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:
Phrase for X:
# of Tracks:
Randomize patches:
 

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 the
Tune Trove!


See what's already
in the Tune Trove!

After 20 generations the expression "X" became this:
echo((((transpose((echo((transpose((((arpeggio(transpose((shuffle(X) |(((X|(X|X) ) |((transpose(X,4) +transpose(echo(X,4,6) ,4) ) +transpose(echo(X,4,6) ,7) ) ) +(transpose(X,4) |X) ) ) ,4) ) |step(echo(transpose(((((shuffle(X) |(X|X) ) +transpose(transpose(echo(X,4,6) ,4) ,12) ) +transpose(((transpose(X,-5) +transpose(step(X,12) ,12) ) +transpose((X+transpose(X,4) ) ,12) ) ,4) ) +transpose((echo(X,4,6) +transpose((X+transpose(X,12) ) ,-7) ) ,7) ) ,-5) ,4,6) ,12) ) |(transpose(echo(transpose(shuffle(((X+X) +(X+transpose(X,12) ) ) ) ,-5) ,4,6) ,-5) +transpose(((transpose((transpose(((transpose(X,-5) +transpose(transpose(X,4) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) +transpose(X,7) ) ,4) +transpose((((echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4,6) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +transpose((X+transpose(transpose((X|X) ,-7) ,12) ) ,7) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) +(((transpose(step(X,12) ,-7) +transpose(transpose(echo(X,4,6) ,4) ,4) ) +transpose((X+transpose((arpeggio(X) +transpose(shuffle(X) ,12) ) ,12) ) ,7) ) +((X+transpose(shuffle(transpose(X,-5) ) ,12) ) +transpose(((X+transpose(X,12) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) ,12) ) ) ) ,12) ) ) |arpeggio(step(shuffle(transpose((((X+transpose(transpose(X,4) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose((X|step(X,12) ) ,7) ) ,-5) ) ,12) ) ) ,-5) +((step((((((X+X) +shuffle(echo(X,4,6) ) ) +transpose((X|step(X,12) ) ,12) ) |(step(transpose(X,4) ,12) |transpose(arpeggio((X|X) ) ,-5) ) ) +transpose((((shuffle(X) +transpose(transpose(X,-5) ,12) ) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,12) ) ,12) +transpose((transpose(transpose(arpeggio(step(X,12) ) ,4) ,-5) |((shuffle(shuffle(echo((X+echo(X,4,6) ) ,4,6) ) ) +transpose(step(transpose((transpose(arpeggio(X) ,-5) +((X+transpose(X,12) ) +transpose((X+X) ,12) ) ) ,-5) ,12) ,4) ) +transpose((((X|echo(transpose(X,-7) ,4,6) ) +transpose(step(transpose((transpose(X,-7) +echo(X,4,6) ) ,4) ,12) ,4) ) +transpose(transpose((X+transpose(echo(X,4,6) ,7) ) ,-7) ,7) ) ,7) ) ) ,12) ) +(((transpose((((((transpose(echo(((X+X) +X) ,4,6) ,-5) +transpose(((X+transpose(X,12) ) |transpose(X,-5) ) ,12) ) +(transpose((X|X) ,-5) |transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose((X|X) ,7) ) ,-7) ) ) +transpose((transpose(X,-7) +transpose((X+X) ,7) ) ,7) ) +transpose((step(X,12) +transpose(transpose(X,-7) ,-7) ) ,4) ) +transpose(arpeggio((((transpose(X,-7) +transpose(X,12) ) +transpose(((X+X) +transpose(X,12) ) ,12) ) +transpose((echo((X+X) ,4,6) +transpose((transpose(X,-5) |X) ,7) ) ,7) ) ) ,7) ) ,4) +transpose(((arpeggio(step(X,12) ) +transpose(echo(((((shuffle((X+transpose(X,-5) ) ) +transpose(transpose(transpose(X,-5) ,4) ,4) ) +transpose(((transpose(X,4) |transpose(X,-5) ) +transpose(X,4) ) ,7) ) +transpose((transpose(X,4) |transpose((transpose(transpose(X,-5) ,-5) +transpose((transpose(X,-7) +transpose(X,7) ) ,12) ) ,-7) ) ,4) ) +transpose(((transpose((X+echo(X,4,6) ) ,-7) |((X+transpose(X,7) ) +transpose((X+X) ,7) ) ) +transpose(transpose(X,-7) ,-5) ) ,7) ) ,4,6) ,4) ) +transpose(transpose(step((((X+transpose(X,7) ) +transpose((X|X) ,7) ) +((X|X) +transpose(X,7) ) ) ,12) ,4) ,7) ) ,4) ) +transpose(transpose((transpose(X,4) |transpose(((X+transpose(arpeggio(X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) ,-5) ,7) ) +(step((((X+X) +(X+X) ) +X) ,12) |transpose(echo((X|X) ,4,6) ,-5) ) ) ) ) ,4,6) +transpose((((transpose((((transpose(((X|transpose(X,-5) ) |arpeggio(transpose(X,-5) ) ) ,4) +((X+X) |echo(X,4,6) ) ) +transpose((transpose(((X|echo(X,4,6) ) +transpose((transpose(X,-7) |echo(X,4,6) ) ,12) ) ,4) +transpose(transpose(transpose((transpose(X,-7) +transpose(step(X,12) ,7) ) ,-7) ,-5) ,7) ) ,7) ) +transpose(((transpose(arpeggio(transpose(X,-5) ) ,4) +(shuffle((X+transpose((X+transpose(X,7) ) ,7) ) ) +echo(arpeggio(X) ,4,6) ) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X+transpose(X,12) ) ) ,-7) ) ,-7) ) ,-5) +transpose((((((shuffle(transpose((X+transpose(X,12) ) ,4) ) +transpose(echo((shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ) +arpeggio(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose((X+shuffle(X) ) ,7) ) ) ) ,4,6) ,-7) ) |echo(transpose(transpose(arpeggio(transpose(transpose(X,-5) ,4) ) ,-5) ,-5) ,4,6) ) +transpose(shuffle(shuffle(((((X|X) +transpose(step((X+X) ,12) ,7) ) +transpose((transpose((step(X,12) +(X|X) ) ,-5) +transpose(arpeggio(transpose(shuffle(X) ,-7) ) ,12) ) ,4) ) +transpose(transpose(shuffle(X) ,4) ,7) ) ) ) ,7) ) +step(transpose(shuffle(((((transpose(X,-7) +transpose((X|X) ,12) ) |transpose(echo(X,4,6) ,4) ) |(transpose((X|X) ,4) |transpose(X,4) ) ) |transpose(arpeggio(step(X,12) ) ,4) ) ) ,4) ,12) ) +transpose(transpose(transpose(((arpeggio(((arpeggio((X+transpose(X,12) ) ) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) +transpose(transpose(shuffle((X+transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,12) ) ) ,-5) ,12) ) ) +shuffle((shuffle(X) +(echo(X,4,6) |(X+transpose(X,7) ) ) ) ) ) |((transpose(((transpose(transpose(X,-5) ,4) +transpose(transpose(echo(X,4,6) ,4) ,4) ) +transpose(transpose(X,4) ,7) ) ,-7) |echo((((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+X) ,7) ) ,4,6) ) |transpose((transpose(transpose(X,-5) ,4) |shuffle(((((X+X) +transpose(X,12) ) +transpose((transpose(X,4) +X) ,4) ) +transpose(shuffle(arpeggio(X) ) ,7) ) ) ) ,4) ) ) ,-7) ,-7) ,12) ) ,7) ) +transpose(transpose(transpose((((step((transpose(arpeggio(transpose(transpose(X,-5) ,-5) ) ,-5) |echo(transpose((X|X) ,-5) ,4,6) ) ,12) +transpose((((transpose((transpose(X,4) +transpose((X|X) ,7) ) ,-5) +transpose((((step(X,12) +transpose(step(X,12) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |transpose(X,-7) ) ,-7) ) +transpose(transpose(((shuffle(X) +transpose((((X|transpose(X,-7) ) +step(transpose(X,-7) ,12) ) +arpeggio((X|X) ) ) ,4) ) +transpose((transpose((shuffle(X) +step(X,12) ) ,-5) +X) ,7) ) ,-7) ,4) ) +transpose(transpose(arpeggio(((X+transpose(shuffle((X+transpose(X,7) ) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,4) ,7) ) ,4) ) +transpose(shuffle(transpose(transpose((((((X+X) +transpose(X,12) ) +((X|X) |step(X,12) ) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4) ) +transpose((((transpose(X,-5) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) +echo(X,4,6) ) ,7) ) ,-7) ,-7) ) ,7) ) +transpose(transpose((transpose(((X|transpose(X,-5) ) |(((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,7) ) |transpose((X+transpose(X,12) ) ,4) ) ) ,-5) +(arpeggio((X+transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) ) ) +transpose((X|X) ,12) ) ) ,-5) ,7) ) ,-5) ,-5) ,12) ) |transpose(((arpeggio(transpose(echo(step(((X+transpose(X,7) ) +shuffle(transpose(X,4) ) ) ,12) ,4,6) ,-7) ) +transpose(shuffle((transpose(transpose(transpose(transpose((X+X) ,-7) ,4) ,4) ,-5) |echo(arpeggio(transpose((transpose(transpose(X,4) ,-7) +transpose((X|echo((X+transpose(X,7) ) ,4,6) ) ,12) ) ,4) ) ,4,6) ) ) ,4) ) +transpose((transpose(shuffle(((transpose(X,-5) +transpose((X+transpose(X,7) ) ,7) ) |(X+transpose(X,7) ) ) ) ,4) |(shuffle((transpose(shuffle((X|X) ) ,4) +(X|((X+transpose(X,12) ) |transpose(X,-7) ) ) ) ) +(((transpose((((echo(step(X,12) ,4,6) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose(X,7) ) +transpose((((transpose(X,-7) +transpose(step(X,12) ,12) ) +transpose(((X+X) +transpose((X+X) ,7) ) ,4) ) +transpose(transpose((X+X) ,-5) ,7) ) ,7) ) ,-5) +transpose(transpose(transpose(((arpeggio((X|X) ) +transpose((transpose(X,4) |(X|X) ) ,4) ) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) ,-5) ,-5) ,12) ) +transpose(((transpose(arpeggio(((echo(X,4,6) +transpose(X,4) ) +transpose(X,7) ) ) ,-5) +(((X+X) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) +((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose((transpose(X,-5) +transpose(X,7) ) ,7) ) |((transpose(X,-5) +transpose((transpose(X,-5) |transpose(X,-5) ) ,4) ) +transpose((echo(X,4,6) +X) ,7) ) ) ) ) |(((X+transpose(X,12) ) +transpose(echo(X,4,6) ,12) ) +transpose(((transpose(X,-7) +transpose(transpose(transpose((X|X) ,-5) ,4) ,4) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +step(X,12) ) |transpose(X,-5) ) ,7) ) ,12) ) ) ,4) ) +transpose(((echo((transpose((X|(X|X) ) ,-5) +transpose(transpose(transpose(arpeggio(X) ,-5) ,-7) ,12) ) ,4,6) +transpose(X,12) ) +echo((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,12) ) +transpose((X|shuffle(X) ) ,7) ) +transpose(step(step(transpose(X,-7) ,12) ,12) ,7) ) ,4,6) ) ,7) ) ) ) ,7) ) ,-5) ) ,7) ) ,-5) +transpose(((((((transpose(echo((X|(echo(X,4,6) |X) ) ,4,6) ,-5) +transpose(((transpose(shuffle(X) ,-5) +transpose(transpose((X+transpose(X,7) ) ,-5) ,12) ) +step(transpose((transpose(X,-5) |(X|X) ) ,4) ,12) ) ,12) ) |echo(((((arpeggio(X) +transpose(echo(X,4,6) ,4) ) |transpose(transpose(X,-5) ,-7) ) +transpose((echo(arpeggio(X) ,4,6) +transpose(transpose(X,4) ,12) ) ,7) ) +transpose(((transpose(X,-5) |(shuffle(X) +transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,-5) ) ) +transpose(step(echo(arpeggio(X) ,4,6) ,12) ,7) ) ,12) ) ,4,6) ) +step((shuffle(X) +transpose((echo(arpeggio(X) ,4,6) +X) ,12) ) ,12) ) |(step((arpeggio(step((X+X) ,12) ) |transpose(((X|(X|X) ) +transpose((X+echo(X,4,6) ) ,7) ) ,-5) ) ,12) |((shuffle((transpose(X,4) |transpose(X,4) ) ) +transpose((transpose((X|(X+transpose(X,7) ) ) ,-5) +transpose(((X+transpose(X,12) ) +transpose(arpeggio(arpeggio(X) ) ,12) ) ,12) ) ,7) ) +transpose(transpose(transpose(X,-5) ,-7) ,12) ) ) ) +(((echo(transpose(transpose(step(X,12) ,-7) ,-7) ,4,6) |((step(X,12) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) +transpose(((step(X,12) |arpeggio(X) ) |(echo(X,4,6) +transpose(shuffle(X) ,12) ) ) ,7) ) ) +transpose(echo(transpose(step(((X|arpeggio(X) ) +shuffle(X) ) ,12) ,-7) ,4,6) ,4) ) +transpose(((((((((X|shuffle(X) ) +((X+transpose(X,7) ) +(X+transpose(X,12) ) ) ) +transpose(transpose(transpose(X,4) ,4) ,4) ) +transpose((step(transpose(X,-5) ,12) +transpose(((X|transpose(X,4) ) +(X+X) ) ,7) ) ,7) ) +transpose((X+transpose(transpose(echo(X,4,6) ,-5) ,7) ) ,7) ) +transpose((((echo(((X|step(X,12) ) |(echo(step(X,12) ,4,6) +transpose(step(X,12) ,4) ) ) ,4,6) +(transpose((X+X) ,-7) +((transpose(X,4) +((X+X) +(X+X) ) ) +(step(X,12) |X) ) ) ) +(shuffle(transpose(X,4) ) +transpose(step(transpose((transpose(X,-7) |X) ,4) ,12) ,12) ) ) +transpose(echo((transpose(transpose(transpose(X,-7) ,4) ,4) +transpose((X+transpose((transpose(X,-7) +transpose(X,7) ) ,12) ) ,12) ) ,4,6) ,12) ) ,4) ) +transpose(((shuffle((((transpose(X,-7) +X) +transpose(((X|X) +arpeggio(X) ) ,7) ) +(((shuffle(X) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +(X+X) ) ) ) +transpose(step((((arpeggio(transpose(X,4) ) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,-5) ,7) ) |transpose((X+X) ,4) ) ,12) ,4) ) +transpose(arpeggio(step((X|(X|X) ) ,12) ) ,7) ) ,7) ) +arpeggio(arpeggio(transpose(transpose((transpose(X,4) +(X|X) ) ,-5) ,-5) ) ) ) ,7) ) ) +(shuffle(echo(step((((transpose(step(transpose(((transpose(X,4) +((X+transpose(X,4) ) +transpose(X,7) ) ) +((X|X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-7) ,12) ,-7) +transpose(step((transpose(X,4) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ,12) ,4) ) +transpose(transpose(shuffle((X|echo((X+X) ,4,6) ) ) ,4) ,7) ) |((transpose(X,-5) +transpose((X+X) ,12) ) +transpose(transpose((echo(step(shuffle(X) ,12) ,4,6) +transpose((transpose(X,-5) +(((X+X) +transpose(echo(X,4,6) ,7) ) +transpose(((X+X) +transpose(X,4) ) ,7) ) ) ,7) ) ,4) ,12) ) ) ,12) ,4,6) ) +((transpose(((step((((echo(step(step(transpose(X,-5) ,12) ,12) ,4,6) +transpose(transpose(((transpose(X,4) +X) |arpeggio(step(X,12) ) ) ,4) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) +arpeggio(transpose(transpose(X,4) ,-5) ) ) ,12) +transpose((transpose((transpose((arpeggio(X) |shuffle(X) ) ,-5) +transpose(step(((X+transpose(X,7) ) +X) ,12) ,12) ) ,-5) +(transpose(transpose(transpose(X,-7) ,-7) ,4) +transpose(echo((X+transpose(arpeggio(X) ,4) ) ,4,6) ,7) ) ) ,4) ) +transpose(echo((transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,-7) +transpose(transpose(X,-5) ,4) ) ,4,6) ,7) ) ,4) +transpose(((step(shuffle(echo(transpose(transpose(X,-5) ,-5) ,4,6) ) ,12) +transpose(transpose(shuffle((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +(X+arpeggio(X) ) ) ) ,-7) ,12) ) |transpose(transpose(shuffle(transpose(transpose((X+X) ,-7) ,-5) ) ,4) ,-7) ) ,4) ) +transpose(transpose(transpose((((((transpose((X+transpose(X,12) ) ,-5) +transpose(echo((transpose(((X+transpose(X,4) ) +transpose((X|X) ,7) ) ,4) |(transpose(transpose(X,-7) ,-7) |transpose(transpose(X,-5) ,-5) ) ) ,4,6) ,4) ) +transpose((arpeggio(((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ) |((X+X) +(arpeggio(X) +X) ) ) ,7) ) +(((step(X,12) |echo(transpose(X,4) ,4,6) ) +transpose((transpose(transpose(X,-7) ,4) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) +transpose((X|(X|X) ) ,12) ) ) |(((transpose((X+transpose(X,12) ) ,4) +((X|X) +transpose(transpose(X,4) ,7) ) ) +transpose(transpose(transpose(shuffle(X) ,-7) ,-7) ,4) ) +transpose(((transpose((X+X) ,-5) +transpose((X+X) ,4) ) +echo((X|X) ,4,6) ) ,7) ) ) +transpose(transpose((transpose((X+(arpeggio(X) +X) ) ,4) +transpose((((X|X) +transpose(arpeggio(X) ,-5) ) +transpose(echo(((X+transpose(X,7) ) +transpose(X,12) ) ,4,6) ,7) ) ,12) ) ,-5) ,12) ) ,-7) ,-7) ,7) ) ) ) ,4) ) +transpose(arpeggio((transpose((((X+transpose(transpose(X,-5) ,12) ) +transpose((transpose((X|X) ,4) +step(transpose(X,-5) ,12) ) ,7) ) +transpose((transpose(transpose(X,-7) ,-5) +transpose(X,-5) ) ,12) ) ,4) +((arpeggio((transpose(step((transpose(X,4) +(((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,4) ) ) ,12) ,-5) +transpose((transpose((transpose(echo((X+(X+transpose(X,7) ) ) ,4,6) ,-7) +transpose((((arpeggio(X) |transpose(echo(X,4,6) ,-5) ) +transpose(echo((X+(X|X) ) ,4,6) ,12) ) +transpose(shuffle((X+transpose((X|X) ,7) ) ) ,4) ) ,7) ) ,-5) +(transpose(transpose(transpose(X,-7) ,4) ,-7) |(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(((((X+transpose(X,4) ) +transpose((X+X) ,7) ) +transpose(X,4) ) |((step(X,12) +transpose((X+transpose(X,7) ) ,12) ) +transpose(echo((X|X) ,4,6) ,7) ) ) ,12) ) ) ) ,7) ) ) +transpose(((((arpeggio(transpose(((shuffle((X+transpose(X,7) ) ) +transpose(((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) ,-5) ) |transpose(transpose(step((transpose(X,-7) |echo(X,4,6) ) ,12) ,4) ,4) ) |(transpose(transpose(shuffle(transpose(X,4) ) ,-5) ,-7) +transpose(transpose((transpose(X,-7) +transpose((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ) ,-5) ,12) ) ) +transpose(transpose(((transpose(shuffle((arpeggio((X+X) ) +transpose(((shuffle(X) +transpose((X+transpose(X,12) ) ,7) ) +arpeggio(X) ) ,12) ) ) ,-7) +transpose(transpose(transpose((transpose(shuffle(X) ,-5) +transpose(X,7) ) ,-5) ,-5) ,4) ) +transpose((echo(transpose(((transpose(X,4) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,4) ,4,6) +transpose(transpose(echo(((((X+transpose(X,12) ) |transpose(X,-5) ) +transpose(((X+transpose(X,7) ) +X) ,4) ) +transpose(((arpeggio(X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,7) ) ,4,6) ,-5) ,7) ) ,7) ) ,-7) ,7) ) |step((transpose(transpose(transpose((X|X) ,-7) ,4) ,-7) +transpose(shuffle(((transpose(echo((X|X) ,4,6) ,4) +transpose((arpeggio((X|X) ) |shuffle(X) ) ,7) ) +transpose(arpeggio(X) ,12) ) ) ,7) ) ,12) ) ,7) ) +transpose(((arpeggio(transpose(shuffle((X+X) ) ,4) ) +transpose(transpose(((((echo(X,4,6) +transpose(X,-5) ) |transpose(step(X,12) ,4) ) +transpose((X+transpose((transpose(echo((X|X) ,4,6) ,4) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,12) ) +((X|X) +(transpose(arpeggio(X) ,-7) +transpose((X|X) ,7) ) ) ) ,4) ,4) ) +transpose(step((shuffle(((arpeggio((X+transpose(shuffle(shuffle(X) ) ,7) ) ) +(transpose((X+X) ,-5) |(X+transpose(X,7) ) ) ) +step((echo(transpose(X,4) ,4,6) |(transpose(step(X,12) ,-7) +(X|(X+X) ) ) ) ,12) ) ) +transpose(shuffle(((transpose((X+(X|X) ) ,4) +transpose((((X|X) +transpose(shuffle(X) ,7) ) |transpose(X,-5) ) ,4) ) |step(((transpose((X+transpose(X,12) ) ,4) +transpose(X,4) ) +transpose(((X+transpose(X,7) ) |(X+X) ) ,7) ) ,12) ) ) ,7) ) ,12) ,7) ) ,7) ) ) ) ,7) ) |(((echo(shuffle(arpeggio(arpeggio((((X+transpose(X,7) ) +transpose(echo((transpose(X,-7) +transpose(arpeggio(X) ,12) ) ,4,6) ,7) ) +(transpose(echo(X,4,6) ,-5) |(echo(X,4,6) +transpose(X,4) ) ) ) ) ) ) ,4,6) +transpose(transpose(step(transpose((((transpose((X+X) ,-7) |((transpose(X,-7) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) |transpose((step(X,12) +transpose(X,12) ) ,4) ) +transpose(step(transpose((X|X) ,-5) ,12) ,-5) ) ,-5) ,12) ,4) ,7) ) +transpose(((((echo(shuffle(((X+transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose(arpeggio((((X|X) +transpose(X,4) ) +transpose(X,7) ) ) ,4) ,12) ) ) ,4,6) +transpose(((step(shuffle(((X+transpose(X,7) ) +transpose((step(X,12) +X) ,12) ) ) ,12) +(((transpose(X,-7) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) |transpose((X+transpose(X,12) ) ,-5) ) ) +transpose(((arpeggio(((((transpose((X+transpose(X,12) ) ,-7) |(X+X) ) +transpose(echo((X|X) ,4,6) ,4) ) +transpose(echo(X,4,6) ,7) ) |(transpose((step(X,12) +X) ,-7) +(transpose(transpose((X|X) ,-7) ,-5) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ) +transpose(step((((shuffle(X) +transpose(step(X,12) ,7) ) +transpose(((X+transpose(X,12) ) |(X|X) ) ,7) ) +((X+X) +transpose(X,7) ) ) ,12) ,4) ) +transpose(((arpeggio((transpose(transpose(X,-7) ,-5) +transpose(transpose(X,4) ,7) ) ) +transpose((((X+transpose(X,7) ) +X) +transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,7) ) ) ,7) ) ,4) ) +transpose((transpose(X,-5) +transpose(transpose((X+X) ,4) ,7) ) ,7) ) ,7) ) ,12) ) ,4) ) +transpose(transpose((((((transpose(X,4) |X) +transpose((step(X,12) |X) ,7) ) +transpose(((X+X) +transpose(((transpose(X,-7) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,12) ) ,7) ) +(transpose(transpose((X|X) ,-7) ,4) +transpose(echo(transpose((transpose(X,-7) +transpose(transpose(X,-5) ,7) ) ,-7) ,4,6) ,12) ) ) |step(arpeggio(transpose(shuffle(X) ,-7) ) ,12) ) ,-5) ,7) ) +transpose(arpeggio(echo(transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,4) ,4) ,4,6) ) ,-7) ) +transpose(((transpose(transpose(step(X,12) ,-7) ,-5) +transpose((transpose(X,-5) |step(transpose(X,-5) ,12) ) ,7) ) +echo(echo(shuffle(step((arpeggio((X+X) ) |transpose(X,4) ) ,12) ) ,4,6) ,4,6) ) ,7) ) ,12) ) +transpose((step(transpose(echo(((echo(transpose((X+transpose(X,7) ) ,-5) ,4,6) +shuffle(shuffle((((((X+transpose(transpose(X,-7) ,12) ) +transpose((echo(X,4,6) +transpose(arpeggio(X) ,12) ) ,4) ) +transpose(((X|X) |X) ,7) ) +transpose((arpeggio(arpeggio(X) ) +shuffle((X+transpose(X,7) ) ) ) ,12) ) |transpose(echo(echo((X|X) ,4,6) ,4,6) ,-7) ) ) ) ) |arpeggio(transpose(((((X+X) +transpose(echo(X,4,6) ,12) ) |(X|(X+transpose(X,7) ) ) ) +transpose((((transpose(X,4) +transpose(X,4) ) +transpose((transpose(X,4) |transpose(X,-7) ) ,7) ) +((echo(shuffle(X) ,4,6) +step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(step((transpose(X,4) +transpose(X,12) ) ,12) ,12) ) ) ,12) ) ,-5) ) ) ,4,6) ,-7) ,12) +transpose((step(arpeggio(((transpose((arpeggio((((transpose((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) +X) +transpose(echo(((X+X) +transpose(X,4) ) ,4,6) ,12) ) +(((transpose((X+transpose(X,12) ) ,4) |transpose((X+transpose(X,7) ) ,4) ) |shuffle((transpose(transpose(X,-7) ,4) +(((X+transpose(X,7) ) +transpose((X|X) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ) ) +echo(transpose(X,-5) ,4,6) ) ) ) +transpose(echo(transpose(transpose((step(transpose(((echo(X,4,6) +transpose((X|X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ,12) +echo((arpeggio(X) +transpose((X+X) ,-5) ) ,4,6) ) ,4) ,-7) ,4,6) ,7) ) ,4) +transpose(arpeggio(shuffle(((((((transpose(((X+transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) ,-7) +transpose((X|arpeggio(transpose(X,4) ) ) ,4) ) +transpose(transpose(echo(echo(X,4,6) ,4,6) ,-5) ,7) ) +transpose(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4) ,12) ) +transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) |transpose((X+X) ,4) ) ) ,12) ) +transpose(step(((step(X,12) +(X|X) ) +(X+transpose(echo(X,4,6) ,7) ) ) ,12) ,4) ) +transpose(step(((X+X) |(X+X) ) ,12) ,7) ) ) ) ,4) ) +transpose(step(transpose(echo(shuffle((X+transpose(X,7) ) ) ,4,6) ,-7) ,12) ,7) ) ) ,12) +transpose((shuffle(transpose((arpeggio(transpose((X|echo(X,4,6) ) ,4) ) +(((X+transpose(transpose((X|X) ,-7) ,4) ) +transpose(transpose(X,-5) ,7) ) +(transpose(arpeggio(X) ,-5) +transpose((X|(X+transpose(X,7) ) ) ,12) ) ) ) ,4) ) |((step((((transpose((X|X) ,4) +transpose(((transpose(X,-7) +transpose(shuffle(X) ,12) ) |X) ,4) ) +transpose((((X+X) |transpose(X,4) ) +echo(echo(X,4,6) ,4,6) ) ,7) ) +arpeggio(transpose(X,-7) ) ) ,12) +transpose((((transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-7) ) |step((X|X) ,12) ) ,-5) +transpose((transpose(((X+X) +transpose(shuffle(X) ,12) ) ,4) +step(arpeggio(X) ,12) ) ,7) ) |((transpose(transpose(X,-5) ,-7) +transpose(shuffle(((X|X) |(((X|X) +transpose(X,4) ) +transpose((X|X) ,7) ) ) ) ,4) ) +transpose(transpose(((((X+transpose(X,12) ) |X) +transpose(step(echo(X,4,6) ,12) ,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ,4) ,7) ) ) +transpose(transpose(transpose(((arpeggio(shuffle(X) ) +transpose((transpose(X,-5) +transpose((((X+transpose(X,7) ) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose((transpose(X,-7) |transpose(X,-5) ) ,7) ) ,-7) ,4) ,7) ) ,7) ) |(step(echo(transpose(transpose(X,-7) ,-7) ,4,6) ,12) +shuffle(arpeggio(transpose(((transpose((X|X) ,4) |X) +transpose(echo((X|X) ,4,6) ,12) ) ,-5) ) ) ) ) ) ,12) ) ,7) ) ,7) ) ) ,4,6)
random seed used was 124540689

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