M-Track mk2 Sound issue

Hey Guys
im running on some issues with my M-Track mk2
i plugged it in and installled the driver but i cant hear anything through the headphonejack... i also cant play any videos on youtube with sound... they seem to play but the timebar isnt moving its stuck at 00:00 and the video is running in the background... when i use my other speakers it works just fine ...help
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