I believe I have discovered the cause of the problem. Your prompting me to look at the Open Issues for VirtualBox pointed out that I was on V5.0.0 and when I went to the Downloads Page, V5.0.2 was currently available. VirtualBox will send a push notification when the team indicates and important release is available and is displayed when you start VirtualBox. Although 5.0.2 is generally available, they did not mark it for Push Notification. I upgraded to 5.0.2 and also followed through with a process called Install Guest Additions, that led to more serious errors. The Guest Additions Scripting installs custom support for a variety of system dependent things including advanced Video capabilities like Screen resizing. I had noticed this issue before but was not zoned in on it because it is a critical failure for the new KDE Distro and not with the other Desktops. I decided to backoff to VBox V4.33 which is the latest release for V4 of VirtualBox. Spot checking all of the 15.10 Distros having this audio problem, just getting into alsamixer and adjusting the Volume Slider, they seem to work correctly with VBox V4.33. The VirtualBox Team had a V5.0.3 release that hasn't been finalized but is available for users to manually install. I have not tried that release to see if the Audio issues are resolved. I need to turn my attention to reporting both this Audio Issue and the Video issue to the respective Virtual Box teams. I believe you can mark this issues as Closed. Thanks for all of the help in getting this issue sorted out. On Fri, Aug 21, 2015 at 7:00 AM, Raymond