Huh, I dunno why I thought it had a mic. Maybe I was thinking of the NDS or something.

I'll try it with a headset later, looks like a regular jack. It's the same controller I'd used on my other machine, so no other controllers unfortunately. But that machine is from '98 and the t40 is from like 2003.

Confirmed, audio through a headset plugged into the dualshock 4 works. This is very silly.

https://youtube.com/shorts/YDh2NpSaE_Q?si=IBzAe2EiOtf5Bqau <-- quick video of it, forgive the lack of quality. realized at the last second that I had to cut it before it played copyrighted audio 🤣

It's quite amazing that this also works with DOS games. I can confirm that these work:

Lion King
Doom 2
Jazz Jackrabbit
Commander Keen 4
Rayman
MDK

The only thing is that I'd like to use the d-pad for moving instead of the thumbstick. Does anybody know if they can be swapped? Perhaps editing the driver or using a 3rd party tool?