Tune Toys : Expresso

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.

Do you like this result? Do you want to let other people listen to it?

Save this one in the
Tune Trove!

See what's already
in the Tune Trove!

After 20 generations the expression "X" became this:

((transpose(((echo((arpeggio(((step((((arpeggio((arpeggio(step(X,12) ) +transpose(transpose(((X+transpose(X,7) ) +transpose((X+X) ,7) ) ,4) ,7) ) ) +transpose(echo(transpose(echo(echo(echo(shuffle(X) ,4,6) ,4,6) ,4,6) ,-7) ,4,6) ,4) ) +transpose(transpose(((shuffle(arpeggio(transpose((step(X,12) +transpose((X+transpose(X,12) ) ,12) ) ,-7) ) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,4) ) +transpose(arpeggio((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ) ,7) ) ,4) ,7) ) +transpose(((((((arpeggio(transpose((arpeggio(X) +X) ,-7) ) +transpose((shuffle(X) +transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,7) ) ) ,12) ) ,-7) ) +transpose(arpeggio(arpeggio(X) ) ,7) ) +transpose(echo((step(transpose((transpose(X,-7) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) ,12) ) ,4) ,12) +transpose((echo(X,4,6) +transpose((echo(X,4,6) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) ,12) ) ,4,6) ,4) ) +transpose((step((X|X) ,12) +transpose((((((X|X) +transpose(X,7) ) +transpose(X,-7) ) +transpose((((X+X) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,7) ) +transpose((transpose(((((X|X) +transpose(X,12) ) +transpose((transpose(X,4) |echo(X,4,6) ) ,7) ) +((transpose(shuffle(X) ,-5) +transpose(step((X|X) ,12) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,-5) +transpose(((shuffle(((arpeggio(X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ) +(arpeggio((X+transpose(X,12) ) ) +(step(X,12) +step(transpose(X,4) ,12) ) ) ) +transpose(((step((X+transpose((X|X) ,12) ) ,12) +transpose(shuffle((X+X) ) ,7) ) +(transpose(shuffle(X) ,4) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,12) ) ,7) ) ,4) ) +transpose(step(echo(transpose((step(((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,12) |transpose(X,-5) ) ,-5) ,4,6) ,12) ,7) ) ,12) ) ,12) +transpose(((shuffle(((transpose((echo((((X+transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(shuffle(X) ,7) ) ,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) +transpose(((arpeggio(step(step(X,12) ,12) ) +transpose(arpeggio(X) ,7) ) +transpose((echo(shuffle(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ) ,4,6) +transpose(transpose((X+transpose(X,12) ) ,-5) ,-7) ) ,12) ) ,7) ) +transpose(shuffle(echo(((X+X) |arpeggio(X) ) ,4,6) ) ,7) ) ) +transpose(step(shuffle((transpose(((X+transpose(((X+transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose(X,7) ) ,4) +(X+transpose((X+X) ,12) ) ) ) ,12) ,12) ) +((transpose((((transpose(echo(transpose(X,-5) ,4,6) ,4) +transpose(transpose((step((echo(X,4,6) |transpose(X,-5) ) ,12) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,4) ) +transpose(((X+transpose(X,12) ) +X) ,7) ) +transpose((((arpeggio((X+transpose(X,7) ) ) +transpose(((X+transpose(((X+transpose(X,12) ) |(X+transpose(X,12) ) ) ,4) ) +transpose((X+X) ,7) ) ,4) ) +transpose(transpose(((X|X) +transpose(transpose(X,-7) ,12) ) ,-7) ,7) ) |transpose(((((X+transpose((X|X) ,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(arpeggio(step(X,12) ) ,7) ) ,4) ) ,-5) ) ,-5) +transpose((((arpeggio(transpose((step(X,12) +transpose(arpeggio(X) ,12) ) ,-7) ) +transpose((((shuffle(X) +transpose((((X+X) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) +transpose(step(((X+transpose(X,12) ) +transpose(((X+transpose(X,12) ) +X) ,7) ) ,12) ,4) ) +transpose(transpose(shuffle(step(X,12) ) ,-7) ,7) ) ,7) ) +transpose(((X+X) |((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ) ,12) ) +transpose((((echo(X,4,6) +transpose(arpeggio((X+X) ) ,4) ) +transpose(step(transpose(step((X+X) ,12) ,-7) ,12) ,7) ) +transpose(arpeggio((arpeggio(transpose(X,4) ) |step(((echo(X,4,6) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) ) ,7) ) ,4) ) ,4) ) +transpose((((echo((transpose((X+transpose(X,12) ) ,-7) +transpose(echo(X,4,6) ,12) ) ,4,6) +transpose(echo(shuffle(((X+transpose(X,12) ) +transpose(X,12) ) ) ,4,6) ,4) ) +transpose(echo(echo(transpose(shuffle(X) ,4) ,4,6) ,4,6) ,7) ) +transpose(transpose(transpose(step((X+X) ,12) ,-7) ,-5) ,12) ) ,7) ) ) ,4) ) +transpose((step((shuffle((shuffle(X) |echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ) +transpose(transpose(echo(transpose(X,-5) ,4,6) ,-5) ,12) ) ,12) +transpose(transpose(((echo((transpose(transpose((X|X) ,-7) ,4) |step(echo(X,4,6) ,12) ) ,4,6) +transpose((shuffle(transpose(echo(transpose(arpeggio(X) ,-7) ,4,6) ,-5) ) +transpose((arpeggio((X+transpose(X,12) ) ) +transpose((arpeggio(X) +(X+transpose(X,12) ) ) ,7) ) ,12) ) ,4) ) +transpose(shuffle(transpose((X+echo(X,4,6) ) ,4) ) ,7) ) ,4) ,7) ) ,7) ) ) +transpose(shuffle((transpose(((arpeggio(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose((X+(X+transpose(X,12) ) ) ,4) ) +transpose((shuffle(X) +transpose(X,-7) ) ,7) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) ,12) ) ) +transpose((((step(step(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,12) ,12) +((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(echo((transpose(X,-5) +transpose(X,12) ) ,4,6) ,7) ) ) +transpose((((X|(X+transpose(X,12) ) ) +transpose(arpeggio((transpose(X,4) |X) ) ,7) ) +transpose(echo(X,4,6) ,7) ) ,7) ) +((((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) +transpose(((((((transpose(X,4) +transpose(X,7) ) +transpose(X,4) ) +transpose(step(step(X,12) ,12) ,7) ) +(X|transpose(echo(X,4,6) ,-5) ) ) +transpose(transpose(((X+X) +(X|X) ) ,-7) ,4) ) +transpose((((X|X) +transpose(X,7) ) +transpose(((X+transpose(X,12) ) +(X+transpose(X,7) ) ) ,7) ) ,7) ) ,12) ) +transpose(((transpose(X,-7) +transpose((X+X) ,7) ) |transpose(arpeggio(arpeggio((X+transpose(X,12) ) ) ) ,-5) ) ,4) ) +transpose(arpeggio((step(transpose(X,-5) ,12) +transpose(arpeggio(transpose(X,4) ) ,12) ) ) ,7) ) +transpose(transpose(shuffle(arpeggio(X) ) ,-7) ,12) ) ) ,4) ) +transpose(transpose((((arpeggio(arpeggio(((X+transpose(X,7) ) +transpose(X,7) ) ) ) +transpose(echo(shuffle(X) ,4,6) ,12) ) +transpose(((echo(((transpose(X,4) +transpose((X+transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4,6) +transpose((transpose(X,4) +transpose(transpose(X,-7) ,7) ) ,12) ) +transpose(X,12) ) ,4) ) +transpose((((transpose(echo(X,4,6) ,4) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ) +transpose((echo(X,4,6) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) ,4) ) +transpose(transpose((echo((X+transpose(X,7) ) ,4,6) +transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,-7) ,7) ) ,7) ) ,4) ,7) ) ,-5) +transpose((((arpeggio(((transpose(arpeggio(((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ) ,-7) +transpose(X,12) ) +transpose(step(step(((echo(X,4,6) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,12) ) +transpose(transpose(arpeggio(X) ,-5) ,12) ) ,12) ,12) ,12) ) ) +(((step((echo(X,4,6) |echo(shuffle(X) ,4,6) ) ,12) |step(arpeggio(shuffle(X) ) ,12) ) +(((((shuffle(step(X,12) ) +transpose((transpose(X,-5) +transpose(step(X,12) ,7) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(echo(X,4,6) ,7) ) +transpose(((step(X,12) +transpose(echo(((X+transpose(transpose(X,4) ,4) ) +transpose(shuffle(X) ,7) ) ,4,6) ,4) ) +transpose(transpose(shuffle(X) ,-5) ,7) ) ,12) ) +echo(X,4,6) ) ) |transpose(arpeggio(echo(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) +transpose(transpose(X,-7) ,12) ) ,4,6) ) ,4) ) ) +(echo(shuffle((X+transpose(arpeggio(X) ,7) ) ) ,4,6) |step((step((((transpose(arpeggio(X) ,-5) +transpose((X+transpose(transpose(X,4) ,7) ) ,4) ) +transpose(transpose((step(X,12) +transpose(X,12) ) ,-5) ,7) ) +transpose((((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,7) ) ,12) +transpose(arpeggio((transpose((X|X) ,-5) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ) ,12) ) ,12) ) ) +transpose(arpeggio((((step(step(step((step(X,12) +((echo(X,4,6) +transpose((shuffle(X) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose((X+transpose(step(X,12) ,7) ) ,7) ) ) ,12) ,12) ,12) +transpose((X+transpose(arpeggio((echo(X,4,6) +transpose(transpose(X,4) ,7) ) ) ,12) ) ,4) ) +transpose(arpeggio(((((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +(((X+transpose(X,7) ) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ) +transpose(echo((X+X) ,4,6) ,12) ) ) ,7) ) +transpose((echo((transpose((X+transpose(X,7) ) ,-5) +transpose(((step((X+X) ,12) +transpose((transpose((((X+transpose(X,12) ) +transpose((X|X) ,4) ) +transpose(X,7) ) ,-7) +transpose(echo(shuffle(shuffle(X) ) ,4,6) ,7) ) ,4) ) +transpose((((shuffle(X) +X) +transpose(step((transpose(X,4) |X) ,12) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,7) ) ,7) ) ,7) ) ,4,6) +transpose((shuffle(shuffle((X+transpose(shuffle(step(X,12) ) ,12) ) ) ) +transpose((transpose(X,4) +transpose(step(X,12) ,7) ) ,12) ) ,7) ) ,12) ) ) ,7) ) ,12) ) ) ,12) ) ,4,6) +transpose(step(shuffle((echo(transpose(echo(transpose(step(transpose(((X+transpose(X,7) ) |(X+transpose(X,7) ) ) ,4) ,12) ,-5) ,4,6) ,-5) ,4,6) |((echo(transpose((((step(step(X,12) ,12) +transpose((arpeggio(X) +transpose(X,7) ) ,12) ) +transpose(echo(shuffle(shuffle(X) ) ,4,6) ,4) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) +transpose(X,7) ) ,7) ) ,4) ,4,6) +transpose(echo(((echo(transpose(step(echo(arpeggio(X) ,4,6) ,12) ,-7) ,4,6) +transpose(transpose((transpose((echo(transpose((X+X) ,-5) ,4,6) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,7) ) ) ,4) +transpose((transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +step(X,12) ) ,4) +transpose(echo(X,4,6) ,12) ) ,7) ) ,4) ,12) ) +transpose((((transpose((((((arpeggio(X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((shuffle(X) +transpose(echo(X,4,6) ,12) ) ,12) ) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,4) ,7) ) ,-7) +transpose(step(transpose((echo(X,4,6) +transpose(X,7) ) ,4) ,12) ,4) ) +transpose((arpeggio(transpose((X|echo(X,4,6) ) ,-7) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,12) ) ,7) ) +transpose(echo((((transpose(((transpose(X,-7) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) +transpose((echo(X,4,6) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) +transpose(transpose(shuffle(X) ,4) ,12) ) |(transpose(arpeggio(transpose(echo(X,4,6) ,-5) ) ,4) +transpose(((transpose((step(X,12) +(X+transpose(X,12) ) ) ,-5) +transpose(shuffle(((X+X) +transpose(X,12) ) ) ,4) ) +transpose(shuffle(((arpeggio(X) |(X+transpose(X,12) ) ) +transpose(((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) ) ,7) ) ,12) ) ) ,4,6) ,12) ) ,7) ) ,4,6) ,4) ) +transpose((((arpeggio((arpeggio(shuffle(X) ) +transpose(arpeggio(X) ,7) ) ) +transpose(arpeggio(transpose((X+transpose(shuffle(X) ,7) ) ,4) ) ,12) ) +transpose(shuffle(((((X+X) +transpose(echo(X,4,6) ,7) ) +transpose(((transpose(X,4) +transpose(X,-5) ) |((arpeggio(echo(X,4,6) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(step((X+transpose(X,7) ) ,12) ,7) ) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) ) ,7) ) +transpose((arpeggio(X) +transpose(arpeggio((((X+transpose(X,12) ) |step(X,12) ) +transpose(X,12) ) ) ,7) ) ,-7) ) ,7) ) ) ) ,12) ,4) ) +transpose(arpeggio(transpose(step((((((((X+transpose(X,12) ) +X) +transpose(((((X+transpose(step(arpeggio(X) ,12) ,4) ) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) +transpose(((echo(X,4,6) +transpose(X,12) ) +X) ,12) ) |(X+transpose(step(X,12) ,12) ) ) ,12) ) +transpose(transpose((transpose((((X+X) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,4) +transpose(((echo((step(X,12) +transpose(transpose(X,4) ,7) ) ,4,6) +transpose(arpeggio(X) ,4) ) +transpose(transpose((transpose(X,4) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,7) ) ,12) ) ,-5) ,4) ) +transpose((arpeggio((echo((X+transpose(X,7) ) ,4,6) +transpose((X+transpose(X,7) ) ,12) ) ) +(arpeggio(((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(transpose(transpose(X,-7) ,-5) ,12) ) ) |(X+transpose(shuffle(X) ,7) ) ) ) ,7) ) |(echo((arpeggio(step(((X+transpose(transpose((X+X) ,-5) ,12) ) +transpose(echo(transpose((X+transpose(X,7) ) ,4) ,4,6) ,7) ) ,12) ) +transpose(transpose(arpeggio(transpose(shuffle(X) ,4) ) ,-7) ,7) ) ,4,6) +transpose(((transpose((X+transpose(X,12) ) ,-5) +transpose(shuffle(echo(echo((X+transpose(X,7) ) ,4,6) ,4,6) ) ,12) ) +transpose(arpeggio(((transpose(transpose(shuffle((X+transpose(X,7) ) ) ,-7) ,4) |arpeggio(X) ) +transpose(echo(transpose((echo((X|X) ,4,6) +transpose((((X+transpose(X,12) ) +transpose(transpose(X,-7) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) ,4) ,4,6) ,12) ) ) ,12) ) ,7) ) ) +transpose(echo((((X+transpose(transpose(X,-7) ,7) ) +transpose(((arpeggio(X) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,12) ) ,4,6) ,12) ) ,12) ,-7) ) ,7) ) ,-7) |((echo(arpeggio(transpose(transpose(transpose(((transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,4) +transpose(echo(transpose(X,-7) ,4,6) ,4) ) +transpose((X+transpose(shuffle(X) ,12) ) ,7) ) ,4) ,-5) ,4) ) ,4,6) +transpose(((((step((step((arpeggio((arpeggio(X) +transpose(X,12) ) ) +transpose((echo(X,4,6) |((((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) +transpose(((X+X) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ) ,12) ) ,12) +transpose((shuffle((((X|X) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +echo(transpose(step(X,12) ,4) ,4,6) ) ,12) ) ,12) |transpose(shuffle(arpeggio(arpeggio(step((X+transpose(X,12) ) ,12) ) ) ) ,-5) ) +transpose(arpeggio(arpeggio((echo((transpose(transpose(X,-5) ,-7) |((X+X) +transpose((X+transpose(X,12) ) ,7) ) ) ,4,6) +transpose(step(((arpeggio((X+X) ) +transpose(X,4) ) +transpose((echo(X,4,6) +transpose(X,7) ) ,7) ) ,12) ,12) ) ) ) ,4) ) +transpose(((((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(((X+X) +transpose(step(X,12) ,12) ) ,-5) ) |((((((step(X,12) +transpose(X,4) ) +transpose((transpose(X,-7) +transpose(((arpeggio(X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,7) ) ,7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |arpeggio(X) ) ,7) ) +transpose(((step((X+transpose(X,7) ) ,12) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) +(step(X,12) +transpose(X,7) ) ) ,7) ) +transpose(transpose((shuffle(transpose((X+transpose(X,7) ) ,-7) ) +transpose(((transpose(arpeggio(X) ,-5) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) ,12) ) ,-5) ,4) ) +transpose((((X+transpose((X+X) ,7) ) |shuffle(X) ) +transpose(((step(echo(X,4,6) ,12) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,12) ) +transpose(((transpose(X,-5) +transpose(step(X,12) ,4) ) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ,7) ) ,12) ) ,7) ) ) |(echo(transpose(((transpose(shuffle(X) ,-5) +transpose((step(X,12) +transpose((((X+X) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ) ,12) ) |shuffle(transpose(X,-5) ) ) ,4) ,4,6) +transpose(echo(step((X+transpose(X,7) ) ,12) ,4,6) ,7) ) ) +transpose(transpose(step((X+X) ,12) ,4) ,7) ) ,7) ) +transpose(echo(((shuffle((transpose((echo((X+transpose(X,12) ) ,4,6) +((((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((((X+transpose(X,12) ) +transpose(transpose(X,-5) ,4) ) +transpose(step(X,12) ,7) ) ,4) ) +transpose(arpeggio(step(X,12) ) ,7) ) ) ,-5) +transpose(((transpose(echo(X,4,6) ,-5) +transpose(((((X+transpose(X,4) ) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) +transpose((X+X) ,4) ) +transpose((shuffle(step(X,12) ) +transpose(X,12) ) ,7) ) ,4) ) +transpose((((X+X) +(echo(X,4,6) +transpose(X,12) ) ) +transpose(arpeggio(step(X,12) ) ,7) ) ,7) ) ,12) ) ) |(echo(((((((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(arpeggio(((X+transpose(X,4) ) +transpose((X|X) ,7) ) ) ,4) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,7) ) ,4,6) |arpeggio(transpose(X,4) ) ) ) +(shuffle(X) |(arpeggio(X) |shuffle(step(X,12) ) ) ) ) ,4,6) ,7) ) ,7) ) |transpose(step(echo(transpose((((shuffle(((transpose(X,-5) |X) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,12) ) ) +transpose(transpose(step(transpose(arpeggio(X) ,4) ,12) ,-7) ,7) ) +transpose(arpeggio(step(step(shuffle(((X+transpose(step(X,12) ,4) ) +transpose((X+X) ,7) ) ) ,12) ,12) ) ,12) ) |(((step((((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose((X+transpose((X|X) ,7) ) ,7) ) ,12) +transpose(((shuffle(X) +transpose((((echo(shuffle(transpose(X,-7) ) ,4,6) +transpose(X,4) ) +transpose(arpeggio(echo(X,4,6) ) ,7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,-7) ) ,4) ) +transpose((shuffle(X) +transpose(((X+transpose(X,12) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,7) ) ,12) ) +transpose((transpose(step(X,12) ,-5) +transpose(((transpose(step(arpeggio(X) ,12) ,-5) +transpose(((step(X,12) +arpeggio(X) ) +transpose(((X+transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,12) ) ,12) ) |((X+X) +transpose(transpose(transpose((X+X) ,4) ,4) ,7) ) ) ,12) ) ,12) ) +transpose(arpeggio(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,-7) ,12) ) +transpose(step(X,12) ,12) ) ) ,12) ) ) ,-7) ,4,6) ,12) ,-7) ) ) +step((((transpose(shuffle(step((((((((arpeggio((((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,12) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,7) ) ) +transpose(transpose(step(X,12) ,4) ,12) ) +transpose(transpose((echo(X,4,6) |X) ,4) ,4) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,7) ) +transpose(((arpeggio(transpose(X,-5) ) +((((X+X) +transpose(X,7) ) |(X+transpose(echo(X,4,6) ,7) ) ) +transpose((echo(X,4,6) |arpeggio(X) ) ,7) ) ) |(transpose(arpeggio(echo(X,4,6) ) ,-5) +transpose((((X+transpose((X+transpose(X,12) ) ,12) ) +transpose(transpose(X,-7) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) ) ,4) ) +transpose(arpeggio(step(((X|(X+transpose(X,12) ) ) +transpose(((X+transpose(X,12) ) +echo(X,4,6) ) ,12) ) ,12) ) ,7) ) +transpose(transpose(transpose(transpose((X|(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,-5) ,4) ,-7) ,4) ) +transpose(((transpose((((((X+transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((X|X) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose((transpose(X,-5) |X) ,7) ) ,-5) +transpose((step(arpeggio(X) ,12) |((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,7) ) ) ,12) ) +((transpose(step(X,12) ,4) +transpose((echo(transpose(echo(transpose(X,4) ,4,6) ,-7) ,4,6) +transpose(transpose((X+(X+transpose(X,7) ) ) ,-7) ,7) ) ,4) ) +transpose(((X+transpose(shuffle(step(transpose(X,-7) ,12) ) ,12) ) |transpose(X,4) ) ,7) ) ) ,7) ) ,12) ) ,-7) +transpose((((shuffle(((((((((((shuffle(X) +transpose(X,7) ) +echo((X+transpose(X,12) ) ,4,6) ) +transpose(transpose((step(transpose(X,4) ,12) +(echo(X,4,6) +transpose(X,7) ) ) ,-7) ,4) ) +transpose(((X+transpose(X,7) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(arpeggio(echo(X,4,6) ) ,7) ) ,7) ) ,7) ) +transpose((((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose((X+X) ,7) ) ,7) ) +transpose(transpose(transpose((X+X) ,-7) ,-5) ,7) ) ,4) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) +transpose(arpeggio(transpose((transpose(arpeggio(X) ,-7) +transpose((transpose(X,-5) +transpose(shuffle(X) ,12) ) ,12) ) ,-7) ) ,4) ) +transpose(transpose(arpeggio((X|X) ) ,-7) ,7) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((((((X|X) +shuffle(X) ) +(transpose(X,-7) |(X+transpose(X,7) ) ) ) +(X|X) ) |(echo(X,4,6) +echo(transpose(X,-5) ,4,6) ) ) ,4) ) +transpose(arpeggio(transpose(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-7) ,-5) ) ,7) ) ,4) ) +transpose((((transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4) +transpose(arpeggio(echo(X,4,6) ) ,4) ) +transpose((X+transpose((transpose(X,-7) +transpose(shuffle(X) ,12) ) ,12) ) ,7) ) |echo(X,4,6) ) ,7) ) ) +transpose(shuffle(echo(arpeggio((step((X+X) ,12) +transpose((step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) +transpose(step(step(echo(X,4,6) ,12) ,12) ,12) ) ,12) ) ) ,4,6) ) ,7) ) +transpose((((((echo(((X|X) +transpose(X,12) ) ,4,6) +transpose((X+transpose(step(echo(X,4,6) ,12) ,12) ) ,7) ) +transpose(arpeggio(shuffle(shuffle(shuffle(X) ) ) ) ,12) ) +transpose(arpeggio(transpose((transpose(X,-7) |X) ,4) ) ,4) ) +transpose(transpose(shuffle(echo((X+transpose((X+X) ,7) ) ,4,6) ) ,4) ,7) ) |arpeggio(arpeggio(echo(echo(echo(X,4,6) ,4,6) ,4,6) ) ) ) ,4) ) +transpose((step(arpeggio((arpeggio(arpeggio(X) ) +transpose((transpose(transpose(X,4) ,-5) +transpose(X,12) ) ,12) ) ) ,12) +transpose(arpeggio(arpeggio((step(X,12) +(step(step(X,12) ,12) +transpose(step((echo(X,4,6) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,12) ) ,12) ,12) ) ) ) ) ,12) ) ,7) ) ,4) ) +transpose(transpose(arpeggio(((echo(echo(step(transpose(arpeggio(X) ,-7) ,12) ,4,6) ,4,6) +transpose(arpeggio(echo((X+transpose(X,7) ) ,4,6) ) ,7) ) +transpose((shuffle(transpose(step((echo(X,4,6) +transpose(arpeggio(X) ,7) ) ,12) ,4) ) +transpose(((step(X,12) +transpose(echo((echo(((X|X) +transpose(transpose(shuffle(X) ,4) ,12) ) ,4,6) +transpose(step(shuffle((echo(transpose(X,-5) ,4,6) +transpose((X+transpose(X,12) ) ,12) ) ) ,12) ,12) ) ,4,6) ,4) ) +transpose((transpose(X,4) +transpose((X+transpose(X,7) ) ,12) ) ,7) ) ,7) ) ,7) ) ) ,4) ,7) ) +transpose((arpeggio(((arpeggio((step(((step(((shuffle(arpeggio(X) ) +transpose((((X+transpose(X,7) ) +transpose((X+X) ,4) ) +transpose(X,7) ) ,7) ) +(shuffle(X) +transpose((X+X) ,7) ) ) ,12) +transpose(step(transpose((arpeggio(step(X,12) ) +step(transpose(X,4) ,12) ) ,-5) ,12) ,12) ) +transpose((arpeggio(transpose((((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X|X) ,7) ) ,4) ) +transpose(((step(X,12) +transpose(X,12) ) +transpose(step(((X+transpose(X,12) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,7) ) ,12) ,7) ) ,12) ) ,12) ) ,12) +transpose(transpose(((((step((X+X) ,12) +transpose((X+transpose(arpeggio(X) ,7) ) ,7) ) +transpose((X|X) ,12) ) +transpose(arpeggio(transpose(step(X,12) ,4) ) ,12) ) +transpose(arpeggio(step(transpose(shuffle(X) ,4) ,12) ) ,7) ) ,-5) ,7) ) ) +transpose(shuffle((transpose((transpose(((echo(transpose(X,-7) ,4,6) +((X+X) +echo(X,4,6) ) ) |((transpose(X,-5) +transpose((transpose(X,-7) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(transpose(shuffle((X+X) ) ,-5) ,7) ) ) ,4) +transpose(arpeggio(transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-5) ) ,7) ) ,-5) +transpose(((transpose(X,-7) +transpose((transpose(((shuffle(X) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,4) |shuffle((X+transpose((X+transpose(X,7) ) ,12) ) ) ) ,12) ) +step(((((X+transpose(X,7) ) +X) +arpeggio(shuffle(X) ) ) |(X+transpose(X,7) ) ) ,12) ) ,12) ) ) ,12) ) +transpose((((transpose((transpose((transpose(((transpose((step(X,12) +transpose(X,12) ) ,-5) +transpose(((transpose((X+transpose(X,12) ) ,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(((X+transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ,7) ) ,4) ) +transpose((step(step(X,12) ,12) +transpose((arpeggio(X) |transpose(X,-7) ) ,12) ) ,7) ) ,-5) +transpose(arpeggio(shuffle(((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ) +transpose((X|X) ,7) ) ) ) ,12) ) ,-5) +transpose(shuffle(shuffle(transpose(shuffle(X) ,4) ) ) ,12) ) ,-7) +transpose(shuffle(echo(transpose(transpose(arpeggio(X) ,-7) ,-5) ,4,6) ) ,4) ) +transpose(((transpose((((transpose(transpose(shuffle(((shuffle(X) |(X+transpose(X,12) ) ) +transpose(((transpose(X,-7) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ) ,-7) ,-5) +transpose((((echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4,6) +transpose((((((X+transpose((X|step(X,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(X,7) ) ) +transpose(step(step(X,12) ,12) ,4) ) +transpose((X+echo(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4,6) ) ,7) ) ,4) ) +transpose(((arpeggio(X) +transpose((shuffle(X) |(X+transpose(X,12) ) ) ,12) ) +transpose(step((X+transpose(step(X,12) ,12) ) ,12) ,12) ) ,7) ) +transpose(((shuffle(X) +transpose((X|X) ,12) ) +transpose(((echo((X+transpose(X,12) ) ,4,6) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ,12) ) ,7) ) +transpose((transpose(step(step(X,12) ,12) ,-5) +((((X+X) +transpose(echo(X,4,6) ,12) ) +transpose((step(X,12) +transpose(step(X,12) ,7) ) ,12) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) ) ,4) ) +transpose((arpeggio(arpeggio(shuffle((transpose(X,-5) |(X+transpose(X,12) ) ) ) ) ) +transpose(((((shuffle(X) +(X+echo(X,4,6) ) ) +transpose(echo(echo(step(X,12) ,4,6) ,4,6) ,4) ) +transpose(transpose(transpose((shuffle(transpose(X,-7) ) +transpose((X+transpose(echo(X,4,6) ,7) ) ,12) ) ,-5) ,-5) ,7) ) |step(step(transpose(X,-5) ,12) ,12) ) ,12) ) ,7) ) ,4) +transpose(((transpose(transpose(transpose(X,-5) ,-5) ,-5) +transpose(arpeggio(arpeggio(transpose((echo(X,4,6) +transpose(step(X,12) ,7) ) ,-5) ) ) ,7) ) +transpose(transpose((((X+transpose(transpose(X,-5) ,12) ) +transpose(arpeggio(((step(X,12) +transpose(step(transpose((X+transpose(X,7) ) ,-7) ,12) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,7) ) +(echo(((arpeggio(X) +transpose((((X+X) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) +X) ,4,6) +transpose((transpose(shuffle(X) ,-7) +transpose(((X+transpose(transpose(transpose(X,4) ,4) ,4) ) +transpose((((X+transpose(X,7) ) +transpose(step((X+transpose(X,12) ) ,12) ,4) ) +transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) ,7) ) ,7) ) ,12) ) ) ,4) ,12) ) ,4) ) +transpose((step(shuffle(transpose((((transpose((X|X) ,4) +transpose(((X+transpose(X,12) ) +transpose(transpose(echo(X,4,6) ,4) ,12) ) ,4) ) +transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,7) ) +transpose(transpose(shuffle(arpeggio(X) ) ,4) ,12) ) ,-7) ) ,12) +transpose(arpeggio(((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(shuffle(arpeggio(X) ) ,4) ) +transpose(((((X+transpose(step(X,12) ,12) ) +transpose(arpeggio(X) ,7) ) +transpose(step(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,-5) ,12) ,4) ) +transpose(((echo(transpose(X,4) ,4,6) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose((shuffle(X) +transpose(X,7) ) ,7) ) ,7) ) ,7) ) ) ,12) ) ,7) ) ,4) ) +transpose(transpose(shuffle(((echo(transpose(transpose(X,4) ,-5) ,4,6) +transpose((((((step(step(X,12) ,12) +shuffle((X+X) ) ) +transpose(arpeggio(X) ,4) ) +transpose(((shuffle(X) +X) +transpose(X,12) ) ,7) ) +transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,12) ) +transpose(echo(echo(step((X+transpose(X,12) ) ,12) ,4,6) ,4,6) ,7) ) ) ,-5) ,7) ) ,12) ) ) |(shuffle(((((shuffle(X) +transpose(X,7) ) |(((X|X) +transpose((X+transpose(((X+transpose(X,12) ) +arpeggio(X) ) ,7) ) ,4) ) +transpose(shuffle(transpose(step(X,12) ,-7) ) ,7) ) ) +transpose(transpose(echo((X+shuffle(X) ) ,4,6) ,-5) ,7) ) +transpose(((arpeggio(echo(X,4,6) ) +transpose(transpose(arpeggio((transpose(transpose(X,4) ,4) +(arpeggio(X) +transpose(X,7) ) ) ) ,-5) ,4) ) +transpose((transpose((echo(X,4,6) +transpose((X+transpose(X,12) ) ,7) ) ,4) |(transpose(transpose((X+transpose((X+X) ,7) ) ,-5) ,-7) +transpose((((step(X,12) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose((X+transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,7) ) ,12) ) ) ,7) ) ,7) ) ) +transpose((step((transpose(((((shuffle(arpeggio(X) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(((X+transpose(X,7) ) |transpose(transpose(X,-7) ,-7) ) ,7) ) +transpose(transpose(((X+transpose(X,7) ) +(X+transpose(X,7) ) ) ,4) ,12) ) +transpose((X+transpose(((echo(X,4,6) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,4) +transpose(echo(step(((transpose(X,-5) |shuffle((X+transpose(X,12) ) ) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ,12) ,4,6) ,7) ) ,12) +(echo(transpose(X,4) ,4,6) |(echo((step((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) +transpose((arpeggio(X) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,7) ) ,4,6) +step((transpose(((X+transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) ,-5) +transpose(echo((((echo(X,4,6) +transpose((X+X) ,4) ) +transpose(step(X,12) ,7) ) +transpose(X,7) ) ,4,6) ,7) ) ,12) ) ) ) ,12) ) ) ,12) ) ,12) )
random seed used was 203193348

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