^^^
You need to get a second sound card (use different brand/manufacturer - I mean don't get 2x creative Hi-Fi or something, make sure they are different chipset, otherwise driver will work for only 1 - its issue I has with my system... I have 3 sound cards by the way, 1 for DCS, 1 for headset (Ventrilo/TS) and 1 for SimShaker)