[Lawrie]

Hey Mike,
thanks for clarifying things.

Needing to have a "song" that uses all the pages in the PDF in order for image correction to modify every page makes perfect sense now I think about it.  Still learning this wonderful product!

The code change to replace modified pages rather that replace the entire PDF when a subset is used is a good correction.

FWIW, it only took a few minutes to do the entire PDF - perhaps 4 or 5.  I was expecting a much longer wait but it was exporting pages at a rate of maybe 3 or 4 per second.  The correction process was slower as you would expect, maybe 1 1/2 to 2 per second, and stitching the PDF back together seemed to be almost instant.

FWIW I'm using an Onyx Boox TabX

Again, thank you.

PS  Just to be difficult, I'm not sure anything actually changed...  I'm going to recheck my process to make sure I didn't miss anything.