No doubt. It was not where I had sound in one earphone, which does indeed happen if you don't insert the connector entirely in some devices. Instead, I had the same channel in both ears. However, I notice that if I DO push the connector in halfway, I get the mono output for the other channel instead.
Are you supposed to need a special headset in some way? The circular connector is standard, but then I notice that there's another socket next to it for some reason that appears rectangular in shape. I'm using a standard headset.