Streaming with Soundflowe/Blackhole records internal microphone as well

Hello everyone,

since a month a started to face a difficulty, that I can't seem to resolve.

I'm streaming music to an online radio via butt (broadcast using this tool) and it also started to send my internal microphone recording as well. Better explanation is, that before it when streaming music, it only sent the actual music, but now if I talk, it sends that too, and every background noise I'd make during DJing, that I don't want to.

I've tried both blackhole and soundflower, tested on a MacBook Pro and Air (using High Sierra, and Big Sur on the Air). My settings are following the usual (multi output device in midi settings, and in rekordbox DDJ400 out + the multi output device). 

Does anyone else having this issue, or have a solution for me? Rekordbox is updated to the latest, as well as with both High Sierra and Big Sur on both devices.

(if needed I can post screenshots)

Thanks in advance and best,

Samu