Sorting by rating -> title

Hi,

I’m trying to sort my category pages by rating -> title.
This because I want to show posts without a rating sorted by title.
However i cannot get this to work and can’t find anything on it in the documentation/topics.

For making the category sort by rating I altered the query in the following way:
$query->set( ‘gdsr_sort’, ‘rating’ );
$query->set( ‘gdsr_multi’, 2 );

So far I’ve tried:
$query->set( ‘orderby’, ‘title’);

and:
$query->set( ‘orderby’, ‘gdsr_sort title’);

and:
$query->set( ‘gdsr_sort’, ‘rating title’ );

All without succes, does anyone have an idea on how to do this?

http://ww.wp.xz.cn/extend/plugins/gd-star-rating/