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 17 generations the expression "X" became this: (((((((step((echo(shuffle(transpose(X,-5) ) ,4,6) |transpose((transpose(X,-7) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) ,-5) ) ,12) |transpose(transpose(((transpose((X|X) ,-5) +transpose(arpeggio(X) ,12) ) |X) ,-5) ,4) ) +transpose(transpose(arpeggio(arpeggio(shuffle(((X+transpose(X,-7) ) |(transpose(X,4) +transpose(X,-7) ) ) ) ) ) ,-7) ,12) ) +transpose(transpose(transpose(shuffle(transpose(((X+transpose(X,12) ) +transpose(transpose(X,-7) ,7) ) ,-5) ) ,-7) ,-7) ,4) ) +transpose(arpeggio((transpose(echo(X,4,6) ,-5) +transpose((transpose(shuffle((transpose(transpose(transpose(X,4) ,-5) ,4) +transpose((((((X+transpose(X,12) ) +transpose(arpeggio(X) ,12) ) +transpose(((transpose(X,-7) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(X,-5) ,12) ) ,12) ) ) ,-7) +transpose(echo(transpose((transpose(transpose(X,-5) ,-7) +X) ,4) ,4,6) ,-5) ) ,7) ) ) ,7) ) +(transpose((X+(step(X,12) +echo((X+transpose(X,12) ) ,4,6) ) ) ,4) +transpose(shuffle(((echo((transpose((X+transpose(X,12) ) ,4) |transpose(X,4) ) ,4,6) +transpose(arpeggio(transpose(transpose(transpose(X,-7) ,4) ,4) ) ,4) ) +transpose(transpose(step(transpose(transpose(echo(X,4,6) ,-5) ,-7) ,12) ,-5) ,7) ) ) ,12) ) ) +transpose(echo(((echo(arpeggio(transpose(transpose(((transpose(X,-7) +X) |X) ,-7) ,-5) ) ,4,6) |echo(((transpose(transpose(X,-7) ,4) |transpose(X,4) ) +transpose(step((transpose(transpose(X,-5) ,4) |arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,12) ) ) ) ,12) ,12) ) ,4,6) ) +step(((transpose(transpose(X,-5) ,-7) +transpose((echo((echo(X,4,6) |step(X,12) ) ,4,6) +transpose(((X+transpose((X+X) ,12) ) |transpose(transpose(X,-5) ,4) ) ,7) ) ,4) ) +transpose((echo(transpose(X,4) ,4,6) +(((transpose((arpeggio(X) |shuffle(transpose(X,4) ) ) ,-5) +transpose(X,4) ) +transpose(shuffle(((X+(X+X) ) +transpose(transpose(X,-7) ,4) ) ) ,7) ) +transpose((((transpose(X,-5) +transpose(X,4) ) +transpose((X+X) ,7) ) +(step(X,12) +transpose(echo(X,4,6) ,7) ) ) ,4) ) ) ,7) ) ,12) ) ,4,6) ,7) ) +echo(transpose(echo(((((((transpose(transpose((X+transpose(X,7) ) ,4) ,-7) |transpose(X,-5) ) +transpose((((X|X) +(X+transpose(X,7) ) ) +transpose((X+transpose(X,7) ) ,-5) ) ,4) ) +transpose(shuffle(transpose(X,4) ) ,7) ) +transpose(((transpose((X+X) ,-5) +transpose(transpose((transpose(transpose(X,-7) ,4) +transpose(step(transpose(X,4) ,12) ,7) ) ,4) ,7) ) +transpose(((transpose(X,4) +transpose(transpose(arpeggio(X) ,4) ,12) ) +transpose(shuffle(((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,7) ) ,12) ) +transpose((((step(arpeggio((X|X) ) ,12) +transpose(((X+X) +transpose(transpose(X,-5) ,12) ) ,4) ) +transpose(transpose(shuffle((X|X) ) ,4) ,4) ) +transpose((transpose(transpose(arpeggio(X) ,4) ,-7) +transpose(X,-5) ) ,7) ) ,4) ) +transpose(((((shuffle(X) +(transpose(X,4) +transpose((X+X) ,7) ) ) +transpose(((arpeggio(shuffle(X) ) +shuffle((X+transpose(X,7) ) ) ) |(transpose(transpose(shuffle(X) ,-7) ,4) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ) ,4) ) +transpose((transpose(shuffle(shuffle(X) ) ,-5) +transpose(transpose(((X|X) |(arpeggio(X) |(X+X) ) ) ,-5) ,7) ) ,7) ) +transpose((step(transpose(transpose((X+X) ,-5) ,-5) ,12) |(echo(shuffle(X) ,4,6) +transpose((X+transpose((X+X) ,12) ) ,7) ) ) ,7) ) ,7) ) ,4,6) ,4) ,4,6) ) random seed used was 16 NOTE: Generated phrase was too large ( 5895 ) , it has been truncated at 5000 notes. EXPR = arpeggio(transpose(shuffle(transpose(transpose(((arpeggio(echo((transpose(X,4) +X) ,4,6) ) +transpose((echo(((transpose(((transpose(X,4) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) +(((X+X) +transpose(X,12) ) +(X+X) ) ) +(echo(X,4,6) +transpose(X,12) ) ) ,4,6) +transpose(step(transpose(transpose(shuffle(X) ,4) ,-5) ,12) ,12) ) ,7) ) +transpose(transpose((transpose(shuffle(transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,-7) ) ,4) +transpose(X,-7) ) ,-5) ,12) ) ,-5) ,-7) ) ,-5) ) random seed used was 0 EXPR = ((transpose((((transpose((transpose((((echo(transpose(X,-7) ,4,6) +transpose(transpose((X+X) ,-7) ,12) ) +transpose(((X+transpose((X|X) ,7) ) +(X+transpose(X,12) ) ) ,4) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ,-5) +transpose((step((arpeggio((X+X) ) |(X+X) ) ,12) |((X+transpose(X,12) ) |(X+transpose(X,12) ) ) ) ,12) ) ,-5) +transpose(transpose(transpose(arpeggio(transpose((shuffle(transpose(X,4) ) +((X|shuffle(X) ) +shuffle(X) ) ) ,4) ) ,4) ,4) ,12) ) |transpose(((transpose(echo((X+X) ,4,6) ,4) +transpose(echo(((X|transpose((X+X) ,-5) ) +transpose(shuffle((X|X) ) ,12) ) ,4,6) ,12) ) +shuffle((X|X) ) ) ,4) ) +(((arpeggio(((((step(X,12) +(transpose(X,4) +transpose((X|X) ,7) ) ) |(X+X) ) +transpose(transpose(shuffle(X) ,4) ,12) ) +transpose((((((X+transpose(X,12) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) |(X+transpose(X,12) ) ) +transpose(((((arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ) +transpose(X,7) ) +transpose(step((X+(shuffle(X) +transpose((X+X) ,12) ) ) ,12) ,4) ) +transpose(step((transpose(X,-5) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,7) ) ,12) ) ,7) ) ) |((echo(transpose(step(transpose(X,4) ,12) ,-5) ,4,6) +echo(((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4) +transpose(arpeggio(shuffle(X) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4,6) ) |transpose((transpose(transpose(transpose(X,4) ,-5) ,4) +arpeggio(step((transpose(X,-5) +X) ,12) ) ) ,4) ) ) |arpeggio(echo((arpeggio((step(X,12) |X) ) +transpose(transpose(arpeggio((X+transpose(X,12) ) ) ,-7) ,7) ) ,4,6) ) ) +(((step(transpose(((echo(X,4,6) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,12) ) ,-7) ,12) +transpose(transpose((transpose(transpose(X,-5) ,4) +transpose(((X|X) +X) ,-7) ) ,-7) ,4) ) +transpose(transpose(transpose((echo(X,4,6) +transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,7) ) ,4) ,4) ,7) ) |shuffle(((step((transpose(transpose(transpose(echo((X+transpose(X,12) ) ,4,6) ,-7) ,-5) ,-5) +echo(transpose((X+X) ,4) ,4,6) ) ,12) +transpose((((arpeggio(X) +transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) ,12) ) +transpose(transpose(shuffle(X) ,4) ,7) ) |((step(transpose(X,4) ,12) +transpose(transpose(transpose((X|X) ,4) ,-7) ,4) ) +transpose(arpeggio(transpose((shuffle(X) |X) ,4) ) ,7) ) ) ,4) ) +transpose((((transpose(X,-7) +transpose(transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,-7) ,7) ) +((((X|X) +transpose(((X+transpose(transpose(X,4) ,4) ) +transpose((X+X) ,7) ) ,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,4) ,7) ) ) +transpose(transpose((((X+transpose(X,7) ) |(X+transpose(X,7) ) ) |X) ,-5) ,12) ) ,7) ) ) ) ) ) ,-7) +transpose((arpeggio(transpose(transpose(((((transpose((transpose(X,4) |step(X,12) ) ,-5) +transpose(transpose(transpose((arpeggio(arpeggio(X) ) +transpose(shuffle(X) ,12) ) ,4) ,-7) ,12) ) +transpose((shuffle(transpose(((X|(X+X) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ,-5) ) +transpose(((transpose((X|X) ,4) |step(((transpose(X,-5) +shuffle(X) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-5) ) ,7) ) ,12) ) +transpose(((((transpose(X,-7) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) |(((X+transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose((echo(X,4,6) +transpose((X+X) ,12) ) ,7) ) ) +transpose(X,7) ) ,7) ) ,7) ) ,4) ) +transpose((echo(((transpose(X,-7) +transpose(X,7) ) +(transpose(X,4) +transpose(((X+transpose(X,7) ) |(X+transpose(X,12) ) ) ,7) ) ) ,4,6) |transpose(((arpeggio(transpose((X+X) ,4) ) +transpose(step(transpose(transpose(arpeggio(X) ,4) ,-7) ,12) ,4) ) +transpose(transpose(transpose(((X+X) +transpose(X,7) ) ,-7) ,-7) ,7) ) ,4) ) ,7) ) +transpose(transpose(transpose(transpose(transpose(transpose(X,-5) ,-5) ,-5) ,-7) ,-5) ,-5) ) ,4) ,-7) ) +(transpose(transpose(transpose((((transpose(((((arpeggio(X) +transpose((X+X) ,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) +transpose(arpeggio((echo(X,4,6) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ) ,12) ) +transpose(transpose(transpose(transpose((transpose(X,-7) +transpose((X+transpose(X,12) ) ,7) ) ,4) ,4) ,-7) ,4) ) +transpose(((transpose(X,-5) +echo(transpose((X+X) ,-7) ,4,6) ) +transpose(transpose(((X+X) +(transpose(X,-7) |(X+X) ) ) ,-7) ,12) ) ,7) ) ,-7) ,4) ,-7) +transpose(echo(transpose(step(((((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose((X+X) ,4) ) +(shuffle(shuffle(X) ) +transpose(arpeggio(arpeggio(X) ) ,7) ) ) ,12) ,-5) ,4,6) ,7) ) ) ,4) ) +transpose(echo(((transpose(transpose(shuffle(transpose((transpose(transpose((X+transpose(X,7) ) ,4) ,-7) +((X+transpose(X,12) ) +(X+X) ) ) ,-5) ) ,4) ,-7) +transpose(transpose(arpeggio((transpose(((X+transpose((X+transpose(X,12) ) ,4) ) |transpose((X+transpose(X,12) ) ,4) ) ,4) +((((X+transpose((X|X) ,7) ) +transpose((X+transpose(X,-7) ) ,7) ) +transpose(((transpose((transpose(X,4) |X) ,4) +transpose(((X+transpose(transpose(X,-5) ,12) ) +echo(transpose(X,-5) ,4,6) ) ,4) ) +transpose(shuffle((X|X) ) ,7) ) ,4) ) +transpose(((arpeggio(X) +X) +transpose(X,-7) ) ,7) ) ) ) ,-5) ,4) ) +transpose(step(echo(transpose(transpose(arpeggio(transpose(transpose(X,4) ,-7) ) ,4) ,4) ,4,6) ,12) ,7) ) ,4,6) ,7) ) random seed used was 0 EXPR = arpeggio(((echo(step((transpose((transpose(arpeggio(transpose(step(transpose(transpose(X,4) ,-7) ,12) ,-7) ) ,-5) |transpose((transpose(((transpose(transpose(transpose(X,-7) ,-5) ,-7) +transpose(((X|X) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) +transpose(((transpose(((X|arpeggio(X) ) |((X+transpose((X|X) ,4) ) +transpose(X,7) ) ) ,-7) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) ) +transpose(((transpose(((step(X,12) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,-7) +transpose(transpose(arpeggio(X) ,-7) ,4) ) +X) ,7) ) ,7) ) ,-5) ) ,4) |(transpose(transpose(transpose(echo(echo(arpeggio(((shuffle(X) +transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,4,6) ,-7) ,4) ,-7) +transpose(shuffle(shuffle(shuffle((((((echo(X,4,6) +transpose(transpose(X,-5) ,4) ) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) +(echo((X|X) ,4,6) |arpeggio(transpose(X,4) ) ) ) |transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-7) ) +transpose(shuffle((((transpose(X,4) |transpose(X,-7) ) +transpose((X+transpose(step(X,12) ,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,7) ) ) ) ) ,12) ) ) ,12) ,4,6) +transpose(transpose((echo(transpose(transpose(transpose(transpose((transpose((transpose((X|X) ,4) +transpose((arpeggio(transpose(X,-5) ) +X) ,12) ) ,4) +(((((X+transpose(X,12) ) |(X+X) ) +transpose(step((shuffle(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ,7) ) +transpose(X,4) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) ) ,-5) ,4) ,-7) ,-5) ,4,6) |step(((echo((shuffle(transpose(step(X,12) ,4) ) +transpose(transpose(echo(X,4,6) ,-7) ,-5) ) ,4,6) +transpose((shuffle(((X|X) +transpose(X,4) ) ) |transpose((((((X|X) +(X+transpose(X,12) ) ) +transpose(transpose(X,4) ,4) ) +transpose((X|transpose(X,-7) ) ,7) ) |(shuffle(X) +transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose(shuffle(X) ,7) ) ,12) ) ) ,-5) ) ,12) ) +((echo(((step((X|X) ,12) +transpose((transpose(X,4) |echo(step(X,12) ,4,6) ) ,12) ) |transpose(arpeggio(echo((X+transpose((X+X) ,7) ) ,4,6) ) ,-5) ) ,4,6) +transpose(echo(arpeggio((((X|(X|X) ) +(((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,12) ) ) ) +echo(shuffle(X) ,4,6) ) ) ,4,6) ,7) ) +transpose(arpeggio(transpose(((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(((X+X) +X) ,7) ) +transpose(((((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(shuffle(transpose(X,-7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ,-7) ) ,12) ) ) ,12) ) ,-7) ,4) ) +transpose((((((transpose(((X|X) +transpose(X,-7) ) ,-5) |(((transpose(X,-5) +transpose(transpose(X,-5) ,7) ) +transpose(step((arpeggio(X) |step(X,12) ) ,12) ,12) ) |transpose(X,-5) ) ) +transpose(transpose((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(((step(X,12) +transpose(X,12) ) +transpose((transpose(X,-7) +transpose((X+transpose(X,7) ) ,12) ) ,12) ) ,12) ) ,4) ,12) ) |transpose((transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +(echo(X,4,6) |step(X,12) ) ) +transpose(((transpose(transpose(X,-5) ,-5) |(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +(((X+transpose(X,4) ) +transpose(X,7) ) +X) ) ) +transpose(transpose((echo((X+X) ,4,6) |((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,4) ,12) ) ,12) ) ,4) |(transpose((((arpeggio(X) +transpose(shuffle(X) ,12) ) +transpose(X,4) ) +(transpose(transpose(X,4) ,-5) +transpose((((X|((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((transpose(X,-7) +(X+X) ) ,7) ) |((X|X) |(X+transpose(X,7) ) ) ) ,7) ) ) ,-5) |((step(((X+X) +transpose(X,12) ) ,12) |(step(((X|X) +(transpose(X,-7) +echo(X,4,6) ) ) ,12) +(transpose(echo(X,4,6) ,4) +transpose(transpose((X+X) ,-5) ,7) ) ) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,7) ) ) +transpose(echo(X,4,6) ,12) ) ,-5) ) ) ) ,4) ) +transpose((transpose((((((arpeggio(transpose(X,-7) ) +transpose((((((X+transpose(X,7) ) +echo(X,4,6) ) +transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,7) ) +(step(X,12) +X) ) |transpose(step(echo(X,4,6) ,12) ,-7) ) ,4) ) +transpose(arpeggio(transpose((X+transpose(X,7) ) ,-5) ) ,7) ) +transpose(((transpose((transpose(transpose(X,-7) ,4) +transpose(step(step(X,12) ,12) ,4) ) ,-5) +transpose(step(shuffle(X) ,12) ,12) ) |step(echo(echo(transpose(X,-7) ,4,6) ,4,6) ,12) ) ,4) ) +transpose(transpose((shuffle(((X+transpose(step(arpeggio(X) ,12) ,4) ) +transpose(shuffle(X) ,7) ) ) |shuffle(X) ) ,-7) ,7) ) +(((echo(transpose(X,-7) ,4,6) |transpose(X,4) ) +transpose(((((step(transpose(X,-7) ,12) +transpose(arpeggio(step(((X+X) +transpose((X+transpose(X,12) ) ,12) ) ,12) ) ,7) ) +transpose((transpose(X,-7) |X) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) |(arpeggio((step((X+transpose(X,7) ) ,12) +transpose(echo(X,4,6) ,7) ) ) |transpose(transpose(X,-5) ,4) ) ) ,4) ) +transpose((((echo(echo(transpose(X,4) ,4,6) ,4,6) +transpose(shuffle(((transpose((X+X) ,4) +transpose((X+(X|X) ) ,4) ) +transpose(step((X+X) ,12) ,7) ) ) ,4) ) +transpose((X+transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ) ,7) ) |((step(transpose(transpose(X,-5) ,4) ,12) +transpose((step(transpose(X,-7) ,12) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) +(((X+transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) +(X|transpose(X,4) ) ) ) ) ,7) ) ) ,4) +transpose((((transpose(echo((echo((X+X) ,4,6) +(step(X,12) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4,6) ,-5) |(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-7) +transpose((((arpeggio((arpeggio(X) +transpose(transpose(X,-7) ,7) ) ) |transpose(transpose(X,-5) ,-5) ) +transpose((((arpeggio(transpose(X,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) ) +echo(X,4,6) ) +transpose(echo(transpose(arpeggio(X) ,-7) ,4,6) ,7) ) ,4) ) +transpose(((((X+X) +transpose((X+transpose(X,-5) ) ,4) ) +transpose(arpeggio(X) ,7) ) +echo((((X+X) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,4,6) ) ,7) ) ,-7) ) ) +transpose(transpose(transpose(((shuffle(X) +(echo((X|X) ,4,6) |((X|X) +transpose(X,4) ) ) ) |((((X+X) +transpose((X|X) ,4) ) +transpose(((X+transpose(step(X,12) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) +transpose((arpeggio((X|X) ) |transpose(X,-7) ) ,7) ) ) ,-5) ,4) ,4) ) +transpose(transpose(transpose(transpose((transpose(transpose(transpose(X,4) ,-5) ,-7) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ,-5) ,4) ,-5) ,7) ) ,7) ) ,7) ) |transpose(((((transpose(shuffle(arpeggio((transpose(X,-5) +(X+transpose(X,7) ) ) ) ) ,4) +transpose((transpose(transpose(X,-5) ,-5) +transpose(echo((transpose(transpose(((X+transpose(((transpose(X,4) +transpose((X+X) ,4) ) +transpose(X,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ,4) +transpose((((arpeggio((X+X) ) |(X+transpose((arpeggio(X) +X) ,7) ) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4) ,4) ) +transpose((transpose(step(X,12) ,-7) +transpose(step(arpeggio(X) ,12) ,12) ) ,7) ) ,12) ) ,4,6) ,7) ) ,-5) ) +transpose(transpose((transpose(shuffle((X+transpose(X,7) ) ) ,4) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +X) +transpose(X,-5) ) ,12) ) ,-7) ,-5) ) +transpose(transpose(((((((X+transpose(X,12) ) +(X+echo(X,4,6) ) ) +transpose(X,4) ) +transpose(((transpose((X+transpose(X,12) ) ,-7) +transpose((X+step(X,12) ) ,4) ) +transpose(X,7) ) ,12) ) +transpose((shuffle((transpose(((echo(X,4,6) +transpose(transpose(X,4) ,4) ) +transpose(step(X,12) ,7) ) ,4) |(X+transpose((X+transpose(X,12) ) ,7) ) ) ) +((((X+X) +transpose(shuffle((X+transpose(X,7) ) ) ,12) ) +transpose(echo(step(X,12) ,4,6) ,4) ) +transpose((transpose(X,-7) |arpeggio(X) ) ,7) ) ) ,12) ) +transpose(transpose((transpose(echo(transpose(shuffle((X+X) ) ,-5) ,4,6) ,-5) +arpeggio(step(transpose(X,-5) ,12) ) ) ,-7) ,7) ) ,-5) ,4) ) +transpose((shuffle(((transpose(transpose(arpeggio(X) ,-7) ,-7) |(((X+X) +transpose(((X+transpose(X,7) ) +X) ,12) ) +((X+transpose(X,-7) ) +arpeggio(X) ) ) ) +echo(transpose((transpose(transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ,-7) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |echo(transpose(X,-7) ,4,6) ) ,7) ) ,-5) ,4,6) ) ) |transpose(step(arpeggio(((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +arpeggio(echo(X,4,6) ) ) |((arpeggio(X) +transpose(X,12) ) +transpose((((X|X) +transpose(step(X,12) ,4) ) +transpose(transpose(X,4) ,7) ) ,12) ) ) +transpose((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) ,4) ) +transpose(((transpose(X,4) |transpose(transpose(X,-7) ,-5) ) +arpeggio((X+transpose(X,7) ) ) ) ,7) ) ) ,12) ,-7) ) ,7) ) ,-7) ) ,7) ) ) random seed used was 0

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