I got my UR44 recently but I have this strange issue while running it on imac. When playing sound just via itunes or vlc or daw all seems fine, then I turn the volume all the way down on all outs however I can hear the sound coming out of speakers and both headphone channels. It’s very very quiet but it is present. Any reason why turning volume all the way down doesn’t do it’s job? Could it be drivers issue?