I'm sorry, I don't know how to proceed with this issue. Early on, you asked for Verbose Logging from Virtualbox. I supplied the Machine Log for the failing Guest and I knew Verbose was probably Defaulted to Off. Since then, I have found the commands to change the running machine "VBoxManage debugvm" however the VirtualBox Documentation is weak on descriptions and examples of how to turn on the Verbose logging for Audio issues. I can see in some of their supporting Code Snippets that Group 2 Logging maybe applicable. I cannot find any "VBoxManage debugvm" examples controlling setting verbose by group. I am also having difficulty in understanding what coding changes needs to be done in order to address your last couple of updates. So here is the difficulties I am facing. I would feel more comfortable if we pursued tracing the problem rather than making code changes. If you are unable to direct me toward specifying the correct commands to accomplish this then I can try getting help from the VirtualBox Forum site. I will say they have not been very helpful so far regarding this issue. Short of these two options, I am prepared to drop the issue entirely and someone else with the same problem and is better up to speed with working with this code and these tools can pickup the effort. On Tue, Sep 1, 2015 at 12:07 PM, Raymond