An unwanted comma

I'm using jurabib with jox, but have found that, with the use of
\renewcommand{\bibatsep}{,} (or with its omission) an unwanted comma
appears after the volume title and before the publication and year
details which are in parentheses. Using \renewcommand{\bibatsep}{}
deletes the comma between the article title and the journal title, and
between the title and 'in' separator for incollections (both of which
I need).

I suppose I'm asking for a way to distinguish between volumes and
articles/incollections.

If a clean solution is not available I would be grateful to learn
about any possible hacks.

Many thanks.

Owen

-----------------
\documentclass{article}
\usepackage[oxford=true, authorformat=allreversed]{jurabib}
\jurabibsetup{%
authorformat=and,%
titleformat=italic,%
citefull=first,%
super,%
commabeforerest=true%
}%
\bibliographystyle{jox}
%\renewcommand{\bibatsep}{} %punct after title
\renewcommand{\bibbtsep}{in }
\renewcommand{\bibpldelim}{(} 
\renewcommand{\bibprdelim}{)}




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