Ensure that Copy & Paste DAW in Revoice Pro's View > Settings menu is set to Studio One.
Select the regions to be captured in Studio One either by...
(a) Clicking the first region, and shift-clicking subsequent ones (the first to be selected becomes the Guide, the rest the Dub tracks).
(b) Highlighting the regions by dragging across them (the top track becomes the Guide).
In Studio One, Copy the selected regions to the Clipboard