Thanks for your reply,
I thought that would be an option, but was trying to avoid it as it seemed the USB way should work.
as I mentioned earlier - I’ll likely use my iPhone dialled into the same Zoom call for my vocal
microphone (iPhone headset around my neck for mic pickup)
then Helix into my laptop and guitar is the input for the laptop calling into zoom, and my headphones from helix will monitor my guitar tone and also be the audio output from laptop on zoom call (so those headphones will also hear all other participants).
sounds complex but should be ok