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 15 generations the expression "X" became this: arpeggio(transpose((step(((step(echo((((arpeggio(X) +transpose(X,12) ) +transpose(((X|X) |(X+transpose(X,12) ) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,4,6) ,12) +transpose((transpose(transpose(X,-5) ,4) +transpose(arpeggio((((step(X,12) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) |((X|X) +transpose((X+X) ,12) ) ) ) ,12) ) ,7) ) +transpose((step((X+transpose((X+transpose(echo(shuffle(X) ,4,6) ,7) ) ,7) ) ,12) +transpose(X,7) ) ,7) ) ,12) +step(shuffle((transpose((transpose(X,-7) +transpose(X,7) ) ,4) +transpose(((arpeggio(X) +transpose(echo(X,4,6) ,4) ) +transpose((X|X) ,7) ) ,12) ) ) ,12) ) ,-7) ) random seed used was 10 EXPR = ((((echo((((echo((echo(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4,6) +transpose(transpose(X,-5) ,7) ) ,4,6) +transpose(shuffle(shuffle((shuffle(X) +(X+X) ) ) ) ,12) ) +transpose(step((transpose(X,-7) +transpose((X+transpose((X+X) ,7) ) ,7) ) ,12) ,12) ) +transpose(arpeggio((((step(transpose((transpose(X,-5) +(echo(X,4,6) +transpose(X,12) ) ) ,4) ,12) +transpose(shuffle(shuffle((arpeggio((echo(X,4,6) +transpose((X+X) ,7) ) ) |((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(transpose(X,-5) ,7) ) ) ) ) ,4) ) +transpose(transpose((((X|transpose(X,-7) ) +transpose(X,4) ) +transpose(((((transpose(X,-5) +transpose((X|X) ,12) ) +transpose(((X+transpose(X,7) ) +(X+transpose(X,12) ) ) ,4) ) +transpose((echo(X,4,6) +transpose(X,7) ) ,7) ) +transpose(((arpeggio(transpose(X,4) ) +transpose((X+transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) ,12) ) ,7) ) ,4) ,7) ) +transpose(((arpeggio(transpose(step(arpeggio(transpose(X,4) ) ,12) ,4) ) +(((echo((X+transpose(X,7) ) ,4,6) +transpose(step(X,12) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) +transpose(echo(X,4,6) ,7) ) ) +(transpose(arpeggio(X) ,4) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,12) ) ) ,12) ) ,4,6) +transpose(transpose(echo((((transpose(arpeggio(X) ,-7) +(transpose(X,-5) +transpose(X,12) ) ) +transpose(((transpose(((X|X) +transpose(step(X,12) ,12) ) ,-7) |echo((shuffle(transpose(X,4) ) +transpose((X+transpose(X,7) ) ,4) ) ,4,6) ) +transpose(((((X+X) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) +transpose(X,12) ) ,12) ) ,4) ) +transpose((((((X+transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose(transpose(shuffle(X) ,4) ,7) ) +transpose(step((X+X) ,12) ,4) ) +transpose(transpose(step(X,12) ,4) ,7) ) ,7) ) ,4,6) ,-7) ,7) ) +transpose((transpose(((((step((echo((arpeggio(step(X,12) ) +transpose(transpose((transpose(X,-5) +transpose(X,7) ) ,4) ,7) ) ,4,6) +arpeggio(transpose(echo((step(X,12) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) ,4) ) ) ,12) +transpose(step(shuffle((step((transpose(X,4) +transpose(echo(X,4,6) ,7) ) ,12) +transpose((echo(((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,4,6) +transpose((X|X) ,7) ) ,12) ) ) ,12) ,4) ) +transpose((((((transpose(X,-7) +transpose(shuffle((X|X) ) ,4) ) +transpose(step(X,12) ,7) ) +transpose(((echo(X,4,6) +transpose(((X+transpose((X|X) ,4) ) +transpose(step(X,12) ,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) +transpose(step(((echo((((X+transpose(X,12) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4) ) +transpose(((X+transpose(X,12) ) +transpose((X+X) ,7) ) ,7) ) ,4,6) +transpose(step(arpeggio((X+transpose(X,12) ) ) ,12) ,12) ) +transpose(step((X|X) ,12) ,12) ) ,12) ,12) ) +((echo((X+transpose((X+X) ,12) ) ,4,6) +transpose(arpeggio(transpose((shuffle(X) |X) ,-5) ) ,4) ) +transpose(arpeggio(transpose(X,-7) ) ,7) ) ) ,7) ) +transpose(((((transpose((X+transpose(shuffle(X) ,7) ) ,-5) +transpose(transpose((X+X) ,-5) ,7) ) +transpose(shuffle(transpose(echo(X,4,6) ,-5) ) ,4) ) +transpose(((arpeggio(X) +transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ) +transpose(transpose(step(X,12) ,4) ,7) ) ,7) ) +((arpeggio((step((X+transpose(X,12) ) ,12) |transpose(X,-5) ) ) +transpose((step(arpeggio((((X|transpose(X,-5) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose((X+transpose(X,12) ) ,12) ) ) ,4) ) +transpose((X+X) ,7) ) ) ,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(transpose(transpose((step((X+transpose(step(X,12) ,7) ) ,12) |echo(transpose(step(X,12) ,-5) ,4,6) ) ,4) ,-7) ,7) ) ) ,4) ) +transpose(((((((transpose(echo(shuffle(shuffle(X) ) ,4,6) ,4) +transpose((((X+X) +transpose(transpose(arpeggio(X) ,-7) ,12) ) +transpose(X,7) ) ,12) ) |(transpose(((step(step(step(X,12) ,12) ,12) +transpose(arpeggio((X+transpose(X,12) ) ) ,4) ) +transpose(step(X,12) ,7) ) ,-5) +transpose((shuffle(transpose(X,4) ) +transpose(transpose(X,-5) ,12) ) ,12) ) ) +transpose(echo(((((shuffle(X) |(X+transpose(X,7) ) ) +transpose(step(X,12) ,4) ) +transpose(X,7) ) +transpose((transpose(X,4) +(X+transpose(X,7) ) ) ,7) ) ,4,6) ,12) ) +transpose(transpose(((X+transpose(X,7) ) |echo(X,4,6) ) ,4) ,4) ) +transpose(transpose(((step(arpeggio((X+transpose(X,12) ) ) ,12) +transpose((arpeggio(X) +transpose((step(X,12) +transpose((X|X) ,12) ) ,12) ) ,4) ) +transpose((step(X,12) |transpose(X,-7) ) ,7) ) ,4) ,7) ) +transpose(((echo((((((X|X) +transpose((X|X) ,4) ) +transpose((X|X) ,7) ) +transpose(echo(arpeggio(X) ,4,6) ,4) ) +transpose((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) |transpose(X,-7) ) ,7) ) ,4,6) +transpose(arpeggio(echo((((X+transpose(X,4) ) +transpose(X,7) ) |arpeggio(X) ) ,4,6) ) ,4) ) +transpose((transpose(echo((X+transpose(X,7) ) ,4,6) ,4) +transpose(transpose((step(shuffle(X) ,12) +transpose(transpose(step(echo(X,4,6) ,12) ,4) ,7) ) ,-7) ,12) ) ,7) ) ,7) ) ,7) ) ,-7) +transpose(transpose((transpose((shuffle(echo(((transpose(X,-5) +transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ) +transpose((X|X) ,7) ) ,4,6) ) +transpose(step(echo((((X+((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((step(X,12) +transpose(X,7) ) ,7) ) +transpose((transpose(X,-5) +transpose(transpose(transpose(X,4) ,4) ,12) ) ,12) ) ,4,6) ,12) ,12) ) ,-7) +transpose((arpeggio(((((((X+transpose(shuffle(X) ,7) ) +transpose(shuffle(X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose((((((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) +transpose(X,4) ) +transpose((arpeggio(X) +((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,7) ) ,12) ) +transpose(((transpose(transpose((X+transpose(X,7) ) ,-5) ,-7) +transpose(((echo((X+X) ,4,6) +transpose(echo(X,4,6) ,12) ) |(((X|X) +transpose(transpose(X,-7) ,4) ) +transpose((X+transpose((X+transpose(X,12) ) ,7) ) ,7) ) ) ,7) ) +transpose((shuffle(X) +transpose(((X+transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) +transpose(((X+transpose((X+transpose(X,12) ) ,12) ) +transpose(shuffle(X) ,12) ) ,12) ) ,12) ) ,7) ) ,4) ) +transpose((echo(transpose(X,4) ,4,6) +transpose(((((X+transpose(echo(X,4,6) ,7) ) |((echo(X,4,6) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) +transpose((shuffle(step(X,12) ) +transpose(X,7) ) ,12) ) ,12) ) ,7) ) ) +shuffle(((echo((arpeggio(X) +transpose(((X|X) |X) ,12) ) ,4,6) +transpose((arpeggio(((X|X) +transpose(arpeggio(X) ,7) ) ) +(transpose(X,-5) +transpose((X+transpose(X,12) ) ,12) ) ) ,7) ) |(((arpeggio((((X+X) +transpose(X,4) ) +transpose(X,7) ) ) +transpose(echo((X+X) ,4,6) ,7) ) +transpose((((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(arpeggio(transpose((X+transpose(X,12) ) ,-7) ) ,7) ) ) ) ) ,7) ) ,-5) ,7) ) ,4) ) +transpose(echo(arpeggio(((((step(X,12) +transpose((((echo(shuffle(step(X,12) ) ,4,6) +transpose((echo(X,4,6) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +transpose(X,4) ) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) ,4) ) +transpose(((shuffle(X) +transpose(arpeggio(X) ,7) ) +transpose(((transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) +transpose(((X+transpose(X,7) ) +transpose(transpose(X,-5) ,-7) ) ,4) ) +transpose((((transpose(X,-5) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ,12) ) ,7) ) +transpose((transpose((X+X) ,-5) +step((X|X) ,12) ) ,7) ) +transpose(transpose((transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,-5) +transpose(transpose(arpeggio(((X+transpose(step(X,12) ,4) ) +transpose(X,7) ) ) ,4) ,-5) ) ,4) ,7) ) ) ,4,6) ,7) ) +transpose(step((step(step(arpeggio(echo(step((X+transpose(X,7) ) ,12) ,4,6) ) ,12) ,12) +transpose(transpose((((echo(step(transpose(X,-7) ,12) ,4,6) +transpose(shuffle((((shuffle(transpose((X+transpose(X,12) ) ,4) ) +transpose(((shuffle((shuffle(X) +transpose(X,7) ) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ) +transpose(arpeggio(echo(X,4,6) ) ,7) ) ,4) ) +transpose(step(arpeggio(X) ,12) ,7) ) +step(((echo(step(X,12) ,4,6) +transpose(X,7) ) +transpose(shuffle((X+transpose(transpose(X,-5) ,7) ) ) ,12) ) ,12) ) ) ,4) ) +transpose((transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ,4) +transpose((((((((X+transpose(X,7) ) +transpose(((X|X) |transpose(X,4) ) ,4) ) +transpose(X,7) ) +transpose(shuffle(((X+transpose(X,12) ) +(X|X) ) ) ,7) ) +transpose(arpeggio(X) ,7) ) +transpose(echo(shuffle(((X+transpose(X,7) ) |X) ) ,4,6) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,7) ) +transpose(transpose(step((arpeggio((((shuffle(X) +transpose(X,4) ) +transpose((X|X) ,7) ) +transpose((step(X,12) +(X+transpose(X,12) ) ) ,12) ) ) +transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,12) ) ,12) ,-5) ,12) ) ,-7) ,12) ) ,12) ,12) ) random seed used was 0 NOTE: Generated phrase was too large ( 6752 ) , it has been truncated at 5000 notes. EXPR = ((transpose(((((arpeggio(step(X,12) ) +transpose((((((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X|X) ,7) ) +transpose(shuffle(step(X,12) ) ,4) ) +transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,7) ) ,7) ) +transpose(((((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) +transpose(shuffle(shuffle(arpeggio(X) ) ) ,12) ) +transpose(transpose(transpose(step(X,12) ,-7) ,4) ,12) ) ,4) ) +transpose(step((X|(step(X,12) +transpose(X,12) ) ) ,12) ,7) ) +transpose((arpeggio(transpose(X,4) ) +transpose(((arpeggio((((X+transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(shuffle(X) ,12) ) ,7) ) ) +transpose(arpeggio(((transpose(transpose(X,-7) ,-5) |transpose(X,-7) ) |transpose(X,4) ) ) ,12) ) +transpose(((step((shuffle(X) +arpeggio(X) ) ,12) +transpose(arpeggio(echo((transpose(transpose(X,4) ,4) |transpose((X+transpose(X,12) ) ,4) ) ,4,6) ) ,4) ) +transpose(arpeggio(((echo(X,4,6) +transpose(step(((X+transpose(X,7) ) +transpose((X+X) ,7) ) ,12) ,4) ) +transpose(shuffle(arpeggio(X) ) ,7) ) ) ,7) ) ,12) ) ,12) ) ,7) ) ,-7) +transpose(echo((((transpose(echo(((arpeggio(X) +transpose((arpeggio(X) +transpose(step(X,12) ,12) ) ,4) ) +transpose(transpose(arpeggio(X) ,-5) ,7) ) ,4,6) ,-5) +shuffle((((X+transpose(X,7) ) +transpose((X|X) ,7) ) +transpose((((X+X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,12) ) ) ) +transpose((step((transpose(((echo((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(step((step(X,12) +transpose(X,12) ) ,12) ,7) ) ,4,6) +transpose(transpose(echo(((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4,6) ,-5) ,4) ) +transpose((transpose(transpose(X,4) ,-5) +transpose(transpose(((echo(X,4,6) +transpose(X,12) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ,12) ) ,7) ) ,-7) +transpose(echo(echo(transpose((echo(X,4,6) +((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,-5) ,4,6) ,4,6) ,12) ) ,12) +transpose(arpeggio((((echo(arpeggio((X+transpose(step(X,12) ,7) ) ) ,4,6) +transpose((transpose(X,-5) +(X+transpose(X,12) ) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose(arpeggio(echo((X+X) ,4,6) ) ,4) ,12) ) ) ,7) ) ,4) ) +transpose(transpose(shuffle(transpose(step(((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,12) ) ,12) ,-7) ) ,4) ,7) ) ,4,6) ,4) ) +transpose(transpose(transpose((transpose(shuffle(arpeggio(shuffle((X|X) ) ) ) ,-7) +transpose(((echo(step(step(((X|X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,12) ,4,6) |transpose(transpose(transpose((X+X) ,-7) ,-7) ,-7) ) +transpose(((step(arpeggio(X) ,12) +transpose(((transpose(((shuffle(X) +transpose(step(((X|X) +X) ,12) ,4) ) +transpose(shuffle(transpose(X,-7) ) ,7) ) ,-5) +transpose(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ,4) ) +transpose(arpeggio(echo(X,4,6) ) ,7) ) ,12) ) |step((((arpeggio(echo(X,4,6) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose((X+transpose(echo(X,4,6) ,12) ) ,4) ,12) ) +transpose(step(((step(X,12) +transpose(X,4) ) +transpose((X+X) ,7) ) ,12) ,12) ) ,12) ) ,12) ) ,12) ) ,4) ,-5) ,7) ) random seed used was 0 EXPR = (((transpose(((shuffle((X+transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(X|X) ) ,7) ) ) +transpose((arpeggio((step(echo(X,4,6) ,12) +transpose((transpose(X,-5) +transpose((X|X) ,12) ) ,12) ) ) +echo(echo(X,4,6) ,4,6) ) ,12) ) +transpose(((arpeggio(echo(echo(X,4,6) ,4,6) ) |(step(((transpose((shuffle(X) |X) ,-7) +transpose(((X+transpose(X,12) ) |echo(X,4,6) ) ,4) ) +transpose((arpeggio((X+transpose(X,12) ) ) |transpose(X,4) ) ,7) ) ,12) +transpose(step(((arpeggio(X) +transpose(((X+transpose(step(X,12) ,4) ) +transpose(shuffle(X) ,7) ) ,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) ,12) ,12) ) ) +transpose(((((arpeggio(step(X,12) ) +transpose(transpose(((echo(X,4,6) |(echo(X,4,6) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(X+X) ) ,7) ) ) |(step(transpose(X,4) ,12) +transpose(arpeggio(transpose(X,-7) ) ,12) ) ) ,-5) ,4) ) +transpose(transpose(((step(X,12) +transpose(arpeggio(transpose(X,-5) ) ,12) ) +transpose((transpose((X+transpose(echo(X,4,6) ,7) ) ,-5) |(X+transpose(X,7) ) ) ,7) ) ,4) ,7) ) +transpose(step(((transpose(X,4) |X) +transpose(arpeggio((X|X) ) ,12) ) ,12) ,4) ) +transpose(((step(echo(transpose(X,-5) ,4,6) ,12) +transpose((((transpose(step(step(X,12) ,12) ,-5) +transpose(shuffle(((X|X) |X) ) ,7) ) +transpose(((transpose(X,4) +transpose(X,12) ) |step(step(X,12) ,12) ) ,4) ) +transpose(((transpose(arpeggio(X) ,4) +transpose(echo(shuffle(X) ,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) ,7) ) +transpose(shuffle((arpeggio(X) +(X+transpose(X,4) ) ) ) ,12) ) ,7) ) ,12) ) ,12) ) ,-7) +transpose((transpose((shuffle(transpose(step(X,12) ,-7) ) +echo(transpose((X|X) ,-5) ,4,6) ) ,-5) +transpose(arpeggio(transpose((transpose(arpeggio(arpeggio(X) ) ,4) +transpose(((step(((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-7) ) +transpose((X+transpose(X,7) ) ,12) ) ,12) +transpose(transpose(X,4) ,7) ) +transpose((step(arpeggio(shuffle(X) ) ,12) +transpose((arpeggio(X) +transpose(transpose(X,-7) ,7) ) ,7) ) ,12) ) ,7) ) ,-7) ) ,7) ) ,12) ) +transpose((((transpose((((X+transpose(X,12) ) +transpose(shuffle(X) ,12) ) +arpeggio(X) ) ,4) +transpose((echo(X,4,6) +transpose(transpose(step(arpeggio(X) ,12) ,-7) ,7) ) ,12) ) +transpose((shuffle(((step(transpose(transpose(X,4) ,-7) ,12) +transpose((X+echo(X,4,6) ) ,4) ) +transpose(shuffle(X) ,7) ) ) +((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) +transpose(X,12) ) +transpose(step(transpose(shuffle(transpose(X,4) ) ,4) ,12) ,4) ) +transpose(echo((((X+transpose(transpose(X,-5) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((step(X,12) +transpose(echo(X,4,6) ,7) ) ,12) ) ,4,6) ,7) ) ) ,7) ) +transpose(((((arpeggio(transpose(shuffle(((arpeggio(X) +echo((transpose(arpeggio(X) ,4) +transpose(X,12) ) ,4,6) ) +transpose(shuffle(step((X|X) ,12) ) ,7) ) ) ,4) ) +transpose(transpose((((X+transpose((X+transpose(X,12) ) ,12) ) +transpose(step(echo(arpeggio(shuffle(X) ) ,4,6) ,12) ,12) ) +transpose(echo(transpose(arpeggio(echo(X,4,6) ) ,4) ,4,6) ,7) ) ,-5) ,4) ) +transpose(step((echo(transpose(((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,4) ,4,6) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) +transpose(step(transpose(X,-7) ,12) ,4) ) +transpose((arpeggio(step((X+X) ,12) ) +arpeggio(arpeggio(X) ) ) ,7) ) ,12) ) ,12) ,7) ) +transpose((transpose(transpose((((arpeggio(X) +transpose((X+X) ,4) ) +transpose((X|X) ,7) ) +transpose(echo(shuffle(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4,6) ,7) ) ,4) ,4) +transpose(arpeggio(transpose((echo(arpeggio((X+transpose(X,12) ) ) ,4,6) +transpose((transpose((arpeggio(X) +transpose(echo(X,4,6) ,12) ) ,-5) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) ,12) ) ,-5) ) ,7) ) ,4) ) +transpose((((step(echo(echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(shuffle(X) ,12) ) ,7) ) ,4,6) ,4,6) ,12) +transpose(shuffle(((transpose(X,-7) +transpose(transpose(step((X|(X+transpose(X,12) ) ) ,12) ,4) ,12) ) |((transpose(X,-5) +transpose((X+transpose(X,7) ) ,12) ) |(X+transpose(step(X,12) ,7) ) ) ) ) ,4) ) +transpose(transpose(((shuffle(echo(((X+transpose(X,7) ) |transpose(X,4) ) ,4,6) ) +transpose(((step(X,12) +(((X+transpose(X,4) ) +transpose(X,7) ) |X) ) +transpose(((X+X) +X) ,12) ) ,12) ) |((((arpeggio(shuffle(transpose(X,-7) ) ) +transpose(((X|X) |((X+transpose((X+transpose(X,7) ) ,12) ) +transpose(X,12) ) ) ,4) ) +transpose((transpose(X,4) |((X|X) +X) ) ,7) ) +transpose(transpose(step(arpeggio(X) ,12) ,-5) ,4) ) +transpose(shuffle(echo(transpose(X,-7) ,4,6) ) ,7) ) ) ,-7) ,7) ) +transpose(step(arpeggio((echo(echo(shuffle(X) ,4,6) ,4,6) |((shuffle(X) +transpose((X+X) ,12) ) |(echo(transpose(X,-7) ,4,6) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ) ) ) ,12) ,12) ) ,7) ) ,12) ) ,4) ) +transpose((((((((X|transpose(shuffle((X+transpose(X,12) ) ) ,-7) ) +transpose(transpose((step(echo(transpose(X,-5) ,4,6) ,12) +transpose(((shuffle(transpose(transpose((X+transpose(X,7) ) ,-5) ,-7) ) +transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,4) ) +transpose(echo(step(transpose(step(X,12) ,-5) ,12) ,4,6) ,7) ) ,12) ) ,4) ,7) ) +transpose(transpose((echo(step(echo((X|X) ,4,6) ,12) ,4,6) +transpose(echo(step(X,12) ,4,6) ,7) ) ,-7) ,4) ) +transpose(shuffle(((X+X) +transpose((X+transpose(X,7) ) ,12) ) ) ,7) ) +transpose(((echo((((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose((((X|X) +transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4,6) +transpose(transpose((((X|X) +transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose((((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) ,12) ) ,-5) ,12) ) +transpose(arpeggio((((((step((X|arpeggio(shuffle(X) ) ) ,12) +transpose(((echo(arpeggio(X) ,4,6) +transpose(transpose((X+transpose(X,12) ) ,4) ,4) ) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,4) ) +transpose(((step(X,12) +transpose(step(X,12) ,12) ) +transpose(shuffle(((X+transpose(X,12) ) +transpose(X,12) ) ) ,12) ) ,7) ) +transpose(step(arpeggio(shuffle(step((X+transpose(X,7) ) ,12) ) ) ,12) ,4) ) +transpose(((((arpeggio(X) +transpose(transpose(X,-7) ,4) ) +transpose(step((X+transpose(X,7) ) ,12) ,7) ) +transpose(((transpose(X,-5) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,4) ) +transpose(((transpose(step(X,12) ,-5) +(echo(X,4,6) +transpose(X,7) ) ) +transpose(echo(transpose((X+transpose(X,12) ) ,-7) ,4,6) ,12) ) ,7) ) ,7) ) +transpose(transpose((X+transpose((step(X,12) +transpose((X|X) ,12) ) ,7) ) ,-7) ,7) ) ) ,12) ) ,12) ) +transpose(((arpeggio((shuffle((((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose((X|transpose(X,4) ) ,12) ) +transpose(shuffle(X) ,4) ) +transpose(((X+transpose(X,12) ) +transpose(transpose(X,4) ,7) ) ,7) ) ) +transpose(transpose(shuffle(echo(echo(X,4,6) ,4,6) ) ,-5) ,7) ) ) +transpose(arpeggio((arpeggio(echo(((transpose(step(X,12) ,4) +transpose(shuffle(arpeggio(echo(X,4,6) ) ) ,4) ) +transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,4,6) ) +transpose(transpose(((((arpeggio(X) +transpose(step(X,12) ,12) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) +transpose((transpose(X,-7) +transpose(X,12) ) ,12) ) +transpose(transpose((((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +echo(X,4,6) ) +transpose((step(echo(X,4,6) ,12) |(X|X) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-7) ,7) ) ,4) ,7) ) ) ,4) ) +transpose(echo((transpose(step((step(arpeggio(arpeggio((X|X) ) ) ,12) +transpose(transpose(X,-7) ,-5) ) ,12) ,4) +transpose(step(echo(arpeggio(((step(X,12) +transpose(arpeggio(X) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,7) ) ) ,4,6) ,12) ,12) ) ,4,6) ,7) ) ,4) ) +transpose(((transpose((transpose(arpeggio(shuffle((((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) +transpose((transpose((X+transpose(step(X,12) ,7) ) ,-5) |(((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) +(((X+transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ) ) ,12) ) ) ) ,-5) +transpose(echo(transpose(transpose(((X+transpose(X,12) ) |(echo(X,4,6) +transpose(shuffle(X) ,7) ) ) ,-5) ,-7) ,4,6) ,7) ) ,4) +transpose(step((step(transpose(X,4) ,12) +transpose(((step(transpose(X,4) ,12) +transpose((transpose((X+transpose(X,12) ) ,-7) +transpose(X,12) ) ,4) ) +transpose((transpose(transpose(X,4) ,-5) +X) ,7) ) ,7) ) ,12) ,4) ) +transpose(echo((((step((X+transpose(X,7) ) ,12) +transpose(step(step(transpose(step(X,12) ,-5) ,12) ,12) ,4) ) +transpose(echo((X|X) ,4,6) ,7) ) +transpose((((X+(X+transpose(arpeggio(X) ,12) ) ) +transpose((((X+X) +transpose(((transpose(X,-7) +transpose(X,7) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) ,4) ) +transpose(((X+transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,7) ) ,7) ) +transpose(echo((step(X,12) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,12) ) ,12) ) ,4,6) ,7) ) ,7) ) ,7) ) random seed used was 0

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