Don't be silly. he doesn't understand, they'll know he doesn't understand, they usually have zero time. They BBC for instant can get people on air in less than 30 seconds - there is no time for this. Anyway - surely the problem is not at their end? He needs to provide the best audio he can so he just needs simplicity. They simply say to contributors "Have you got Zoom? Have you got headphones that are discrete? Can you turn off anything that might make a noise?" That's it. These people will not faff around reading or watching videos - it's just ridiculous. They might be shoestring or broadcast at their end. They may or may not have EQ - such a basic feature. Any noise tweaking will be presets not real adjustment. He needs to be self-contained. Most contributors in the UK who get sought repeatedly for opinions have their own little dedicated setups and learn how to use them. You made the assumption they were using software, we assumed, wrongly, you knew this for certain and knew what it was. You seem to have just guessed? Zoom has features that help reduce feedback in multi-contributor circumstances - the options are very limited. Just sort his audio at source and send them something clean. Forget trying to get the old guy to explain technical concepts, because if he tries, and they are technical, he'll be even more confused. never advise people without the skills and understanding to know what you are actually suggesting means - people soon sus blagging.