2 channel mixer

[marcusHere]

I use addictive drums running on my laptop and it sounds great. The trouble is I play along to things a lot as part of my practice routine and addictive drums with ASIO means I can't play anything else on the laptop. So I want to play music from my mobile or another laptop and have both sound sources coming through my headphones. I was given a mackie mixer by a friend but it's huge (like 14 channels)and the sounds all sound like they're coming from the next room - really distant. Has anyone done what I want to do with a cheap little product like a 2 channel mixer or do you have any idea why the sounds are so awful through mine ? Thanks