Apache Solr Facet Builder Can't Facet On Views field:value?

I have been trying to build a faceted search UI using Apache Solr Facet Builder and have some questions which I would hugely appreciate any response to.

First and foremost, I really need to figure out whether what for me turn out to be dead ends I have been running into, may actually be by design.

Module documentation says that if a facet display is working in the Views 2 preview that facet should work in a block as a Solr search - "If a node appears in the view display it will be categorized under that facet."

I can build facets using Views 2 but they do not correspond exactly to the View I create-I can facet on a field but not on it's value. SHOULD I be able to facet on a field:value via a Views facet display?

If I should be able to use Apache Solr Facet Builder with Views to facet on a field:value via a Views facet display, can anyone inform me whether there is any reason why a View I can create which results in a set of nodes filtered on Type:Audio and say, Genre:Blues, would only result in a facet on all Audio nodes which have a Genre field?

Thanks so much for any insight.