I’m frustrated

M-Track II doesn't work on my Mac

Hi, I just bought a M-Track II and I want to use it with my new iMac with El Capitan 10.11.5 OS. the iMac recognize it, I set the input and output preferences on M-Track but it doesn't work, I can't even launch a song in iTunes, if I press play the song doesn't start, if I press play on YouTube, the same! What I have to do?
Thank you
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