Stereo Input=Mono??

I'm new to Garage Band and macs in general. I was using Adobe Audition 3 on a Vista based laptop and have just switched to a Macbook (black)I'm using the same set-up as I was with Audition. A Behringer (Xenyx 802 with 2 mics) mixer with L/R 1/4" patch cables (for output) into a 1/4" Y to stereo 1/8" jack into the line input of the macbook.
I have the proper input set up in preferences and select Stereo input. When I record It shows two channels recording, but on the meters only the upper one is working. If I switch to mono, it shows 1 channel recording, but BOTH meters are now active.
Am I missing something??

This may be a dumb suggestion, but I have the same set-up, and sometimes when I am getting only half the signal, I just turn the line-in around a bit. That usually does it.
If that doesn't solve it, I would suggest using the RCA out straight to the line-in on the laptop (I assume your mixer has them) instead of the 1/4''-it could be something weird with your adapter.

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