Yes, he has tried PulseAudio panel or whatever the panel is in MX on XFCE that controls all of the audio levels for the different devices. I’m not sure, but I read something on Level1Tech’s forum that said that the newer headsets that are trying to do crazy things with surround sound emulation and have a USB interface have a lot of their sound effects built into a special driver for Windows. I believe that Razer does offer an audio driver that works in Windows that can allow you to boost the mic volume. The mic volume is the real issue here. He has used the headset just as headphones, and I have as well, and the sound is wonderful in the headphones even without some of the wiz bang effects that might be there in the Windows audio driver. The mic when he has tested it in a number of different places like Discord and Audacity registers very low decibels output. In Discord under the Audio settings the lights never get much past the halfway mark on the meter, and that is with the mic turned up to the max setting in PulseAudio panel which is I think 150%.
We have read all of the Discord posts about adjusting the mic volume in Discord, and we have tried all of those tricks, but the mic itself seems to be the issue, with the way it connects as a USB sound card in Linux. There are not other places where you can pump up the mic gain to make it better.
Thanks @SquirrellyDave for the suggestion of looking at HyperX stuff. Are you using a HyperX headset with USB or separate mic/headphone jacks that plug into your sound card 3.5 jacks?
I should mention that he has had issues with a cheap (unpowered) dynamic mic attached to an M-Audio USB interface. He has to boost that mic signal to get a decent sound in Discord or other audio programs as well. If he boosts the gain too much than the dynamic mic picks up too much background noises. He has used a USB powered condenser mic which provided plenty of sound, but that also tended to pick up too much background noise as well. He was hoping that a headset mic might be a better option.