Hi,
the only available driver for downloading is Link Removed. Directing Windows to upgrade from the downloaded C-MediaCM6501_Audio_V60070207_vista.zip gives the same "native" Windows driver.
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Well, when carefully looking into "C-Media CM6501 Lik Sound Device" setting ... isn't it just USB-audio ? This could explain why is the audio-jack output silent....Also, setting pannel says no info about connectors.