Example:
ATI is default device in Windows 7
I can controll volume
Switching device with above plugin to ASUS
Changing volume shows OSD, but still changes volume of ATI not ASUS
But things got a bit worse, with this patch. After switching the device the OSD did not work properly anymore and the issue still remains. The OSD for volume info only popups eratically.
Sorry for the short description. Not much time currently. Hopefully I will find more time to also support logs.
I thought there were some changes made for MP 1.3.0 Alpha. So you maybe should test with the MP 1.3.0 Alpha testinstaller and see if you have the same issues.