Hi i bought an apollo twin x duo heritage edition. i connected it to my laptop and installed everything. however i dont know how to use it hahahah. i connected my headphones to the interface and the interface to my macbook . how do i choose the interface as output? i went into settings and changed it to the iterface but for some reason it doesnt work, when i play a youtube video the video stays frozen eventho it plays, very weird, can someone please help out, ty