I tried connecting a set of earphones (4 pole) to the headphone jack through the control pod, directly to the headphone jack, as well as the front connector jack. Each time I test the sound I get both left and right channels playing in each ear. This does not happen with my headset that uses a 3 pole jack. My Realtek onboard sound can support 4 pole jacks (it plays the left channel in the left ear and the right channel in the right ear). The Phoebus, a discrete (and expensive) sound card, does not? What gives?
P.S. I am testing the 4 pole jack connection in anticipation of buying a new headset that uses a 4 pole jack (it has a built in mic). Also, I'm looking at the Astro Mixamp Pro TR to connect the headset to my console, and that requires a headset with a 4 pole jack. This is why I'm asking about 4 pole connections.