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Windows 7: VirtualBox - "Some audio devices (PCM_in) could not be opened"

02 Mar 2012   #1

Windows 7 Home Premium 32bit SP1
VirtualBox - "Some audio devices (PCM_in) could not be opened"

I'm trying to use VirtualBox however whenever I start any virtual machines I am presented with this message:
"Some audio devices (PCM_in) could not be opened. Guest applications generating audio output or depending on audio input may hang."

Name:  VBOX Issue.PNG
Views: 24
Size:  55.4 KB

This happens regardless of which guest operating system is installed or even if there is no guest OS.

What does this message mean? How can I stop it from appearing?

Thanks in advance!

My System SpecsSystem Spec

15 Jan 2013   #2

Windows 7 Pro SP1 64 bit

Hi Caleb,
have you figured out that problem with VirtualBox? I'm having the same trouble and it's driving me bonkers.
Please if you figure anything out let me know, and I'll do the same.

Thanks man,
My System SpecsSystem Spec
23 Jan 2013   #3

Microsoft Windows 7 Ultimate 64-bit Service Pack 1

Under settings,do you have audio enabled,and if yes,which audio controller is assigned?Every single time i install 7 or XP,i am assigning ICH 97 and download Realtek's audio drivers,
My System SpecsSystem Spec

23 Jan 2013   #4

Windows 7 Pro SP1 64 bit

Thanks PTBG!
I'll check that out as soon as I get home and report how it works.


My System SpecsSystem Spec

 VirtualBox - "Some audio devices (PCM_in) could not be opened"

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