Hello I've recently purchased Xenyx 502 mixer and I wonder how can I make 2 separate channels for my PC? Note that I can't use my front panel jack as it's shattered. Also can I connect a AMP DAC to this device? I think it would be okay if I would connect AMP/DAC through the USB and then connect the output of the AMP/DAC to the input of the mixer yes? Or won't it work? Thanks in advance