CentOS6 And Virtualbox Audio Problem

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host: CentOS6 64bit (dell desktop)
guest: windows 7 64bit virtualbox: 4.3.30

problem: host has audio but guest does not. i.e. when virtualbox comes up, it says:

No audio devices could be opened. ErrorID: HostAudioNotResponding

#lspci -nn | grep -i audio
00:1b.0 Audio device [0403]: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller [8
086:1c20] (rev 04)
01:00.1 Audio device [0403]: NVIDIA Corporation GF119 HDMI Audio Controller [10de:0e08] (rev a1)

Pulse audio and Alsa installed on the host.

trying these settings have not worked so far letting me have audio on the guest:

Host Audio Driver: OSS,PULSE,ALSA
Audio Controller: Intel HD

I am not seeing any audio-related errors in virtualbox log.

lot of time spent on this so far; any idea as what to do next will be greatly appreciated.

thank you, F-