ffdshow audio problem

[busko002]

I want to use the ffdshow audio filter to decode the audio form my mp3 divx movies. I want to do this becuase this way it is possible to mix the stereo sound to 5.1 sound(of course with not the quality 5.1 normally is. My problem is that i cannot get bs player use ffdshow audio for decoding. Always that standard mp3 codec starts and there's not much to configure in this codec. How can tell bs player to use ffdshow audio?
In the preferences, audio tab you can only tell wich codec to use to decode the ac3 files and set the output device. I have tried all the output possibilities and is didn't work.
I think it is some kind of priority issue, please help.

ps In the audio codec section under the win xp configuration screen i can't see the ffdshow is this normal, because if it was here i would be able the raise the priority

HELPHELPHELP!!!

thnx :evil: