no sound via HDMI when playing in dx10

[pubbaa]

hello i'm using a hd3870, when i'm playing hawx in dx9 the sounds can be heard but when i switch to dx10 and play the game no sound can heard ,this happens with couple of other games when playing dx10 like farcry2,stalker

i tried disabling all the other audio devices and playing and, yet the problem remains,

[nightkhaos]

Is it possible for you to route the sound outside of HDMI as a work around?

[pubbaa]

yes i could route the sound to the motherboards Realtek sound card but just curious..why no sound is coming out through only when playing in dx10

p.s. my pets(three dogs in the house) have bit off the wires connecting the rear speakers