Connecting HiFi to QC

What is the cleanest way and best setting to connect a hifi component and send the output of a CD, MD, tape rcording to QC? At this time I have a low buzzing background sound that cannot get rid of. Thanks for any suggestion.

I have resolved the problem by setting the noiscanceling off on output 1 and 2. Strange though…

Sounds like a ground loop potentially. I would try by disabling the noise gate and then use the pull-down I/O menu, chose your input and see if switching the ground-loop helps at all. The other thing is make sure the QC is getting line level signal from your CD, MD and or tape recorders.