All the preceding Natural Canons were built from the Voice-leading A Swing
in which there was only one possibility of Orbit Line, the chain 3-2-1-0
which appeared in the 4 Performance Voices.
However, as we mix Metamorphoses, and possibly Voice-leadings,
the Orbit Lines of the Performance Voices will not necessarily be the same
and it seemed preferable to note them with the other characteristics
of each specific example.
And we have barely scratched the surface here.
To see the first presentation of these Metamorphoses chains