I get noise when I combine left and right from the headphone output.

I need to combine the left and right channels of a Macbook Pro at the output connector.  When I build the cable to do this, there is significant static noise introduced.  If I break the short between left and right, the noise goes away.
(I'm doing this to put both channels of audio into a single side of a set of headphones, and I really don't want to buy a mixer.)

Eddie,
I just ran a test on my G5 Logic system (Logic 9.02) with an internal RME PCI 8in/8out Audio Card and I get perfect separation bouncing to a stereo audio file using standard panning. Click on one side and a couple of crunchy guitars on the other. Each side is completely separate.
So, it seems to point to your hardware unless you have some other audio routing that we've missed.
I'm re-doing my setup so I may try a couple of other tests as I go along.
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