I bought this Sennheiser U 320 headset because Sennheiser advertises a special button called Chat. As you can read on the Sennheiser site (http://nl-nl.sennheiser.com/gaming-h...c-stereo-u-320, it would allow to independently change the ingame games and the Teamspeak sound. But it does absolutely nothing. The ingame sound control works fine but there is no separate changing of the Teamspeak chatter of my mates.

I'm using this headset on my iMac - and with Bootcamp also.

Is Sennheiser at fault? Is Teamspeak at fault? I would hate to return this headset but a working Teamspeak controller is high on my wishlist.