playlist and categories

Hi
I made a page using views with the view type being Audio:XSPF/M3Uplaylist and with a filter of node type 'audio'. It correctly displays all the audio nodes on my site into the xspf flash player, nice!
I also have in place a few categories, such as 'Genre' and some associated vocabularies, such as 'Rave', and these categoreis have to be selected when uploading an audio node. I therefore presumed i could make an exposed filter in my 'view' for this category and when the user navigates to the view, they could refine the playlist in the flash player using the exposed filter.
The View works fine, the xspf player is at the bottom of the page with the categories 'genre' and a drop down list of terms along with the search button.
It nearly works but ..... instead of displaying a refined playlist in the player, it displays all the audio nodes, if any of the category terms are true.
To explain this clearer, if i have two categories; A, B and and each of those have terms a1 a2 , b1 b2 respectivly, when i sumbit an audio node, i have to select 1 term for each category. say i submit three audio nodes wuth combinations a1/b1 , a1/b2 and a2/b1 when i use my search view and try and refine by category terms, all three audio nodes are in the playlist, apart from if you select a2/b2 of which there are no result and it correctly displays nothing in the list.
If i change my view type to teasers or list view with a field, all works wonderfully as i expect, you can refine the list using the exposed filters and the results change accodingly. So i must be missing something.
I really want to be able to use exposed filters in my view to pass a playlist to the xspf player.
Is it possible?
what am i missing?

please see attached screen grab of my 'view'

Thank you