Way back when I first wrote Euphoria, I used this goofy inverted value
system where the graph was 10000 units long, but an end marker at the
end was zero, and a start marker at the start was also zero.

I'm still not sure what I was thinking at the time, but it now uses
the same 1000 units long, any marker at start == zero, any marker
at end == 1000, just like the audio sequencer.