I would like to submit an article to a journal that requires all references to volumes to appear in roman numerals before the page reference, e.g.:
William Shakespeare, Complete Works, III, 25.
For the regular 'volume' field, a simple
\DeclareFieldFormat{volume}{\RN{#1}}
can takes care of this. This does not affect \volcite
and related commands, however. I am far from an expert, and don't know how to go about this. Any advice?