Ironically see my latest post
https://community.justinguitar.com/t/where-to-place-a-noise-gate-in-obs/263153/1
The Noise Gate both in OBS and in the signal chain or in my case AI aux send/return does the trick. What I would try is the Noise Gate on the Zoom Multistomp directly after the mic but I don’t have the right XLR to 1/4" jack cable…or given the plethora of cables I’ve collected, not had the patience to dig one out. CBA rules !
