Audio with Sierra Host and High Sierra Guest

[skis]

Firstly - thanks for all the great info here - it has been very helpful in getting things up and running.

From what I've read on the forums here there is some confusion on audio support with an OS X host and OS X guest.

Should it be working? I am running 10.12.6 on my host and 10.13.6 on my guest.

In System Prefs I see no audio inputs or outputs.

System Log attached.

Thanks!

[socratis]

From what I've read on the forums here there is some confusion on audio support with an OS X host and OS X guest.

As they often say in Wikipedia: [Citation needed]

00:00:01.378678 NumCPUs <integer> = 0x0000000000000004 (4)
00:00:01.664495 CPUM: Physical host cores: 4

You have assigned all your CPUs to the VM. The host is going to run low on resources, since VirtualBox cares about physical processors (cores), not logical ones (threads). See "CPU Cores versus threads" and "Why is it a bad idea to allocate as many VCPUs as there are physical CPUs?".

00:00:01.378869 DriverName    <string>  = "CoreAudio" (cb=10)
00:00:01.378869 InputEnabled  <integer> = 0x0000000000000000 (0)
00:00:01.378870 OutputEnabled <integer> = 0x0000000000000000 (0)

You've disabled the audio output! No kidding that there's no sound!!!
VM Settings » Audio » check both options for input and output, or at a minimum the "Enable Audio Output". Try it again...

The thing is that this option is enabled by default, so I'm not quite sure how come you were not aware that you purposely disabled the audio.

00:00:01.656136 Audio: Found 5 devices
00:00:01.656154 Audio: Device 'Built-in Microphone':
00:00:01.656169 Audio: Device 'Euphonix Monitor':
00:00:01.656182 Audio: Device 'Universal Audio Thunderbolt':
00:00:01.656195 Audio: Device 'Built-in Output':
00:00:01.656208 Audio: Device 'HDMI':

If you find a snag, try to reduce the audio options from the host, i.e. disconnect a couple of devices... I don't think that you will have an issue, I'm just mentioning it.

00:00:01.672300 SharedFolders host service: Adding host mapping
00:00:01.672308     Host path '/Users/shanekoss/OSXShared', map name 'OSXShared', writable, automount=true, create_symlinks=false, missing=false

There are no Shared Folders for OSX guests. You need the Guest Additions (GAs) for a guest OS in order to use the Shared Folders option. There are no GAs for an OSX guest. The Shared Folders entry is pretty much useless...

PS. For future reference, you should completely shut down the VM before grabbing the VBox.log. It's incomplete otherwise...

[skis]

Many thanks for the detailed response - I'll take a look at all this asap. Cheers!