mixvibes u-mix44 - no signal headphone

HELLO EVERYONE!
I bought MixVibes U-MIX44. My VISTA SP2 automatically installed drivers and said that sound card is ready to use. OUTPUT signal is ok - loudspeakers are playing but there is no HEADPHONE signal ! I checked CONTROL PANEL -> SOUND -> LOUDSPEAKERS -> PROPERITIES and HEADPHONES VOLUME is 100... :/
What is interesting ! - HEADPHONES are playing some system sound when i push test button in LOUDSPEAKERS properities ?
THANKS FOR HELP
I bought MixVibes U-MIX44. My VISTA SP2 automatically installed drivers and said that sound card is ready to use. OUTPUT signal is ok - loudspeakers are playing but there is no HEADPHONE signal ! I checked CONTROL PANEL -> SOUND -> LOUDSPEAKERS -> PROPERITIES and HEADPHONES VOLUME is 100... :/
What is interesting ! - HEADPHONES are playing some system sound when i push test button in LOUDSPEAKERS properities ?
THANKS FOR HELP
