,4,6) |(((echo(transpose(shuffle(X) ,4) ,4,6) +transpose((transpose(shuffle(transpose((X+transpose(X,7) ) ,-7) ) ,-5) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(((echo(X,4,6) +((transpose(X,-7) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(echo(X,4,6) ,12) ) ) +transpose((transpose(X,-7) +transpose(transpose(X,-5) ,12) ) ,7) ) ,7) ) +transpose(arpeggio((((X+transpose(X,12) ) +transpose((((X+transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,4) ) +transpose((((X+transpose(X,12) ) +transpose(echo(X,4,6) ,4) ) +transpose(shuffle(X) ,7) ) ,7) ) ) ,12) ) ) ) +transpose(transpose((shuffle(((X+transpose(transpose(echo((X+X) ,4,6) ,-7) ,12) ) |step((step((X+transpose(X,7) ) ,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ) ) +transpose((step(step(X,12) ,12) +transpose((((transpose(transpose(X,-5) ,4) +transpose((X+transpose(arpeggio(X) ,7) ) ,12) ) +transpose(((transpose((X+transpose(X,7) ) ,-5) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) +transpose(((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) ,12) ) ,12) ) ,12) ) ,-5) ,7) ) ,-5) ,4) ,12) ) ,4,6) random seed used was 235327826

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