SWB audio and Zoom set up in OBS

I wonder if you can help me. I am running OBS version 29.1.3 on and Mac mini running IOS 14.1 with SWB as a virtual audio source.

I want to use OBS to stream a programme to YouTube. It will be myself and a guest on Zoom, and I will also play in video clips.

I have done something similar in the past, and I have used the ishowU audio interface, but I believe that that no longer works with OBS, so I have SWB now.

What I cannot work out though is the audio settings in 1) Zoom; 2) on my Mac; 3) in OBS and 4) In SWB.

I want to be able to stream both of us speaking, be able to mute myself so that when he is speaking my audio doesn't interfere with him, and also when a video clip is playing for us to be able to talk without it going through to the stream.

Could someone advise on the best audio configuration to achieve this? I'm sure hundreds of people must have done this over the years, and it's probably really obvious what to do, but I seem to be struggling to achieve it.

Thanks in advance.
 
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