I've been having trouble even finding out if what I'm looking for exists.
I have two sources. One is audio only, and the other is audio with voice chat. The headset I'm using has an inline mic.
It seems that I'd want a Y adapter which has one 3.5mm 4 pole female end, and two 3.5mm 4 pole male ends (or at least one has to be 4 pole, as one source is audio only).
All I can find anywhere are Y adapters with one 4 pole female end, and two 3 pole male ends. If I understand correctly, that will allow me to hear the audio from both sources, but nobody will be able to hear my mic.
Any help finding what I'm looking for, or alternative suggestions in accomplishing the same thing? The only output on both devices is via 4 pole female 3.5mm jack.