virtualbox.org

Not sure W7 guest will discover right driver, what driver should be expected on a Windows 7 64bits SP1 if reverting to HDAudio with DSound on Vbox ?

The proposed defaults for the templates are selected so that the guest OS has already drivers built-in for that OS. So, if the default audio driver for a Win7-64 is the Intel HDA, then rest assured that there will be drivers built into Win7-64 for that audio card.

Do *not* make changes to the templates. They are selected from people that do this for a living, not a hobby...

Could it be a confusion for Audio driver between Speaker output and headphone output ?

While running Windows Troubleshooting assistant getting following result on both Windows 7 guest (32 and 64 bits)
Unfortunately Intel driver cannot be setup on Windows x64