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!
 Do you like this result? Do you want to let other people listen to it? Save this one in theTune Trove! See what's alreadyin the Tune Trove!

 After 20 generations the expression "X" became this: ((transpose((((transpose(arpeggio(transpose(arpeggio((transpose(echo((shuffle(X) +(echo((transpose(X,-5) +X) ,4,6) |shuffle(X) ) ) ,4,6) ,-7) |echo(step(transpose(transpose(transpose(X,4) ,-7) ,-5) ,12) ,4,6) ) ) ,-7) ) ,-7) +transpose(((transpose(transpose(shuffle(((step((X+((echo(X,4,6) +transpose(X,4) ) +transpose(X,7) ) ) ,12) +transpose(echo(transpose(X,-7) ,4,6) ,4) ) +transpose(step(step(transpose(X,4) ,12) ,12) ,7) ) ) ,4) ,-5) |transpose(((transpose((X+transpose(X,-7) ) ,4) +transpose(echo(X,4,6) ,-5) ) +transpose((transpose((X|X) ,-5) |transpose(((X+transpose(X,12) ) |transpose(X,4) ) ,-7) ) ,12) ) ,4) ) +(shuffle(((X+transpose(X,12) ) +(X+X) ) ) |(echo(transpose(transpose((shuffle(transpose(echo((transpose(X,4) |transpose(X,4) ) ,4,6) ,-5) ) +arpeggio(transpose(X,-7) ) ) ,4) ,-7) ,4,6) |echo((X+X) ,4,6) ) ) ) ,4) ) +transpose(shuffle((((transpose(arpeggio(transpose((transpose(((transpose(X,-5) +transpose((transpose(X,-7) +X) ,12) ) |(X+X) ) ,-5) +transpose((X+X) ,12) ) ,-7) ) ,4) +transpose((transpose(transpose(transpose(step(arpeggio(((transpose(X,4) +transpose(((X+X) |X) ,12) ) +(transpose(X,-5) +X) ) ) ,12) ,4) ,4) ,4) |echo(arpeggio((((X+transpose(X,4) ) +transpose(transpose(step(X,12) ,4) ,12) ) |transpose(X,-5) ) ) ,4,6) ) ,12) ) +(((transpose(arpeggio(shuffle(transpose((X+transpose(X,12) ) ,-7) ) ) ,4) |((transpose(((X+transpose(X,12) ) +transpose(echo(X,4,6) ,7) ) ,4) +transpose(echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ,4,6) ,12) ) |((step(step(X,12) ,12) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ) ) |transpose(((((transpose((X+transpose(X,7) ) ,-7) +transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,7) ) +transpose((transpose(transpose(X,-7) ,-7) |(transpose(X,4) +transpose(X,-7) ) ) ,7) ) +transpose((transpose(transpose(transpose(X,-5) ,-5) ,-7) +(transpose(X,4) +transpose(transpose(X,-5) ,12) ) ) ,7) ) |transpose(X,4) ) ,4) ) +transpose(transpose((((((echo(echo(transpose(step(X,12) ,-5) ,4,6) ,4,6) |transpose(transpose(step((X+transpose(X,12) ) ,12) ,-5) ,-7) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,-7) ) +transpose((echo((transpose(X,-5) +(X+transpose(X,12) ) ) ,4,6) +transpose((((X+transpose(X,7) ) +transpose((transpose(X,-5) +transpose(X,12) ) ,7) ) +transpose(shuffle((arpeggio(X) +transpose((X+transpose(X,7) ) ,12) ) ) ,12) ) ,7) ) ,4) ) +transpose(step(transpose(transpose((X+transpose(X,12) ) ,-7) ,-7) ,12) ,7) ) +transpose((transpose(transpose(transpose(transpose(X,-5) ,-5) ,-5) ,-7) |(step(transpose(transpose(step((X+transpose(X,12) ) ,12) ,4) ,4) ,12) +transpose((shuffle(transpose(transpose(X,-7) ,-5) ) +transpose(((((X+transpose(X,12) ) +transpose((transpose(X,-7) +transpose(X,7) ) ,12) ) +transpose(shuffle((transpose(X,-5) +transpose((X+X) ,12) ) ) ,12) ) +step(transpose((X+transpose(X,7) ) ,4) ,12) ) ,7) ) ,12) ) ) ,12) ) ,4) ,7) ) ) +transpose((step(((transpose(X,4) +transpose(arpeggio((transpose(X,4) +transpose(arpeggio(X) ,12) ) ) ,4) ) +transpose(transpose((arpeggio(echo(transpose(transpose(X,-5) ,-5) ,4,6) ) +transpose(transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,-5) ,12) ) ,-5) ,7) ) ,12) +transpose(step((((((transpose(echo((transpose(transpose(transpose(X,4) ,-5) ,4) |(transpose(X,-7) +X) ) ,4,6) ,-7) +transpose((transpose(X,-5) +(X+transpose(echo(X,4,6) ,12) ) ) ,-7) ) +transpose(transpose(step((((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) +echo((shuffle(arpeggio(X) ) +(X+transpose(X,12) ) ) ,4,6) ) ,12) ,4) ,4) ) +transpose(shuffle((transpose((shuffle(transpose(X,4) ) |(X+(X|X) ) ) ,-5) +transpose((transpose((X+transpose(X,7) ) ,4) +transpose(transpose((X|X) ,-7) ,12) ) ,7) ) ) ,7) ) +transpose((transpose((((transpose(echo(X,4,6) ,4) +(transpose(X,-5) +X) ) +transpose((X+X) ,12) ) +transpose(transpose((X|transpose(X,-5) ) ,-7) ,4) ) ,4) +transpose(echo(shuffle(transpose((echo((X+X) ,4,6) |((X|X) +((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) ) ) ,4) ) ,4,6) ,7) ) ,4) ) +transpose(transpose((transpose(((transpose(transpose(X,-5) ,4) +X) +transpose(X,12) ) ,-7) |transpose(echo((transpose(X,-7) |X) ,4,6) ,-7) ) ,4) ,7) ) ,12) ,4) ) ,7) ) ) ,4) ) +transpose((shuffle(transpose(transpose((transpose(transpose(((transpose(transpose(transpose(transpose(X,-5) ,-5) ,-5) ,-5) +transpose(((transpose((arpeggio(X) +X) ,4) +transpose(arpeggio((transpose((X+transpose(X,-5) ) ,4) |transpose((transpose(X,-7) +transpose(X,7) ) ,-5) ) ) ,4) ) +transpose(transpose(transpose(step(arpeggio(X) ,12) ,-7) ,4) ,7) ) ,4) ) +transpose((transpose(((((X+transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose((step(X,12) +(X+transpose(X,12) ) ) ,4) ) +transpose(((X+transpose(X,12) ) +transpose(X,-7) ) ,7) ) ,-5) +transpose(shuffle(transpose(((step(X,12) +transpose((transpose(X,-5) +transpose(arpeggio(X) ,12) ) ,4) ) +transpose(step(shuffle(X) ,12) ,7) ) ,-7) ) ,12) ) ,7) ) ,4) ,-7) +(transpose(((transpose(X,-7) |(X+transpose(X,12) ) ) +transpose(transpose((transpose(X,4) +transpose(((X+transpose((X|X) ,4) ) +transpose(X,7) ) ,7) ) ,4) ,12) ) ,-5) +transpose(transpose(transpose((((X|X) |(transpose(X,4) +X) ) +(((X+transpose(X,4) ) +transpose(X,7) ) +(X+transpose(X,12) ) ) ) ,4) ,4) ,7) ) ) ,4) ,-7) ) |transpose((((transpose(echo((echo((((X+transpose(X,12) ) +transpose(arpeggio(shuffle(X) ) ,4) ) +transpose((echo((X+transpose(X,12) ) ,4,6) +(transpose(X,4) +(X|X) ) ) ,7) ) ,4,6) +transpose(((((transpose(X,4) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(arpeggio(X) ,4) ,7) ) +transpose(shuffle(transpose(X,-5) ) ,12) ) ,12) ) ,4,6) ,4) +(shuffle((transpose(transpose((((X|X) +transpose(transpose(X,-7) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ,-7) ,4) |(step((((X+X) +(X+transpose(X,12) ) ) |(X|X) ) ,12) +X) ) ) +transpose(arpeggio(((((shuffle(transpose(X,-5) ) +transpose((X+transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) |(shuffle(X) |arpeggio(X) ) ) ,12) ) ,4) ) +transpose(transpose(arpeggio((X+X) ) ,-7) ,7) ) +(transpose(((X|X) +transpose(X,7) ) ,4) +transpose((X|X) ,12) ) ) +(((transpose((echo(X,4,6) +transpose((X+X) ,7) ) ,-5) |(transpose(echo(X,4,6) ,-7) |transpose(X,-5) ) ) |transpose(X,-7) ) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(transpose(X,4) ) ,7) ) ) ) ) ,12) ) ) +transpose(transpose((shuffle(echo(transpose(X,-7) ,4,6) ) +transpose(((X+transpose(transpose(echo(X,4,6) ,-5) ,7) ) +transpose(((transpose((X+transpose(X,7) ) ,4) +transpose((X+transpose(X,7) ) ,-5) ) |step(step((X+X) ,12) ,12) ) ,12) ) ,12) ) ,4) ,12) ) +transpose(transpose(transpose((transpose((((arpeggio((echo(X,4,6) +transpose(X,12) ) ) +transpose(shuffle(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,4) ) +transpose((((X+transpose(step(X,12) ,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) |(transpose(X,-5) +transpose((transpose(X,4) +transpose(X,4) ) ,7) ) ) ,7) ) |(((((X+transpose(X,7) ) +transpose((echo(X,4,6) +(X|transpose(X,4) ) ) ,4) ) +transpose((X+((X+transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ) ,7) ) +transpose(transpose((((X|X) +transpose(echo(X,4,6) ,4) ) +transpose((X|X) ,7) ) ,-7) ,4) ) +transpose(X,7) ) ) ,-5) +transpose((arpeggio((transpose(arpeggio(X) ,4) +transpose(X,7) ) ) +transpose(transpose(shuffle(X) ,-5) ,12) ) ,12) ) ,-7) ,4) ,12) ) ,4) ) ,7) ) ,-5) +transpose(transpose(transpose((transpose(((((transpose(transpose(transpose(shuffle(transpose(X,4) ) ,-5) ,4) ,-5) +transpose((transpose(shuffle(X) ,-7) +transpose(shuffle(transpose(shuffle(transpose(X,4) ) ,-7) ) ,7) ) ,-5) ) +((transpose(((((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(shuffle(X) ,7) ) +transpose((echo(transpose(X,4) ,4,6) +shuffle(shuffle(X) ) ) ,7) ) +transpose((step((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +(X+transpose(X,7) ) ) ,12) +transpose(((X|X) |shuffle(X) ) ,-7) ) ,7) ) +transpose((arpeggio((step(transpose(X,4) ,12) +(X+transpose(X,7) ) ) ) |transpose((step(echo(X,4,6) ,12) +(step(X,12) |(X+transpose(X,12) ) ) ) ,4) ) ,4) ) +transpose(transpose((((X+transpose((X+X) ,4) ) +transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +((arpeggio(X) +transpose(shuffle((X+X) ) ,4) ) +transpose(shuffle(arpeggio(X) ) ,7) ) ) ,4) ,7) ) +transpose((transpose(((X|X) +(((X+transpose(X,4) ) +transpose(X,7) ) |X) ) ,4) +transpose(transpose(arpeggio(transpose((X+X) ,-5) ) ,4) ,12) ) ,12) ) ,4) |arpeggio(transpose(((((((X|X) |X) +transpose(arpeggio(X) ,7) ) +transpose(step(transpose(step(X,12) ,4) ,12) ,4) ) +transpose(echo(step(X,12) ,4,6) ,7) ) +transpose(shuffle(shuffle((X+transpose((X+transpose(X,12) ) ,7) ) ) ) ,12) ) ,4) ) ) +transpose(step(transpose(((arpeggio((X+transpose(X,12) ) ) +transpose((((arpeggio(X) +transpose((shuffle(X) +transpose(transpose(X,4) ,12) ) ,12) ) +(arpeggio(X) +transpose(X,4) ) ) +(X+transpose(echo(X,4,6) ,7) ) ) ,4) ) +transpose(echo((X+transpose(((X+transpose(X,12) ) +transpose((X|X) ,7) ) ,12) ) ,4,6) ,7) ) ,-7) ,12) ,7) ) ) +transpose((((echo((transpose(transpose(transpose(transpose(X,-5) ,4) ,-7) ,-5) |transpose(((((X|transpose(X,4) ) +transpose((transpose(arpeggio(X) ,4) +transpose((X+X) ,-5) ) ,4) ) +transpose((X+transpose(transpose(transpose(X,-7) ,4) ,7) ) ,7) ) +transpose(transpose((X|X) ,4) ,12) ) ,4) ) ,4,6) +shuffle((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,7) ) ,4) +transpose(((arpeggio((step(X,12) |transpose(X,4) ) ) +X) +transpose(((shuffle((X+X) ) +transpose((X+X) ,12) ) +transpose((transpose(transpose(X,4) ,-5) |(X+(transpose(X,-5) |shuffle(X) ) ) ) ,12) ) ,12) ) ,12) ) ) ) +shuffle(echo(echo(echo(((X+transpose(transpose(X,-7) ,7) ) +(X+transpose(X,12) ) ) ,4,6) ,4,6) ,4,6) ) ) |transpose((arpeggio((((X+transpose((X+X) ,7) ) +transpose(((X+X) +transpose(((arpeggio(X) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose((echo((X|X) ,4,6) +transpose((step(X,12) +echo(X,4,6) ) ,7) ) ,7) ) ) |transpose((transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,-5) +transpose(arpeggio(step((transpose(X,4) |X) ,12) ) ,7) ) ,4) ) ,-5) ) ,4) ) +transpose((transpose(transpose(transpose((shuffle(arpeggio(transpose(echo(step((X+transpose(X,12) ) ,12) ,4,6) ,-5) ) ) +transpose((transpose(transpose(X,4) ,4) +transpose(shuffle(shuffle(arpeggio((transpose(X,-7) |echo(X,4,6) ) ) ) ) ,7) ) ,12) ) ,4) ,-7) ,-7) |transpose(transpose(transpose((X+X) ,4) ,-7) ,-5) ) ,7) ) ,4) |transpose(step((transpose(echo(transpose((((X+transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,4) ,4,6) ,4) +(transpose((((X+transpose(X,12) ) +transpose(transpose(X,4) ,4) ) +transpose((X|X) ,7) ) ,-7) +transpose(((((transpose(X,-5) +transpose((transpose(transpose(X,4) ,-5) +transpose((transpose(X,4) +transpose(transpose(X,4) ,7) ) ,12) ) ,4) ) +transpose(transpose(((X+X) +transpose(X,12) ) ,-7) ,7) ) +transpose(transpose(transpose(step(transpose(((X|X) +transpose((X+X) ,7) ) ,-5) ,12) ,-5) ,4) ,7) ) |((transpose((step(arpeggio(X) ,12) +transpose(arpeggio((transpose(X,-5) +transpose(transpose(X,4) ,7) ) ) ,12) ) ,-7) +transpose(arpeggio(X) ,4) ) +transpose(step(step(transpose((transpose(X,-5) |X) ,-7) ,12) ,12) ,7) ) ) ,7) ) ) ,12) ,-5) ) ,4) ,-7) ,4) ) +transpose(step(echo(echo(((step((echo(echo((transpose(((((X+X) +transpose(X,7) ) +(transpose(X,-5) +(X|X) ) ) |transpose((transpose(X,-5) |transpose(X,-5) ) ,4) ) ,-5) +shuffle((transpose(((X+X) |arpeggio(X) ) ,-7) +transpose(transpose(transpose(X,4) ,4) ,7) ) ) ) ,4,6) ,4,6) +((((transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) |((X+echo(X,4,6) ) |transpose((X|X) ,-7) ) ) |((echo(transpose(((X+X) +X) ,-5) ,4,6) +transpose(transpose(step(echo(transpose(X,4) ,4,6) ,12) ,-7) ,12) ) +arpeggio(echo((X|X) ,4,6) ) ) ) |echo(echo(shuffle(transpose((transpose((X+transpose(X,12) ) ,-5) +transpose((X+transpose(X,-5) ) ,12) ) ,4) ) ,4,6) ,4,6) ) +transpose(transpose((transpose((X+transpose(echo(X,4,6) ,4) ) ,4) +((transpose(step(transpose(X,-5) ,12) ,-7) +transpose(((transpose(transpose(X,4) ,-7) +transpose((X+transpose(X,-7) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +((X+X) +shuffle(X) ) ) ,7) ) ,12) ) +transpose((((transpose((X+X) ,-7) |transpose((X+transpose(X,12) ) ,-7) ) +transpose(((X+((X+transpose(X,4) ) +transpose(X,7) ) ) |(((X|X) +transpose((X|X) ,4) ) +transpose((X+X) ,7) ) ) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) ,-5) ) ) ,-5) ,7) ) ) ,12) +transpose((((transpose(((echo(transpose(X,4) ,4,6) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) +transpose(transpose((((((X+X) +arpeggio(X) ) +shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose((transpose(((X|X) +(X+transpose(X,7) ) ) ,-5) |arpeggio(echo(X,4,6) ) ) ,4) ) +transpose((step(X,12) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) ,7) ) ,-7) ,12) ) ,-5) +transpose(((transpose(echo(((arpeggio(echo((X+X) ,4,6) ) +transpose(arpeggio(step(echo((X+X) ,4,6) ,12) ) ,4) ) +transpose((transpose(transpose(((echo(X,4,6) +transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,7) ) +transpose(transpose((X|X) ,-5) ,7) ) ,-7) ,-7) +transpose((transpose((X+X) ,4) +X) ,-7) ) ,7) ) ,4,6) ,4) +transpose(transpose(transpose((((((step(X,12) +X) +((transpose(arpeggio(X) ,4) +transpose(transpose((X|X) ,-7) ,4) ) +transpose(transpose(X,4) ,7) ) ) |(((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) +transpose((transpose(X,-5) +transpose(X,-7) ) ,7) ) ) +(transpose(X,-5) +((arpeggio(echo(X,4,6) ) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ) ) |echo(transpose(transpose(X,-5) ,-7) ,4,6) ) ,-7) ,4) ,4) ) +transpose(((((step(((X+transpose(X,12) ) +transpose(arpeggio(X) ,12) ) ,12) +transpose((((X+transpose(X,7) ) +transpose(X,7) ) +transpose(transpose(X,4) ,-5) ) ,12) ) |transpose(step(echo(X,4,6) ,12) ,-7) ) |transpose(((X+transpose(X,-5) ) +transpose(transpose(transpose(shuffle(X) ,4) ,-5) ,4) ) ,4) ) +transpose(transpose((transpose((shuffle((X+transpose((X|X) ,7) ) ) +transpose(((transpose(X,-5) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,4) ) ,-7) +transpose(transpose((transpose(transpose(((echo(X,4,6) |((X+transpose(X,4) ) +transpose(X,7) ) ) |(X+transpose(X,12) ) ) ,-5) ,-5) +transpose(echo(transpose(echo(X,4,6) ,-5) ,4,6) ,12) ) ,-7) ,7) ) ,-5) ,7) ) ,7) ) ,7) ) +(transpose(transpose(arpeggio(transpose(transpose(((shuffle(X) |echo(arpeggio(transpose(shuffle(X) ,-5) ) ,4,6) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ,7) ) ,4) ,-5) ) ,-5) ,-5) +transpose(((transpose(step((arpeggio(step(transpose(((transpose(X,-5) +transpose((X+transpose(transpose(X,-5) ,12) ) ,4) ) +transpose((X|X) ,7) ) ,-5) ,12) ) |((((X|X) +(X|X) ) +(echo(transpose(X,-7) ,4,6) |transpose((shuffle(transpose(X,-7) ) +transpose((transpose(X,-5) +transpose(transpose(X,4) ,7) ) ,12) ) ,-5) ) ) +transpose(transpose(((transpose(echo(X,4,6) ,-5) +transpose(X,7) ) +transpose(((X+transpose((X|X) ,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,12) ) ,-7) ,7) ) ) ,12) ,4) +transpose(transpose((transpose(transpose(((transpose(X,4) +transpose((transpose(X,-7) +transpose(shuffle(X) ,7) ) ,12) ) +transpose(transpose(transpose((X+X) ,4) ,-7) ,7) ) ,-7) ,-7) +transpose(transpose(transpose(transpose(transpose(transpose(X,-7) ,4) ,4) ,4) ,-5) ,12) ) ,-5) ,12) ) +transpose(arpeggio((((((X+transpose(X,7) ) +transpose(transpose(X,4) ,7) ) +step(X,12) ) +transpose(((X|transpose((X+X) ,-5) ) +transpose((transpose(X,4) |X) ,-7) ) ,12) ) +transpose(transpose(((X+X) +(arpeggio(transpose(X,-7) ) |(X+transpose(X,7) ) ) ) ,4) ,12) ) ) ,7) ) ,7) ) ) +echo(transpose(((shuffle(echo(((((((shuffle(X) +(X|X) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-7) ) |(((X+transpose(X,7) ) +transpose((X+X) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,7) ) +transpose(transpose((((X+transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,4) ,4) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,-5) ,7) ) +transpose((transpose(transpose(transpose(X,-5) ,4) ,-5) +transpose(X,-5) ) ,7) ) +echo(transpose((transpose(X,-7) |(X+transpose((X+transpose(X,7) ) ,7) ) ) ,-5) ,4,6) ) ,4,6) ) +transpose((arpeggio(echo((transpose(transpose(X,4) ,-7) |(step(X,12) +step(X,12) ) ) ,4,6) ) +transpose(transpose(transpose((arpeggio(X) |X) ,-5) ,-7) ,12) ) ,4) ) +transpose(shuffle((((transpose(transpose(((X+transpose(X,4) ) +transpose(echo((X+X) ,4,6) ,7) ) ,-7) ,4) |((((((X+transpose(X,7) ) +transpose(X,4) ) +transpose((X|X) ,7) ) |shuffle((step(X,12) +transpose(transpose(X,-5) ,12) ) ) ) +transpose(((transpose(arpeggio(X) ,4) |X) +X) ,7) ) +transpose(echo((((echo(X,4,6) +transpose((X|X) ,7) ) +transpose(X,7) ) +(transpose(transpose(X,-7) ,-7) |(transpose(X,-5) +X) ) ) ,4,6) ,7) ) ) +transpose(transpose(transpose(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-5) ,-7) ,-5) ,4) ) +transpose(transpose(transpose(echo(step(X,12) ,4,6) ,4) ,-5) ,7) ) ) ,7) ) ,-5) ,4,6) ) ,4) ) +transpose((transpose((step(echo((echo(arpeggio(X) ,4,6) |transpose(transpose(step(X,12) ,-5) ,4) ) ,4,6) ,12) |(((transpose((X|X) ,-5) |((((transpose(transpose((X+transpose(X,12) ) ,-5) ,-5) +transpose(transpose((X+X) ,-5) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(step(X,12) +transpose((X+transpose(X,7) ) ,12) ) ) ,7) ) |(((X|X) +transpose(X,12) ) +(transpose(X,-5) +(X+arpeggio(X) ) ) ) ) +transpose(((X+transpose(echo(echo(X,4,6) ,4,6) ,4) ) +transpose(shuffle((transpose((X+X) ,-5) +transpose((step(X,12) +transpose((X+transpose(X,7) ) ,12) ) ,12) ) ) ,7) ) ,12) ) ) +transpose(arpeggio(shuffle(((X+X) |X) ) ) ,4) ) +transpose(((((X+transpose(X,12) ) +echo(X,4,6) ) +transpose(X,7) ) +transpose(transpose(X,4) ,12) ) ,7) ) ) ,4) +echo(shuffle(transpose(((shuffle(transpose(((((transpose(X,-7) +transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(transpose(X,-5) ,4) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) ,7) ) ,-7) ) +transpose((transpose((((X+transpose(X,12) ) |(transpose(X,4) |X) ) +transpose(((X+X) +transpose(transpose(X,4) ,12) ) ,7) ) ,4) +transpose(transpose(transpose(X,-7) ,-5) ,12) ) ,-7) ) +transpose((shuffle((echo(transpose(transpose((X|X) ,-7) ,-5) ,4,6) +transpose(transpose((transpose(X,4) +transpose((transpose(X,-7) +X) ,7) ) ,-5) ,-5) ) ) +transpose(shuffle(transpose(((X+transpose(X,7) ) +X) ,4) ) ,12) ) ,12) ) ,4) ) ,4,6) ) ,7) ) ,4,6) ,4,6) ,12) ,7) ) random seed used was 229115035

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