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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.
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After 15 generations the expression "X" became this: | (((transpose((((step(shuffle(shuffle(transpose(X,4) ) ) ,12) +transpose(((shuffle(((X|X) +transpose(X,12) ) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(arpeggio((((X+transpose(X,12) ) +transpose(transpose(step(X,12) ,4) ,4) ) +transpose(X,7) ) ) ,7) ) +transpose((arpeggio(arpeggio(X) ) +transpose(arpeggio(step(arpeggio(X) ,12) ) ,7) ) ,7) ) ,-7) +transpose((((step(X,12) +(X+transpose(X,7) ) ) +arpeggio(transpose(X,4) ) ) +transpose((transpose(shuffle(shuffle(X) ) ,-7) |((X+transpose(X,12) ) +transpose(X,12) ) ) ,12) ) ,4) ) +transpose(((X+transpose(arpeggio(X) ,12) ) +transpose(shuffle(transpose(X,-7) ) ,7) ) ,7) ) +transpose(((shuffle(((transpose((echo(arpeggio(step(echo(X,4,6) ,12) ) ,4,6) +transpose((arpeggio(X) +transpose(step(transpose(X,-7) ,12) ,12) ) ,7) ) ,-7) +transpose((transpose(transpose(transpose((X+X) ,-7) ,-5) ,-7) |transpose((step((echo(transpose(X,-7) ,4,6) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,12) +transpose((transpose((X+transpose(X,12) ) ,-7) |transpose(X,-5) ) ,7) ) ,4) ) ,7) ) +transpose(((shuffle(shuffle((transpose(transpose(shuffle(transpose(X,4) ) ,-7) ,-7) +transpose((transpose(transpose(X,4) ,-7) +transpose((echo(X,4,6) |X) ,12) ) ,7) ) ) ) +transpose(transpose(echo(transpose((X|X) ,-7) ,4,6) ,-7) ,4) ) +transpose((transpose(transpose(echo(echo(shuffle(X) ,4,6) ,4,6) ,-7) ,-7) +transpose(step(transpose(shuffle(transpose(X,-7) ) ,-7) ,12) ,7) ) ,7) ) ,12) ) ) +transpose(echo(echo(((((X+transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) +transpose((transpose(echo(X,4,6) ,-5) |(X+transpose(X,12) ) ) ,7) ) ,4,6) ,4,6) ,4) ) +transpose(step(arpeggio(step(transpose(X,-7) ,12) ) ,12) ,7) ) ,12) ) random seed used was 12
EXPR = shuffle(((transpose((((arpeggio(((arpeggio(shuffle((((X+transpose(X,7) ) +echo((shuffle(X) +transpose(X,-7) ) ,4,6) ) +transpose(transpose((transpose(X,-5) +transpose(step(X,12) ,7) ) ,-7) ,7) ) ) ) +transpose(transpose(step(X,12) ,-7) ,4) ) +transpose(transpose(arpeggio(shuffle((X|(X+transpose(X,12) ) ) ) ) ,4) ,7) ) ) +transpose((transpose(echo(((transpose(step(echo(transpose(X,-7) ,4,6) ,12) ,4) +transpose(shuffle(transpose(X,-7) ) ,4) ) +transpose(((((X+transpose(echo(X,4,6) ,12) ) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose(((step(X,12) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(transpose(echo(transpose(X,-7) ,4,6) ,-7) ,7) ) +step((echo(X,4,6) +arpeggio(X) ) ,12) ) ,7) ) ,4,6) ,-7) +transpose(transpose((transpose((transpose(X,-5) +transpose(X,12) ) ,-7) +((((X+transpose(X,12) ) +transpose(echo(arpeggio(X) ,4,6) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +echo(X,4,6) ) ,12) ) ) ,-5) ,12) ) ,4) ) +transpose(shuffle((step(((transpose(X,-7) +transpose(transpose(X,-5) ,4) ) +transpose(step(X,12) ,7) ) ,12) +step(shuffle(((step(step(X,12) ,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) ) ,12) ) ) ,7) ) +((transpose(transpose(shuffle(X) ,-5) ,-5) +transpose(arpeggio((shuffle(step(((transpose((transpose(X,-7) +transpose((X+transpose(X,7) ) ,7) ) ,-7) +transpose(((echo(X,4,6) +transpose((X|X) ,7) ) |shuffle(transpose(X,-7) ) ) ,4) ) +transpose(((X+transpose((X+X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,12) ) +transpose(transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose((X+X) ,7) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) +transpose((X|transpose(X,4) ) ,7) ) ,4) ,12) ) ) ,4) ) +transpose(transpose(step((transpose(X,-5) +transpose((X+transpose(X,7) ) ,7) ) ,12) ,-7) ,7) ) ) ,-5) +transpose(transpose(((shuffle(transpose(arpeggio(transpose((X+transpose(X,12) ) ,-7) ) ,-7) ) +transpose(((transpose(transpose(shuffle(((shuffle(X) +transpose(arpeggio(X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,-7) ,-5) +transpose(transpose((transpose((arpeggio(((X+transpose((X+transpose(X,12) ) ,12) ) +transpose(transpose(X,-7) ,12) ) ) +transpose(((transpose(X,-7) +transpose((arpeggio((X+X) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose((step((X+transpose(X,12) ) ,12) +transpose((X|X) ,7) ) ,7) ) ,7) ) ,-5) |(transpose(shuffle((X+X) ) ,-7) +transpose(arpeggio(shuffle(X) ) ,7) ) ) ,-7) ,4) ) +transpose(shuffle(transpose(transpose(echo(((step(X,12) +(X|X) ) +(transpose(X,-7) +transpose(X,12) ) ) ,4,6) ,-7) ,-7) ) ,7) ) ,4) ) +transpose(echo(arpeggio(echo(transpose(((echo(X,4,6) |arpeggio(arpeggio(transpose(X,-7) ) ) ) +transpose((X|echo(X,4,6) ) ,7) ) ,-7) ,4,6) ) ,4,6) ,7) ) ,-5) ,7) ) |transpose(((transpose(transpose(((step(shuffle(X) ,12) +transpose(shuffle(((X+X) +transpose(X,7) ) ) ,12) ) +transpose(step((arpeggio(X) +transpose(((X|X) +transpose(transpose(X,-5) ,12) ) ,7) ) ,12) ,12) ) ,4) ,-7) +transpose(((((transpose(step(shuffle(X) ,12) ,-7) |transpose(shuffle(step(X,12) ) ,-7) ) +transpose(((echo(X,4,6) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) +transpose((step(X,12) +transpose((X|X) ,7) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) +transpose(((((step(transpose(X,-7) ,12) +transpose(transpose((echo(X,4,6) +transpose(X,7) ) ,-5) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(((transpose(X,-7) +transpose((X+transpose(X,7) ) ,12) ) +transpose((transpose(X,-5) |arpeggio((X|X) ) ) ,7) ) ,7) ) |transpose(X,-5) ) ,12) ) ,4) ) +transpose(arpeggio(echo(shuffle(shuffle((echo(X,4,6) +shuffle(X) ) ) ) ,4,6) ) ,7) ) +transpose(((transpose(transpose((step(echo((X+transpose(X,12) ) ,4,6) ,12) +transpose(transpose(arpeggio(step(arpeggio(X) ,12) ) ,-7) ,12) ) ,-5) ,-7) +transpose(transpose((((shuffle(transpose(X,-7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) |transpose(echo(transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ,4,6) ,-5) ) ,-7) ,4) ) +transpose((transpose(transpose((step(shuffle((X+transpose(X,12) ) ) ,12) |X) ,-5) ,4) +transpose((transpose(step(X,12) ,4) +transpose((arpeggio((X+transpose(X,12) ) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,12) ) ,-7) ) ,12) ) ,7) ) ,12) ) ,4) ) +transpose((transpose(shuffle((((echo(X,4,6) +arpeggio((X+transpose(X,7) ) ) ) +transpose((echo(X,4,6) +transpose(echo(((X+transpose(shuffle(X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4,6) ,12) ) ,4) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) ) ,-7) +transpose((((transpose(((X+transpose(X,7) ) +transpose(transpose(X,4) ,7) ) ,-5) +transpose(transpose(step(((X+transpose((X+transpose(X,7) ) ,12) ) +transpose(arpeggio(X) ,7) ) ,12) ,4) ,4) ) +transpose(arpeggio((transpose((X+transpose(X,12) ) ,-5) +transpose(transpose(transpose(((transpose(X,-7) +transpose((X+X) ,4) ) +transpose(transpose(X,4) ,7) ) ,-7) ,-7) ,7) ) ) ,7) ) +transpose(((transpose((((X+transpose(X,7) ) +transpose((shuffle(X) +transpose((X+X) ,12) ) ,12) ) +transpose(((X+transpose(X,12) ) |transpose(X,-7) ) ,7) ) ,-7) +transpose(transpose(transpose(transpose((((X+transpose(X,7) ) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,-5) ,-7) ,4) ,7) ) +((transpose(((arpeggio(X) +transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose((shuffle(X) +transpose(X,12) ) ,7) ) ,-7) +transpose((X+transpose(transpose(X,4) ,-7) ) ,4) ) +transpose(shuffle(transpose((X+transpose(X,7) ) ,-5) ) ,7) ) ) ,7) ) ,12) ) ,7) ) ,4) ) ) random seed used was 0
EXPR = ((echo((transpose(shuffle(arpeggio(transpose((echo(transpose(X,4) ,4,6) +transpose((transpose(step((X+transpose(X,12) ) ,12) ,4) +transpose(echo(transpose(X,-5) ,4,6) ,12) ) ,7) ) ,-7) ) ) ,-7) +transpose(shuffle(transpose((shuffle(echo(X,4,6) ) +transpose(((X|X) +transpose(X,7) ) ,12) ) ,4) ) ,7) ) ,4,6) +transpose(((transpose(transpose((((((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(arpeggio(echo(X,4,6) ) ,7) ) ,4) ) +transpose(step(X,12) ,7) ) +echo(echo((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4,6) ) +transpose(transpose(echo(step((X+transpose(X,7) ) ,12) ,4,6) ,-7) ,7) ) +transpose(transpose((step((X+transpose((X|X) ,7) ) ,12) +transpose(transpose(step(transpose((X|X) ,4) ,12) ,-7) ,7) ) ,-7) ,12) ) ,4) ,-7) +transpose(transpose(transpose((arpeggio(step((shuffle(transpose(X,-7) ) +transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) |X) ) ,12) ) ,12) ) +transpose(echo(arpeggio(arpeggio(X) ) ,4,6) ,12) ) ,-7) ,-7) ,4) ) +transpose(transpose((echo(shuffle(step(X,12) ) ,4,6) |transpose(transpose((step(echo(echo(X,4,6) ,4,6) ,12) +transpose(transpose((X|X) ,-7) ,7) ) ,4) ,4) ) ,-7) ,7) ) ,4) ) +transpose(echo(echo(((((transpose(shuffle(shuffle(((X+transpose(X,12) ) +transpose(transpose(X,-7) ,7) ) ) ) ,4) +transpose((((((transpose(X,-7) +transpose(echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4,6) ,7) ) +transpose(((((X|((X+X) +transpose(X,7) ) ) +transpose((step(X,12) +transpose(transpose(X,4) ,7) ) ,7) ) +transpose(transpose(transpose(transpose((X+transpose(X,12) ) ,-7) ,-7) ,-7) ,4) ) +transpose((step(X,12) +transpose(X,12) ) ,7) ) ,4) ) +transpose((transpose(X,-7) +step(step(X,12) ,12) ) ,7) ) +(arpeggio(((transpose(step(X,12) ,4) +transpose(transpose(X,-7) ,7) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ,12) ) ) +transpose(echo(transpose((arpeggio(X) +transpose(arpeggio(transpose(X,-7) ) ,7) ) ,4) ,4,6) ,12) ) ) +transpose(transpose(transpose(((step(X,12) +transpose(((X+transpose(X,7) ) |transpose(X,-7) ) ,4) ) +transpose(((X+transpose(X,-7) ) +transpose((transpose(X,-7) +transpose((X+transpose(X,7) ) ,12) ) ,12) ) ,7) ) ,4) ,-7) ,7) ) ,12) ) +transpose((((shuffle((X|X) ) +transpose(X,7) ) +transpose((echo(transpose((shuffle(transpose(X,-7) ) +(X+transpose((X|X) ,7) ) ) ,4) ,4,6) +transpose((step(echo(X,4,6) ,12) +transpose(((X+transpose(X,12) ) |transpose(X,4) ) ,12) ) ,7) ) ,4) ) +transpose(((step(transpose((X+X) ,4) ,12) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(step(X,12) ,12) ) ,12) ) +transpose(((transpose(shuffle(X) ,-7) +transpose(((X+transpose(X,12) ) +shuffle(X) ) ,12) ) +(transpose((step(X,12) +transpose(X,12) ) ,-5) +transpose(shuffle(arpeggio(X) ) ,12) ) ) ,7) ) ,7) ) ,4) ) +transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(shuffle(transpose(X,-5) ) ) ,4) ) +transpose(((echo((shuffle(transpose(shuffle(X) ,-7) ) +transpose(shuffle((X+transpose(X,12) ) ) ,7) ) ,4,6) +transpose(((step((X+transpose(transpose(X,-7) ,7) ) ,12) +transpose((((arpeggio(X) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) +(echo(X,4,6) |transpose(X,-7) ) ) ,4) ) +transpose(transpose(transpose(echo(X,4,6) ,-7) ,-5) ,7) ) ,4) ) +transpose(transpose(((transpose(X,-5) +transpose(X,7) ) +transpose((((X+transpose(X,12) ) |X) +transpose(((X+transpose(X,12) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ,12) ) ,-5) ,7) ) ,7) ) ,-7) ,7) ) +transpose(transpose((transpose((arpeggio(transpose((X+((X+X) |transpose(X,-7) ) ) ,-7) ) +transpose(transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,-7) ,12) ) ,-7) +transpose(transpose((((X+transpose(X,7) ) +transpose((transpose(X,-7) +transpose(transpose(X,4) ,7) ) ,12) ) +echo(transpose(X,-5) ,4,6) ) ,-7) ,12) ) ,-5) ,12) ) ,4,6) ,4,6) ,7) ) random seed used was 0
NOTE: Generated phrase was too large ( 13152 ) , it has been truncated at 5000 notes.
EXPR = (step(((transpose((step((((((X+transpose(X,4) ) +transpose(X,7) ) |step(X,12) ) +(step((X+transpose(X,12) ) ,12) +transpose((X|X) ,-7) ) ) +transpose(transpose((X+(X|(X+transpose(X,12) ) ) ) ,-5) ,12) ) ,12) +transpose(step(arpeggio(transpose((echo(arpeggio(X) ,4,6) +transpose(transpose(X,-7) ,7) ) ,4) ) ,12) ,7) ) ,-7) |((((step(arpeggio(X) ,12) +transpose(shuffle(step(echo(X,4,6) ,12) ) ,7) ) |transpose(shuffle(arpeggio(step(X,12) ) ) ,-7) ) +transpose(shuffle(((step(X,12) +transpose((arpeggio(transpose(transpose(X,4) ,-7) ) +transpose(((arpeggio(((transpose(X,-5) +transpose(X,4) ) +transpose((X|X) ,7) ) ) +transpose((X+X) ,4) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) ,7) ) ,4) ) +transpose(transpose(((transpose((echo(transpose(X,-7) ,4,6) +transpose(arpeggio(X) ,7) ) ,4) +transpose((arpeggio(shuffle(X) ) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(transpose(echo(transpose(X,-7) ,4,6) ,-7) ,7) ) ,-7) ,7) ) ) ,4) ) +transpose(((transpose(shuffle(transpose(X,-7) ) ,-5) +transpose(shuffle((((X+transpose(transpose(X,-7) ,4) ) +transpose((echo(X,4,6) |echo(X,4,6) ) ,7) ) +(shuffle(X) |X) ) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ) +transpose((transpose((arpeggio(transpose(transpose((transpose(X,-7) +transpose(transpose(transpose(X,-5) ,-5) ,12) ) ,-7) ,-5) ) +transpose(((((arpeggio((X+transpose(X,12) ) ) +transpose(((X+transpose(X,7) ) +transpose(X,-7) ) ,12) ) |transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(shuffle((X+transpose(X,12) ) ) ,7) ) ,-7) ) +transpose(echo(((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose((step(X,12) |(X|X) ) ,7) ) +transpose(transpose(step(X,12) ,-5) ,7) ) ,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ,-7) +transpose(step(echo(((transpose(((transpose(echo(step(X,12) ,4,6) ,-5) +transpose(transpose(step(X,12) ,-5) ,4) ) +transpose(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,7) ) ,-7) +transpose(transpose((transpose((X+transpose((X|X) ,7) ) ,-5) +transpose(step(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,12) ) ,-7) ,4) ) +transpose(X,7) ) ,4,6) ,12) ,12) ) ,12) ) ,12) +transpose((echo(step(arpeggio(shuffle((echo(((transpose(((arpeggio(X) +transpose(arpeggio(X) ,4) ) +transpose(arpeggio(X) ,7) ) ,-7) +transpose((step(transpose(X,-7) ,12) +transpose(((X|X) |(X+transpose(X,12) ) ) ,7) ) ,12) ) +transpose(step(echo(transpose(X,-5) ,4,6) ,12) ,12) ) ,4,6) +step(arpeggio(X) ,12) ) ) ) ,12) ,4,6) |transpose((((transpose(echo(arpeggio((((transpose((echo(X,4,6) +transpose(X,7) ) ,-7) +transpose((X|X) ,4) ) +transpose(X,7) ) +transpose(step(((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ,12) ,12) ) ) ,4,6) ,4) +transpose(transpose(echo(((step(shuffle(arpeggio((echo(X,4,6) |X) ) ) ,12) |((transpose(X,-7) +X) +transpose(shuffle(echo((X+transpose(X,12) ) ,4,6) ) ,7) ) ) +transpose(echo(transpose(step((X+transpose(X,12) ) ,12) ,4) ,4,6) ,7) ) ,4,6) ,4) ,4) ) +transpose(step(echo(((step(((X+transpose((X+X) ,7) ) +transpose(transpose(X,-7) ,12) ) ,12) +transpose(shuffle(X) ,4) ) +transpose(echo(arpeggio((X+X) ) ,4,6) ,7) ) ,4,6) ,12) ,7) ) +transpose(step((((echo(((transpose(X,-7) +transpose(transpose(echo(X,4,6) ,-7) ,4) ) +transpose(shuffle(step(transpose(transpose(X,4) ,-5) ,12) ) ,7) ) ,4,6) +transpose((transpose(echo(X,4,6) ,-5) +step(((X+X) +transpose(X,-7) ) ,12) ) ,12) ) +transpose(transpose((((transpose((X+(X+X) ) ,-7) |((transpose(X,-7) +transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(shuffle(X) ,-7) ,4) ) +transpose((((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) +transpose(transpose(X,-7) ,4) ) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) +transpose((echo(X,4,6) +transpose(X,7) ) ,4) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,7) ) ,4) ,4) ) +transpose((((transpose(transpose(arpeggio(X) ,-7) ,-5) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,12) ) +transpose(shuffle(arpeggio(X) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) +transpose(arpeggio((echo(X,4,6) +X) ) ,4) ) +transpose(transpose(((X+transpose(transpose(X,-7) ,12) ) +(X+((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-7) ,7) ) ,7) ) ,12) ,-7) ) ,-7) ) ,12) ) random seed used was 0
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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