Problems with the external control unit are just the first symptoms. After a while, the card stops working completely. This is a massive problem. The product is poorly designed and poor components are used. But ASUS refuses to acknowledge this problem.
Well I've finally solved my problem and strongly suggest you all try the same.
After months of discussions with Asus support they agreed to buy back the card at 100% of what I paid for it, as this card was nearly out of warrenty this was really appreciated.
I really liked this card with the external control and would rather that they could have released new firmware which I honestly think is the problem but at least I've got a refund.
It's really a shame because the way the control handled switching between headphones and speakers was great and so far I've not seen another card that has this feature,