Issue with audio routing

[Ye Olde Curmudgeon]

Hello there and friendly greetings!
First of all, please forgive my lack of knowledge and proper lingo, it's not much time that I've started to use OBS.

I am not using any third party software like VoiceMeter or similar, I just installed the Monitor plugin from Exeldro.

I am also using MusicBee as source of background music.

The problem I am having is that, despite MB (MusicBee) is working perfectly during the stream (or during the local recording of a video), I cannot find a way to eliminate the audio from the headphones.
Let me explain a little bit better: the audio of MB works as I want in OBS. If I watch a video, there are no issues, everything is as I intend.
While I record the video (or while I stream) I hear the MB audio in my headphones, no matter the volume I set for it in OBS. I can only control the volume of MB in my headphone via MB volume control, not via OBS.

I hope I made myself clear enough...
How can I exclude the audio of MB from my headphone while retaining the functionality and the levels in OBS so that I can record it / let them heare in live?

Please feel free to ask whatever you might need, I know I am a n00b...

 

[PaiSand]

Issues with a third party plugin is better to ask on the discussion section of the particular plugin page, so the dev of the plugin and other users of this plugin can see it.