Found another small issue... When testing the last 2 releases, I noticed when done and I removed the i/O filter from the source, it defaults to none for output.
For my setup, windows mixer has obs in system channel, so when you play video through obs, its "audio meter" runs in the system channel.
So when removing the filter, it should default back to its "default output" rather to none. I can still hear the audio, but it effectively comes from nowhere, and cannot mute it or adjust it with my Beacn external device, and no idea how to restore it.