One of my XLR cables arrived today! So when I got home from hell I went over to my Ubuntu install and got my DAC up and running. After some fiddling around with the settings I got it to transmit with success in TF2 and mumble. But I will be requiring a different XLR cable to plug into both the left and right audio channels. It’s been purchased and should arrive sometime next week.
But yeah, great hearing my awesomely terrible voice over on the linux side.