Mic Issue

Just set up new gaming PC with ROG b450 gaming Motherboard. All systems go except mic through Astros A10 headset. I’m using a splitter to connect to the back and have tried endless suggestions like Windows settings, download/install of Realtek Audio, and confirmation of mic being enabled in MB...

i like know which is best 1080ti graphics card, among msi, gigabyte,zotac... etc i have i7-7700k with gigabyte gaming 8 motherboard, i am using 4k monitor waiting for reply.....!!!