A keyboard short-cut to retreat or advance in all document panes at once has been requested several times. Most recently on the support board:
This request suggests simply Page Up and Page Down, but this has meaning in the Targets tree control and the Document Grid (and Results Grid). So, it will need to be ctrl-Page Up and ctrl-Page Down. This can be added to the View > Chromatograms submenu with the ctrl-Up and ctrl-Down shortcuts for Next and Previous Replicate.