As example Collect Peak and Phase Measurements
But you need to use cables from accessories package for 4-ch analyzer.
For 2-ch analyzer there are right cables already in the box.
Yes there are special cables for respective channels or "fork" cables for AB and CD or an adapter with all BNC available.
I bought the 4-channel adapter with mine to avoid all the cable issues, at least initially. I will be buying other cables as I sort it out. It's a little confusing. Not sure why they didn't just add 2 other connectors on the box, so you had access to all 4 channels by default.
"The trend is your friend"