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:
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After 20 generations the expression "X" became this:
((arpeggio(step(transpose((transpose(transpose((transpose(shuffle((X|X) ) ,4) |step((X|X) ,12) ) ,4) ,-7) +(((transpose((arpeggio(shuffle(((X|X) +(X+transpose(X,12) ) ) ) ) +transpose(transpose(X,-5) ,-5) ) ,4) +transpose((transpose(arpeggio((shuffle(X) +transpose(transpose(X,-5) ,12) ) ) ,-5) +transpose(transpose(X,4) ,7) ) ,7) ) +transpose(transpose((((transpose(echo(X,4,6) ,-5) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) |shuffle((((X|X) +transpose(transpose(X,-5) ,12) ) +transpose((X+transpose(X,12) ) ,12) ) ) ) ,-7) ,4) ) +transpose((((X+transpose(X,12) ) +transpose((((arpeggio((X+transpose(X,7) ) ) +transpose(transpose(arpeggio(X) ,-5) ,7) ) +transpose((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(((shuffle(((X+transpose((X+X) ,4) ) +transpose(X,7) ) ) +transpose(arpeggio(transpose(X,-5) ) ,4) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) ,7) ) ,12) ) |(((X+transpose(transpose(X,-7) ,12) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose((shuffle(X) +transpose((X+X) ,12) ) ,7) ) ,12) ) ) ,7) ) ) ,-5) ,12) ) +transpose(transpose(transpose(transpose(echo((step(transpose(echo(arpeggio(((transpose(X,-7) +transpose((X+transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ) ,4,6) ,4) ,12) +transpose(shuffle((transpose(echo(((transpose(arpeggio((X+transpose(X,7) ) ) ,-5) +transpose(echo(X,4,6) ,4) ) +transpose((((step(X,12) +transpose((X+transpose(shuffle(X) ,12) ) ,12) ) +transpose(transpose(arpeggio(transpose(X,-5) ) ,-7) ,4) ) +transpose(transpose((X|X) ,-5) ,7) ) ,7) ) ,4,6) ,-5) |(((transpose(X,-5) +transpose((step(X,12) +transpose(shuffle(echo(X,4,6) ) ,12) ) ,4) ) +transpose(X,7) ) |step(echo(((X|X) +transpose(transpose(X,4) ,12) ) ,4,6) ,12) ) ) ) ,7) ) ,4,6) ,-5) ,-5) ,-5) ,12) ) +transpose(shuffle(arpeggio(echo((((transpose(shuffle((arpeggio(transpose((echo(transpose(X,4) ,4,6) +transpose(((((X+transpose(X,7) ) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) |X) ,7) ) ,-7) ) +transpose(transpose(arpeggio(((transpose((X+transpose(X,12) ) ,-5) +transpose((echo(X,4,6) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ,4) ) +transpose(((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(step((X|X) ,12) ,4) ) +transpose(shuffle(arpeggio(transpose(X,-7) ) ) ,7) ) ,7) ) ) ,4) ,12) ) ) ,-7) +transpose(transpose((echo(transpose(transpose((((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,-7) ,-5) ,4,6) +(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) +transpose(transpose(step((step(X,12) +transpose(echo(X,4,6) ,7) ) ,12) ,-5) ,7) ) |transpose(transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,-5) ,-7) ,-5) ) +transpose(transpose(echo(transpose(X,4) ,4,6) ,-7) ,7) ) |step(transpose(echo(X,4,6) ,-5) ,12) ) ) ,-7) ,4) ) +transpose(((transpose(echo(step(shuffle((((X|X) +transpose((X+transpose(X,12) ) ,12) ) +echo(shuffle(((X+transpose(X,12) ) +step(X,12) ) ) ,4,6) ) ) ,12) ,4,6) ,4) |transpose(step(echo(((X+X) |transpose(echo(X,4,6) ,-5) ) ,4,6) ,12) ,-7) ) +echo(transpose(transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,-7) ,-5) ,-5) ,4,6) ) ,7) ) +transpose((shuffle((transpose((echo((((((arpeggio(shuffle(step(X,12) ) ) +transpose(transpose((transpose(X,-5) +(X+transpose(X,7) ) ) ,-7) ,4) ) +transpose(arpeggio(step(((echo(echo(transpose(X,-5) ,4,6) ,4,6) +transpose(transpose(shuffle(X) ,-5) ,4) ) +transpose(X,7) ) ,12) ) ,7) ) +(transpose((X+transpose(X,12) ) ,-5) +transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose((X+transpose(X,-7) ) ,7) ) ,12) ) ) +transpose((((echo(transpose(X,4) ,4,6) |step(X,12) ) +transpose((transpose(arpeggio(X) ,-5) +(X+transpose(X,12) ) ) ,7) ) |step((X+transpose(X,7) ) ,12) ) ,4) ) +transpose(transpose(shuffle(step(transpose(transpose(X,-5) ,-5) ,12) ) ,4) ,7) ) ,4,6) +transpose(transpose(echo((transpose(X,-7) +transpose(transpose(transpose(X,-5) ,-5) ,12) ) ,4,6) ,-5) ,12) ) ,-5) +shuffle((transpose(shuffle(transpose((transpose(shuffle(transpose(X,-5) ) ,-5) +transpose(echo(X,4,6) ,12) ) ,-5) ) ,-7) |shuffle(step(arpeggio(X) ,12) ) ) ) ) ) |echo((transpose((transpose(transpose((((transpose(X,-7) +transpose(echo(X,4,6) ,7) ) |((X+X) +transpose((X+transpose(arpeggio(X) ,7) ) ,7) ) ) |((transpose(X,-5) +transpose(X,12) ) +transpose((((X+transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) |transpose(X,4) ) ,7) ) ) ,-5) ,-7) +transpose(transpose(step(arpeggio((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) +transpose(step(transpose(step(step(X,12) ,12) ,-5) ,12) ,4) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ) ,12) ,-5) ,4) ) ,-5) +transpose((((((echo(transpose(shuffle(((X+(X|X) ) +transpose(arpeggio(transpose(X,-5) ) ,7) ) ) ,-7) ,4,6) +transpose((((transpose((((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) |transpose((X+transpose(X,12) ) ,-7) ) ,-5) +transpose((((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,12) ) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) +transpose((X|(X+transpose(X,7) ) ) ,7) ) +transpose((X+transpose(arpeggio(X) ,7) ) ,12) ) ,12) ) +transpose(arpeggio((shuffle((shuffle(X) +transpose(transpose(X,-5) ,12) ) ) +transpose(((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(transpose(X,4) ,4) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) ,7) ) ) ,4) ) +transpose((arpeggio(X) |echo(X,4,6) ) ,7) ) ,7) ) +transpose(shuffle((transpose(((transpose(X,-7) +transpose(shuffle(transpose(X,-5) ) ,12) ) +transpose(((X+transpose(echo(shuffle(X) ,4,6) ,4) ) +transpose(((X|X) +X) ,7) ) ,7) ) ,-5) +transpose(((echo(X,4,6) +transpose(((((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose((X|transpose(X,-5) ) ,12) ) +(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) |arpeggio(step(X,12) ) ) ) |(echo(arpeggio(X) ,4,6) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ) ,4) ) +transpose((transpose(X,4) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ,7) ) ,12) ) ) ,7) ) +transpose(((((arpeggio(transpose(step(arpeggio(shuffle(X) ) ,12) ,-5) ) +transpose(transpose(transpose(((step(X,12) +transpose(X,4) ) +transpose((X|transpose((X+transpose(X,12) ) ,-7) ) ,12) ) ,-5) ,-5) ,7) ) +transpose(transpose(arpeggio(X) ,4) ,4) ) +transpose(((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(echo(transpose(transpose(X,-7) ,-5) ,4,6) ,4) ) +transpose(transpose((transpose(X,-7) +(transpose(X,-5) +transpose(transpose(X,-7) ,12) ) ) ,-5) ,7) ) ,7) ) +(transpose((shuffle(transpose(X,-5) ) |echo(X,4,6) ) ,-5) |transpose(transpose(X,-7) ,-5) ) ) ,7) ) +transpose((echo(step(transpose(transpose(shuffle(transpose((transpose(X,-5) +transpose((X+transpose(X,12) ) ,12) ) ,4) ) ,-7) ,-5) ,12) ,4,6) +((transpose((X+transpose(X,12) ) ,-7) +transpose((echo((X+transpose(X,12) ) ,4,6) +transpose(echo(step(X,12) ,4,6) ,7) ) ,4) ) +transpose((X|X) ,7) ) ) ,4) ) +transpose((transpose(((transpose(echo(X,4,6) ,-7) |arpeggio(transpose(transpose(X,-5) ,-7) ) ) +transpose(arpeggio(((step((X+transpose(X,12) ) ,12) +transpose(transpose((transpose(X,-5) |X) ,-7) ,4) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) ) ,7) ) ,-7) |arpeggio(transpose(transpose(((((X|X) +transpose(X,7) ) +transpose(transpose(echo((X+transpose(X,12) ) ,4,6) ,-7) ,4) ) +transpose(transpose(shuffle(transpose(echo(X,4,6) ,-5) ) ,-7) ,7) ) ,-5) ,-7) ) ) ,7) ) ,7) ) ,4,6) ) ,7) ) ,4,6) ) ) ,7) )
random seed used was 88

NOTE: Generated phrase was too large ( 34572 ) , it has been truncated at 5000 notes. EXPR = (transpose(arpeggio(arpeggio((transpose(((echo(transpose(transpose(step(X,12) ,-7) ,4) ,4,6) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) +transpose((transpose(((transpose(X,-7) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) +transpose((arpeggio(X) |X) ,12) ) ,7) ) ,-5) +transpose((transpose(transpose(echo(transpose(X,-5) ,4,6) ,4) ,-5) +echo(arpeggio(((X+X) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ) ,4,6) ) ,12) ) ) ) ,-5) +transpose(arpeggio(transpose(((echo(((arpeggio((step(transpose(arpeggio((X+transpose(X,7) ) ) ,-5) ,12) |(arpeggio((X|transpose(X,-5) ) ) +transpose((X+step(X,12) ) ,7) ) ) ) +transpose(transpose(((step(echo(echo(transpose(shuffle(transpose(X,-7) ) ,-5) ,4,6) ,4,6) ,12) +transpose(transpose(arpeggio((step(transpose(X,-7) ,12) +transpose(((((transpose(X,-7) +transpose(transpose(X,-5) ,12) ) +transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) +transpose(transpose(transpose(transpose(X,-7) ,-7) ,-5) ,12) ) ,7) ) ) ,-7) ,4) ) +transpose((step((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-5) |(arpeggio(echo(X,4,6) ) +transpose((X+transpose(transpose(X,-5) ,12) ) ,7) ) ) ,12) +transpose(shuffle((X+transpose(X,12) ) ) ,-5) ) ,7) ) ,4) ,-7) ) +(((echo((((((((((transpose(X,-7) +transpose((X|X) ,4) ) +transpose((X+X) ,7) ) +transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) ,7) ) +transpose(step(((X+X) |echo(X,4,6) ) ,12) ,7) ) +(X|((X+transpose(X,12) ) +transpose((transpose(X,-5) +(X+transpose(X,12) ) ) ,7) ) ) ) +transpose(((((X+transpose(transpose(X,-5) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) +transpose(shuffle(transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,-5) ) ,4) ) +transpose(((X+transpose((shuffle(X) |(X+transpose(X,12) ) ) ,4) ) +transpose(((X+transpose(X,12) ) +transpose(X,-7) ) ,7) ) ,7) ) ,12) ) +transpose(shuffle(transpose(transpose(X,4) ,-5) ) ,4) ) +transpose(step(step(step(X,12) ,12) ,12) ,7) ) +transpose(shuffle(((shuffle(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) +transpose(transpose((step(X,12) +transpose(X,-5) ) ,-5) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ) ,7) ) ,4,6) +echo(transpose(transpose((step(X,12) +transpose(((((X+X) +transpose(X,-7) ) +echo(X,4,6) ) |transpose(X,-5) ) ,7) ) ,-7) ,-5) ,4,6) ) +transpose((step(transpose((step(((step((X+X) ,12) +transpose(transpose(shuffle(X) ,-5) ,4) ) +transpose(transpose(arpeggio(step(X,12) ) ,-5) ,7) ) ,12) +transpose(echo(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,7) ) ,4,6) ,12) ) ,-5) ,12) +transpose(transpose(((shuffle(transpose((transpose(transpose(X,4) ,-5) +transpose(X,7) ) ,-5) ) +transpose(echo(transpose(echo(step(step(X,12) ,12) ,4,6) ,-5) ,4,6) ,4) ) +transpose(((transpose((X+X) ,-7) +transpose((transpose((X|X) ,4) +transpose(transpose(transpose(step(step(X,12) ,12) ,4) ,-5) ,12) ) ,4) ) +transpose(arpeggio(shuffle(transpose(transpose(echo((X+transpose(X,7) ) ,4,6) ,-5) ,-7) ) ) ,7) ) ,7) ) ,-5) ,12) ) ,4) ) +transpose(transpose((transpose((arpeggio(X) |((((shuffle(X) +transpose(X,12) ) +transpose(((X|X) +transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) +transpose(step(echo(X,4,6) ,12) ,7) ) ) ,-5) +transpose((((X+transpose(transpose(X,-7) ,7) ) +transpose((arpeggio(step(X,12) ) +transpose(X,12) ) ,12) ) |transpose(arpeggio(X) ,-7) ) ,12) ) ,-7) ,7) ) ) ,4,6) +transpose((echo((shuffle((step(step((transpose(transpose(transpose(shuffle(echo(X,4,6) ) ,-7) ,-5) ,-7) +transpose(transpose(arpeggio(X) ,-5) ,7) ) ,12) ,12) +transpose(transpose((transpose(((transpose(echo(arpeggio(X) ,4,6) ,-7) +transpose(X,4) ) +transpose(step(transpose(X,-7) ,12) ,7) ) ,-5) +transpose((step(transpose(step(transpose(X,-5) ,12) ,-5) ,12) +transpose(((arpeggio(X) +transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) ,7) ) ,-5) ,12) ) ) +transpose((transpose((transpose((transpose(X,-5) +transpose(transpose(step(X,12) ,-5) ,12) ) ,-7) +echo(((shuffle(transpose(transpose(X,-5) ,-5) ) +transpose(((echo(X,4,6) +transpose((X+transpose(X,12) ) ,4) ) +transpose(step(X,12) ,7) ) ,4) ) +transpose(step(X,12) ,7) ) ,4,6) ) ,-5) +transpose(shuffle(transpose(transpose(transpose((X+transpose(X,7) ) ,-5) ,-5) ,-5) ) ,12) ) ,12) ) ,4,6) +transpose(((transpose(echo(echo(transpose(transpose(((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +((transpose((X|X) ,-5) +transpose((X+transpose(X,7) ) ,4) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) ) ,-5) ,-5) ,4,6) ,4,6) ,-7) +transpose(transpose(arpeggio((step(shuffle(X) ,12) +((transpose(arpeggio(((transpose((X+transpose(X,7) ) ,-5) +transpose((X+transpose(X,7) ) ,12) ) +transpose(step(echo((X+transpose(X,12) ) ,4,6) ,12) ,7) ) ) ,4) +transpose(shuffle((step(shuffle(X) ,12) +((transpose(((step(X,12) +transpose(step(X,12) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-7) +transpose(echo((X+transpose(X,7) ) ,4,6) ,4) ) +transpose((transpose(X,-5) +transpose(X,12) ) ,7) ) ) ) ,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ) ) ,4) ,4) ) +transpose((step(transpose(echo(echo(arpeggio((transpose(echo((transpose(X,4) +transpose(transpose(X,-7) ,7) ) ,4,6) ,-7) +transpose((transpose(echo(X,4,6) ,-5) +(X+transpose(X,12) ) ) ,-5) ) ) ,4,6) ,4,6) ,-7) ,12) +transpose(transpose((echo(step(arpeggio(((X+transpose(X,12) ) +transpose(step(X,12) ,12) ) ) ,12) ,4,6) +transpose((arpeggio(echo(X,4,6) ) |((step((X|X) ,12) +transpose((transpose(X,4) +transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) ) ,12) ) ,-5) ,7) ) ,7) ) ,12) ) ,7) ) +transpose(transpose((((transpose((transpose(((echo(shuffle(X) ,4,6) +(X+transpose(X,7) ) ) +transpose(((transpose(X,-7) +transpose(transpose(X,-7) ,7) ) +transpose(transpose(X,-5) ,12) ) ,7) ) ,-7) |transpose((transpose(shuffle(echo((transpose(X,-5) +transpose(transpose(X,-5) ,7) ) ,4,6) ) ,-7) +((transpose(transpose(echo(X,4,6) ,4) ,-7) +transpose(arpeggio(shuffle((transpose(shuffle(X) ,-7) +transpose((transpose((X|X) ,-7) |X) ,12) ) ) ) ,4) ) +transpose((((((transpose(X,-5) +transpose(((X+transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,4) ) +transpose(((X+transpose(shuffle(X) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) +transpose(transpose((X+X) ,-7) ,12) ) +transpose((X+transpose((transpose(X,-5) |step(X,12) ) ,12) ) ,12) ) ,7) ) ) ,-5) ) ,-5) +transpose(transpose(transpose((step((step(X,12) +transpose(X,12) ) ,12) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ,12) ) ,-5) ,-7) ,4) ) +transpose(transpose((((((transpose(echo((shuffle(X) |X) ,4,6) ,-5) +transpose((((X+X) |echo((X+transpose(X,12) ) ,4,6) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) +transpose(transpose(((X+transpose(X,7) ) +transpose(shuffle(((X+transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) ) ,12) ) ,-7) ,4) ) +transpose(transpose(transpose(transpose(transpose(transpose(X,4) ,-5) ,-7) ,-7) ,-5) ,7) ) +transpose((step((((X+transpose(X,12) ) +transpose(X,7) ) |X) ,12) +((arpeggio(transpose(transpose(X,-7) ,-7) ) +transpose(((X+transpose(X,7) ) +transpose((shuffle(step(X,12) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ,12) ) ,12) ) ,7) ) +transpose(transpose((shuffle(X) +transpose(transpose(X,-5) ,7) ) ,4) ,12) ) ) ,4) ) +transpose((arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) |(arpeggio((X+transpose(echo(X,4,6) ,12) ) ) +transpose(transpose(echo(X,4,6) ,-5) ,12) ) ) ,7) ) ,-5) ,7) ) +transpose(((echo((((arpeggio(transpose(transpose((X+transpose(X,12) ) ,-7) ,-5) ) +transpose(echo(echo((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(transpose(X,-7) ,-7) ) ,4,6) ,4,6) ,7) ) +transpose(transpose(shuffle((arpeggio(X) +transpose((X+transpose(X,12) ) ,7) ) ) ,-5) ,12) ) +transpose((transpose(step(transpose(X,-7) ,12) ,4) +transpose(arpeggio((step(X,12) +shuffle((X|X) ) ) ) ,7) ) ,7) ) ,4,6) +transpose(transpose(transpose(((X+transpose(X,12) ) +(X+transpose(X,12) ) ) ,-7) ,-5) ,7) ) |step(((transpose(X,-7) +transpose((X+transpose(X,12) ) ,7) ) +transpose((shuffle(X) +transpose(echo(X,4,6) ,7) ) ,7) ) ,12) ) ,7) ) ,-7) ,12) ) ,-7) ) ,7) )
random seed used was 0

NOTE: Generated phrase was too large ( 16940 ) , it has been truncated at 5000 notes.


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