Audio stream in mono

Any one can help me?
I am current streaming a radio station in FM stereo signal,
using Flex AC3 for the flash broadcaster, the sound card we use as
the audio is 7.1 channels (CreativeSound Blaster),
we plug in the FM stereo feed to Line-in on card, and the
stream only provide MP3 mono, what I done wrong here? any help is
appreicated here.
regrads, MC

i don't know about flex, but flash has an audio quality
setting (in the publish settings) that could cause that
issue.

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