Paper buckles, not when moistened, but when the moistened area has dried
again.  Why?  It's as though moistening the paper releases internal
forces, allowing the surface area to grow.  Then it bulges slightly, and
causes ciphers at the tracker bar.

I've used a steam-iron cautiously to "tame the music", and it seemed to
help, perhaps because the water vapor permeates the region equally, bad
and good areas alike.  I've not ironed the dampened paper with a dry
iron, but this seems logical to try, too.  A surfactant, such as Kodak
"Photo Flo", might aid even-penetration of the moisture.

John Phillips proposes applying tension to the hanging web of paper, to
force it to become flat again.  That seems a good idea; more than 50
pounds tension should be possible without rupture if the edges are good.
Try introducing the moisture with the steam iron, too.  Don't worry about
overall-stretch in the roll.

Robbie Rhodes