I've come in trouble trying to use both my jack 3.5mm headset and my bluetooth one at the same time. I've tried, under OSX 10.6, to create an aggregate device with the two previous ones, but in the Audio preferences panel the system says I've got no output controls on that device. I've then installed Soundflower in order to create a wrapper, but again the system says I've got no output controls on that audio too!
What's wrong with that?
Obviously if I select "Built-in" or my bluetooth device the system works like a charm... but one headset per time!