This is going to be quick! Not much to it!
If you want to know WHAT the driver is, go here: • What is SWB Audio Capture
This allows you to monitor what the driver is "hearing".
If you see a level meter bouncing here; you've got audio coming into the driver.
There's also the option to "Make default".
What this does, is when you enable preview, sets the SWB Audio Capture driver to be the default.
Let me show you.
Useful if you've an app you want to capture; that doesn'tlet you specify a device to output to (so you can't change
it to output directly to SWB Audio Capture), or you just want to me more lazy :) Either is perfectly fine!