I was looking into this program the other day, it's used for routing audio, and I'd be using it for the OBS reason in this video. It might be possible to ensure vegas can' ever access your microphone. Software can autostart at boot. I haven't installed yet, if anyone is more familiar with it, they can chime in.
I think who's in control of how audio devices get shared or appropriated for exclusive use depends on how Vegas is configured. If Vegas is configured to use the Microsoft Sound Mapper (Preferences, Audio Device), then Windows can control it if the driver permits it to. The Windows control is in Settings, System, Sound...
But you can always bypass Windows control in Vegas by specifying explicitly which mic device you want Vegas to use to record in Preferences, Audio Device. I find doing that more convenient with external usb audio. Again, the audio device driver usually has settings on whether it will allow exclusive or shared use. Generally since I often pop in and out of Vegas to do audio edits to Vegas audio tracks with external apps like Sonar, Sound Forge, or Audacity, shared access to playback devices is required. But I usually keep mic access exclusive.
Unfortunately I don't have the controls I expect from VP The only options I have for audio recording devices are:
Microsoft Sound Mapper Microsoft Sound Mapper - Left Microsoft Sound Mapper - Right
None of the legitimate system input devices are listed.
I've recently gone through all my devices and set them to shareable at the system level. I'll have to keep an eye out for any new problems that causes.
I see now that if I select "Windows Classic Wave Driver" that I'm able to choose a specific input and output device. I'll have to try that and see how it affects stability as well as the takeover issue I'd been having