please help with virtualbox

[Wojciech Puchar]

i use virtualbox on my own laptop just to run windows 7 from time to time. 
No problems.

But today i needed sound. I enabled sound in virtualbox as intel HD sound 
emulation. Windows automatically detect "new hardware". Everything seems 
fine. But anything i play from windows result in no errors and silence.

Sound under FreeBSD works fine without problems after i've set

dev.hdac.0.polling=1