audio skype ndi

hey guys, I'm trying hard to find why the sound is repeating when i add a guest via skype Ndi. the guest sound is echoing and repeating even he uses a headphone and i use a headphone too>>>please help me and sorry for my English. video link here to understand the problem sound repeating and...

In which version of OBS for Mac, can I have individual audio mixer setups for each scenes? I need to mute just one NDI source coming from Skype, in a scene with duplicated audio from other NDI sources, but when I mute or bring down the fader, it happens in every scenes. I mean, NDI Skype audio...