Hi there. I have about 215 PDFs where the output (from a music engraving program) was of a smaller size (6.875x10.5), outputted onto 8.5x11 (which is the size I need). The problem is that the output is left-aligned and not centered. There is no way affect this in the source software. Is there a way automate the centering of the music on 8.5x11 PDFs, in a batch? Thanks.