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(((shuffle((((echo(transpose(shuffle((transpose(transpose(X,-7) ,-7) +transpose(step(X,12) ,7) ) ) ,-7) ,4,6) +arpeggio(arpeggio(echo((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(step((X+transpose(X,7) ) ,12) ,7) ) +transpose(shuffle(X) ,7) ) ,4,6) ) ) ) +transpose(((echo(((arpeggio(transpose(transpose(X,-5) ,-7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(echo((shuffle(X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,7) ) ,4,6) +transpose(((X+transpose(X,12) ) |transpose(X,-7) ) ,4) ) +transpose((transpose((X+(X+transpose(X,12) ) ) ,-7) +transpose((((X+transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,-5) ,7) ) |((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,7) ) ,7) ) ,7) ) +transpose(step((shuffle(shuffle(((transpose(echo(X,4,6) ,4) +transpose(arpeggio(arpeggio(X) ) ,7) ) +shuffle((shuffle((((X+transpose(step(X,12) ,7) ) +transpose(step(transpose(X,4) ,12) ,4) ) +transpose((transpose(X,-7) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ) |echo(shuffle(echo(X,4,6) ) ,4,6) ) ) ) ) ) +transpose(step((echo(echo(transpose(X,4) ,4,6) ,4,6) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,12) ,7) ) ,12) ,7) ) ) +transpose(arpeggio(echo(((X|((arpeggio(transpose(X,-7) ) +transpose(echo(transpose(X,4) ,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) ) +transpose((((echo((arpeggio((transpose(X,-7) +transpose(transpose(X,-7) ,7) ) ) +transpose(((transpose(X,-7) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) ,4,6) +transpose((arpeggio((X|X) ) |(X+transpose(X,12) ) ) ,12) ) +transpose(shuffle((transpose(transpose((X+transpose(X,12) ) ,-7) ,-5) +transpose(transpose((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(((X+transpose(step(X,12) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,-5) ,7) ) ) ,7) ) +transpose(((transpose(((echo((X+transpose(X,12) ) ,4,6) +transpose(transpose(arpeggio((arpeggio(X) +X) ) ,-7) ,4) ) +transpose((echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,4,6) +transpose(transpose(transpose(arpeggio(X) ,-5) ,-5) ,7) ) ,7) ) ,-5) +transpose(echo(step((((X+transpose(X,4) ) +transpose(X,7) ) +(X+transpose((echo(X,4,6) |X) ,12) ) ) ,12) ,4,6) ,4) ) +transpose(((arpeggio((X|X) ) +transpose(arpeggio(step(X,12) ) ,12) ) |echo(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4,6) ) ,7) ) ,7) ) ,7) ) ,4,6) ) ,4) ) +transpose((((echo(echo(arpeggio((((step(echo(X,4,6) ,12) +transpose(arpeggio(X) ,4) ) +transpose(((X+transpose(X,12) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +transpose((shuffle(X) |X) ,12) ) ) ,4,6) ,4,6) +transpose((transpose((X+transpose(X,7) ) ,-7) +transpose(arpeggio((((X|X) +transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,12) ) ,7) ) +transpose((((((echo(echo(X,4,6) ,4,6) +transpose(((X+transpose(shuffle(X) ,7) ) +transpose((echo(shuffle(X) ,4,6) +transpose(X,12) ) ,7) ) ,4) ) +transpose((((X+transpose(arpeggio(transpose((X+X) ,4) ) ,4) ) +transpose(arpeggio(echo(X,4,6) ) ,7) ) +transpose((((transpose(X,-7) +transpose(X,4) ) +transpose((X+X) ,7) ) +transpose(X,7) ) ,12) ) ,7) ) +transpose((transpose(((((((X+transpose(X,7) ) +transpose(step(X,12) ,4) ) +transpose(X,7) ) |X) +transpose(transpose((transpose(X,-7) +transpose(step(X,12) ,7) ) ,4) ,4) ) +transpose(transpose(shuffle(X) ,-5) ,7) ) ,4) +transpose(shuffle(transpose((transpose((X+transpose(X,7) ) ,-7) +(X+transpose(X,12) ) ) ,-7) ) ,7) ) ,7) ) +transpose(arpeggio(arpeggio((((X+transpose(step(X,12) ,4) ) +transpose(X,7) ) +arpeggio(X) ) ) ) ,12) ) +transpose(arpeggio(shuffle((step(arpeggio(X) ,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) ,12) ) ,7) ) +transpose(echo((transpose(transpose(shuffle((((shuffle(X) +transpose((X+transpose((X+transpose(X,12) ) ,7) ) ,7) ) +transpose((X+transpose((((X+transpose(X,4) ) +transpose(X,7) ) |shuffle(X) ) ,12) ) ,12) ) +transpose((shuffle(X) +transpose(transpose(step(X,12) ,-7) ,12) ) ,7) ) ) ,-7) ,4) +transpose(transpose(((arpeggio((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +transpose(echo(((X+transpose(X,12) ) |X) ,4,6) ,4) ) +transpose((((step(X,12) +transpose(step(X,12) ,12) ) +transpose((X|X) ,7) ) +transpose((transpose(X,-5) +arpeggio(step(X,12) ) ) ,12) ) ,7) ) ,-7) ,-5) ) ,4,6) ,7) ) ,7) ) ,4,6) +transpose((shuffle((((arpeggio(echo(transpose(((arpeggio(transpose(arpeggio(transpose(echo(X,4,6) ,4) ) ,4) ) +transpose((shuffle(transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) +(step((X+transpose(X,12) ) ,12) +transpose((X+transpose(X,7) ) ,12) ) ) ,-7) ,4,6) ) +transpose(transpose((echo(step((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,12) ,4,6) +transpose(((arpeggio(transpose(X,-7) ) +transpose(step(X,12) ,12) ) +transpose(step(step(transpose(X,4) ,12) ,12) ,12) ) ,12) ) ,4) ,7) ) +transpose(arpeggio(transpose((step(step(((shuffle(X) +transpose(((X+transpose(X,12) ) +transpose(transpose(X,-7) ,7) ) ,7) ) +((step(X,12) +transpose(X,12) ) +transpose((X+(X+transpose(X,7) ) ) ,7) ) ) ,12) ,12) +step(transpose(arpeggio(((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,-7) ,12) ) ,-5) ) ,7) ) |step(((step((arpeggio((transpose(X,-7) |((transpose(X,-7) +transpose(X,-7) ) +transpose((transpose(X,-7) +transpose(X,7) ) ,7) ) ) ) |(transpose((X+transpose(X,7) ) ,-7) +transpose(((step(X,12) +transpose((X+X) ,4) ) +transpose(X,7) ) ,12) ) ) ,12) +transpose((((transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,4) ,-7) +transpose(transpose(transpose(transpose((X|transpose(X,-7) ) ,-5) ,-7) ,-5) ,12) ) +transpose(shuffle(transpose(transpose(echo((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4,6) ,4) ,-7) ) ,4) ) +transpose(transpose(step(((transpose(transpose((X+X) ,-5) ,4) +transpose((step(X,12) +transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) ,4) ) +transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,7) ) ,12) ,-5) ,7) ) ,4) ) +transpose(((arpeggio(arpeggio((X|arpeggio(arpeggio(X) ) ) ) ) |transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-7) ) +transpose(echo(transpose(((echo(echo(X,4,6) ,4,6) +transpose((X+X) ,-5) ) |echo((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ) ,-7) ,4,6) ,7) ) ,7) ) ,12) ) ) +transpose(((shuffle(((echo((((((X+transpose(X,12) ) +transpose(X,-5) ) +transpose(echo(X,4,6) ,7) ) +transpose(echo(arpeggio(step(transpose(X,-7) ,12) ) ,4,6) ,7) ) +transpose(transpose(transpose(((echo(((echo(X,4,6) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) +transpose(arpeggio(((X|X) +transpose(X,12) ) ) ,12) ) +transpose(((transpose(echo((X+X) ,4,6) ,-7) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) +transpose(transpose((((X+transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) +transpose(((X+transpose(X,12) ) |transpose(X,4) ) ,12) ) ,-7) ,7) ) ,12) ) ,4) ,-5) ,7) ) ,4,6) +transpose((transpose(transpose(transpose(step((transpose(X,-7) |echo(X,4,6) ) ,12) ,-7) ,-7) ,-7) |transpose(step((transpose(echo(X,4,6) ,-7) |(X+transpose(shuffle(X) ,7) ) ) ,12) ,-7) ) ,12) ) +transpose((step((((((transpose(X,-7) +shuffle(transpose(X,-7) ) ) +transpose((X+transpose((X+X) ,7) ) ,12) ) +arpeggio(((transpose((X+X) ,-5) +transpose(((X|X) +X) ,12) ) +transpose(echo(X,4,6) ,12) ) ) ) +transpose(((transpose(echo(echo(((X|X) +transpose(X,7) ) ,4,6) ,4,6) ,-7) |((transpose((X+transpose(X,7) ) ,-7) +transpose(transpose(transpose(X,4) ,-5) ,12) ) |(transpose(((shuffle(X) +transpose((X|transpose(X,-7) ) ,4) ) +transpose(echo((X+X) ,4,6) ,7) ) ,-7) +transpose(arpeggio((X+transpose(X,12) ) ) ,12) ) ) ) +transpose(transpose((((((echo(X,4,6) +transpose(arpeggio(X) ,7) ) +transpose(transpose(shuffle(X) ,-7) ,12) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(shuffle((transpose(X,4) |transpose((X+transpose(X,12) ) ,-7) ) ) ,4) ) +transpose(echo(transpose(arpeggio(echo(X,4,6) ) ,4) ,4,6) ,7) ) ,-7) ,12) ) ,7) ) +transpose(step(((arpeggio(arpeggio((X+transpose(X,7) ) ) ) +transpose((X+transpose((echo(X,4,6) +transpose(X,12) ) ,12) ) ,4) ) +transpose(transpose(((arpeggio(X) +(X|X) ) +transpose(step(step(X,12) ,12) ,12) ) ,-5) ,7) ) ,12) ,12) ) ,12) +transpose(transpose(arpeggio((echo((transpose(step(step(transpose(X,4) ,12) ,12) ,-7) +transpose(transpose(arpeggio((transpose((X|X) ,-7) +transpose((shuffle(X) +transpose(echo(X,4,6) ,12) ) ,7) ) ) ,-5) ,12) ) ,4,6) +transpose(echo(((arpeggio((step(X,12) +((X+transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ) +transpose(arpeggio(transpose(echo(X,4,6) ,-7) ) ,7) ) +step((X+transpose(X,12) ) ,12) ) ,4,6) ,7) ) ) ,-7) ,7) ) ,7) ) ) +transpose(((echo(step((((((step(X,12) +transpose((shuffle(X) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) +(((X+transpose(X,12) ) +transpose(arpeggio(X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) +transpose(shuffle(step(shuffle((X+X) ) ,12) ) ,7) ) +transpose(transpose(step(transpose(arpeggio(X) ,-7) ,12) ,-7) ,12) ) ,12) ,4,6) +((transpose(step(transpose(((step(X,12) +transpose(transpose(X,-5) ,7) ) +transpose((X+transpose(X,12) ) ,12) ) ,-7) ,12) ,-7) +transpose((transpose((transpose(X,-7) +((((X|X) +transpose(X,7) ) +transpose((X+echo(X,4,6) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,4) |((echo(echo(arpeggio(transpose(X,4) ) ,4,6) ,4,6) +transpose((transpose(X,-7) +transpose(X,7) ) ,4) ) +transpose((transpose(shuffle(X) ,-7) |(arpeggio(transpose(X,-7) ) +transpose(((X+X) +transpose(transpose(X,-5) ,12) ) ,12) ) ) ,7) ) ) ,4) ) +transpose(transpose(shuffle(echo(shuffle(arpeggio((shuffle(X) +transpose((transpose(X,-7) +transpose((X|X) ,12) ) ,12) ) ) ) ,4,6) ) ,-5) ,7) ) ) +transpose((arpeggio(shuffle(((arpeggio(transpose(shuffle(((X+X) +transpose(transpose(X,4) ,12) ) ) ,-7) ) +transpose(echo(((transpose(echo(X,4,6) ,-7) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(echo(step(X,12) ,4,6) ,-5) ,7) ) ,4,6) ,4) ) +transpose((step(transpose(transpose(X,-7) ,-5) ,12) +step(transpose(transpose(X,-7) ,-5) ,12) ) ,7) ) ) ) +transpose((((shuffle(shuffle(step(arpeggio(shuffle(transpose(X,-7) ) ) ,12) ) ) |(transpose((step(((X+transpose(transpose(X,-5) ,12) ) +transpose(((X+X) +transpose(transpose(X,4) ,12) ) ,12) ) ,12) |X) ,-7) +step(arpeggio((((X|X) +transpose((X+transpose(X,12) ) ,12) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,12) ) ) ,12) ) ) +transpose((step(transpose((((X+transpose(X,7) ) +transpose(X,12) ) +transpose(X,7) ) ,-7) ,12) +transpose(shuffle(shuffle((((transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,12) ) ,-7) ,-7) +transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ) +transpose(transpose(shuffle(X) ,-5) ,7) ) +transpose((step(((transpose(X,-5) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,12) +transpose((((X|X) +transpose(X,7) ) +transpose(transpose((X+transpose(transpose(X,-7) ,7) ) ,-7) ,7) ) ,7) ) ,-7) ) ) ) ,7) ) ,4) ) +transpose(step((shuffle(((((transpose(X,-7) +transpose(transpose(echo(X,4,6) ,-5) ,4) ) +transpose(transpose((arpeggio(X) +echo(X,4,6) ) ,-5) ,7) ) +step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(arpeggio(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ) ) +(transpose(transpose(echo(shuffle(echo(X,4,6) ) ,4,6) ,-5) ,-7) +transpose(echo(((step(transpose(transpose(X,-7) ,-7) ,12) +echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) +X) ,4,6) ,7) ) ) ,12) ,7) ) ,7) ) ,12) ) ,12) ) |transpose(echo(((echo((arpeggio((transpose(X,-5) +transpose((X+X) ,7) ) ) +transpose(((shuffle(shuffle(X) ) +transpose(X,12) ) +transpose(transpose(transpose(X,-5) ,-5) ,12) ) ,7) ) ,4,6) +transpose(arpeggio(arpeggio((transpose(transpose(transpose(X,-5) ,4) ,4) |transpose(((step((X|X) ,12) +transpose(((X|X) +X) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ,-5) ) ) ) ,4) ) +transpose(((shuffle(arpeggio((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ) ) +transpose(transpose(step((arpeggio(transpose(step(X,12) ,4) ) +transpose(arpeggio(X) ,-7) ) ,12) ,-7) ,4) ) +transpose(transpose(((X+X) +transpose(X,7) ) ,-7) ,7) ) ,7) ) ,4,6) ,-7) ) ,7) ) ,4) ) +transpose(transpose((echo((((shuffle(((transpose(transpose(step((transpose(X,4) +transpose(((X+X) +transpose(echo(X,4,6) ,7) ) ,7) ) ,12) ,-7) ,-5) +transpose(echo(shuffle(transpose(step((echo(transpose(transpose(X,4) ,4) ,4,6) +transpose(((echo((X+transpose(X,12) ) ,4,6) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,12) ,-7) ) ,4,6) ,4) ) +transpose(transpose(transpose((arpeggio(arpeggio(X) ) +((X+transpose(X,7) ) +transpose(X,7) ) ) ,-7) ,-5) ,7) ) ) +transpose((transpose(transpose(echo((((step(X,12) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(X,-7) ) ,4,6) ,-7) ,4) +transpose(transpose(transpose(transpose(((transpose((X|X) ,-7) +transpose((transpose(echo(X,4,6) ,-7) +step(step(X,12) ,12) ) ,4) ) +transpose(step(transpose(X,-7) ,12) ,7) ) ,4) ,-7) ,-7) ,12) ) ,4) ) +transpose(transpose((arpeggio(echo((transpose(step(transpose(X,4) ,12) ,-5) +transpose(transpose((echo(echo(X,4,6) ,4,6) |(((X+X) +transpose(X,4) ) +transpose((X|X) ,7) ) ) ,-7) ,12) ) ,4,6) ) +transpose((shuffle(echo(arpeggio(X) ,4,6) ) |(((shuffle(transpose(X,-7) ) |shuffle(echo(X,4,6) ) ) +((X|X) +echo(X,4,6) ) ) |(X+X) ) ) ,12) ) ,-7) ,7) ) +transpose(((((transpose(step((arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ) +transpose(X,7) ) ,12) ,4) +transpose(step(arpeggio(transpose(shuffle(X) ,-5) ) ,12) ,4) ) +transpose(((((((transpose(transpose(((X+transpose(shuffle(X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,-7) ,-7) +transpose(echo(((X+X) +transpose(arpeggio(X) ,12) ) ,4,6) ,4) ) +transpose(transpose((X|step(X,12) ) ,4) ,7) ) +shuffle(((X+transpose(X,12) ) +transpose(((step(X,12) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ) ) +transpose((((((step(X,12) |X) +transpose(echo(X,4,6) ,7) ) +transpose((X+X) ,4) ) +transpose(echo((transpose(echo(X,4,6) ,-7) |echo(X,4,6) ) ,4,6) ,7) ) +transpose(transpose(transpose(X,4) ,4) ,12) ) ,4) ) +transpose(transpose(transpose((transpose(transpose(X,-7) ,4) +transpose(transpose(X,4) ,12) ) ,-7) ,4) ,7) ) +transpose(step(shuffle(shuffle(X) ) ,12) ,7) ) ,7) ) +transpose((((transpose(step((X+transpose(X,7) ) ,12) ,-7) +transpose((step((X|X) ,12) |(echo(echo(((echo((X|X) ,4,6) +transpose(echo((X+X) ,4,6) ,4) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ,4,6) ,4,6) +transpose(transpose(transpose((X|X) ,-7) ,-7) ,7) ) ) ,7) ) +transpose(((transpose(shuffle(echo((transpose((X+X) ,-7) +transpose(arpeggio(echo(transpose(X,-7) ,4,6) ) ,7) ) ,4,6) ) ,-7) +transpose(shuffle(transpose((X+transpose(shuffle(X) ,12) ) ,-7) ) ,4) ) +transpose((transpose(((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) ,4) +(echo(X,4,6) +transpose((X+transpose(X,7) ) ,7) ) ) ,7) ) ,4) ) +transpose(transpose((echo(transpose(echo((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,4,6) ,-7) ,4,6) +transpose(((((((X+transpose(X,7) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4) ) +transpose(((shuffle(X) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) +(arpeggio(X) |step(transpose(X,-7) ,12) ) ) +transpose(arpeggio(transpose(transpose(X,-7) ,-7) ) ,4) ) +transpose((transpose(((((X+X) +transpose(X,7) ) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) |transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,4) ,4) ) ,7) ) ,12) ) ,-5) ,7) ) ,7) ) +transpose(((transpose(transpose(echo(((step((X+transpose(X,7) ) ,12) +transpose((shuffle(step(X,12) ) |X) ,4) ) +transpose((arpeggio(X) +transpose(transpose(X,-7) ,7) ) ,7) ) ,4,6) ,-7) ,4) +transpose(transpose((step((X+transpose(((X|X) +transpose(transpose(X,-7) ,12) ) ,7) ) ,12) +transpose(((transpose((X+transpose(X,7) ) ,-7) +transpose((transpose(X,-7) +transpose(arpeggio(X) ,7) ) ,12) ) |((transpose((X|X) ,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) |(transpose(echo(X,4,6) ,-7) +transpose(step(shuffle(X) ,12) ,7) ) ) ) ,12) ) ,4) ,7) ) +transpose((((X+((X+transpose(X,7) ) +arpeggio(X) ) ) +transpose(echo((step((X+transpose(X,12) ) ,12) +transpose(X,7) ) ,4,6) ,7) ) +transpose(transpose(echo(transpose((((step((step(X,12) +transpose(arpeggio(arpeggio(X) ) ,7) ) ,12) +transpose(((transpose(transpose(X,-7) ,-7) +transpose(transpose(transpose(X,-5) ,-5) ,4) ) +transpose((arpeggio(X) +transpose(((shuffle(X) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ,7) ) ,12) ) +transpose(transpose(transpose(X,-7) ,-7) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ,4) ,4,6) ,4) ,12) ) ,12) ) ,7) ) ,7) ) ,4,6) |transpose(shuffle(arpeggio((step(step(step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,7) ) ,12) ,12) ,12) +transpose(arpeggio(shuffle(echo((transpose(transpose(transpose(transpose(X,-5) ,4) ,-7) ,-7) +transpose(echo(X,4,6) ,-7) ) ,4,6) ) ) ,7) ) ) ) ,-7) ) ,4) ,7) ) +transpose(arpeggio(echo(shuffle(((((((shuffle(transpose(transpose(arpeggio((X+transpose(X,7) ) ) ,-7) ,-7) ) +(((echo((arpeggio(X) +(X+transpose((X+transpose(X,12) ) ,12) ) ) ,4,6) +transpose(arpeggio((X+transpose(X,12) ) ) ,12) ) +transpose(echo(echo(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,4,6) ,4,6) ,4) ) +transpose((step(arpeggio(X) ,12) +transpose(shuffle(X) ,12) ) ,7) ) ) +transpose(((shuffle(transpose(transpose(X,4) ,-7) ) +transpose((transpose(X,-7) +transpose(transpose(transpose(X,-7) ,-7) ,12) ) ,7) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) ,4) ) +transpose(step((step((shuffle(transpose((X+transpose(X,12) ) ,-7) ) +transpose(((transpose(transpose(X,-7) ,-5) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((transpose(X,4) +(X+X) ) ,7) ) ,12) ) ,12) |(echo((X+transpose(X,7) ) ,4,6) +transpose(transpose(transpose(step(X,12) ,-7) ,4) ,12) ) ) ,12) ,7) ) +transpose(transpose(echo(((transpose(((transpose(echo(X,4,6) ,4) +transpose(echo(shuffle(X) ,4,6) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) ,7) ) ,4) |((transpose((arpeggio((X+transpose(X,12) ) ) |(X+transpose((X+transpose(X,12) ) ,12) ) ) ,-7) +transpose(echo(step(X,12) ,4,6) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose(((step(((X+X) +transpose((X+transpose(X,12) ) ,7) ) ,12) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,7) ) ,12) ) ,4,6) ,-7) ,4) ) +transpose(echo(step(((transpose(((transpose((X|X) ,4) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,-7) +transpose(echo(shuffle(X) ,4,6) ,4) ) +transpose(step(echo((transpose(transpose(X,-7) ,4) |transpose(X,-7) ) ,4,6) ,12) ,7) ) ,12) ,4,6) ,7) ) |transpose((transpose((echo(transpose(X,4) ,4,6) +transpose(transpose((X+transpose(echo(X,4,6) ,12) ) ,-5) ,7) ) ,4) +transpose(step(step(((transpose(transpose(X,-5) ,-5) +transpose((X+X) ,4) ) +transpose(step(X,12) ,7) ) ,12) ,12) ,12) ) ,-5) ) ) ,4,6) ) ,4) ) +transpose(arpeggio(transpose(echo(shuffle((((transpose(arpeggio((X+X) ) ,-7) +transpose(((((step((transpose(X,-7) +transpose(transpose(X,-7) ,12) ) ,12) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +transpose(echo(X,4,6) ,12) ) |(((echo(X,4,6) +transpose(((X+transpose(X,12) ) +X) ,4) ) +transpose(step(X,12) ,7) ) +transpose((transpose(arpeggio(X) ,4) +transpose((step((X+transpose(X,7) ) ,12) |((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,12) ) ,7) ) ) +transpose(transpose(step(((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(transpose(transpose(arpeggio(arpeggio(X) ) ,-7) ,-5) ,4) ) +transpose(((transpose(transpose(transpose(X,-7) ,-7) ,4) +transpose((arpeggio(transpose(X,-7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) ,7) ) ,12) ,-7) ,12) ) ,12) ) |transpose(transpose(step((shuffle(arpeggio((step(X,12) +transpose(transpose(X,-7) ,12) ) ) ) +transpose(transpose(step(arpeggio(X) ,12) ,4) ,12) ) ,12) ,-7) ,4) ) |shuffle(transpose(arpeggio(((transpose(X,-7) +transpose(arpeggio(transpose(X,-7) ) ,4) ) +transpose((X|step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) ) ,-5) ) ) ) ,4,6) ,-7) ) ,7) ) random seed used was 222704235

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