Tech question: What program can use 5 usb gamer headsets as inputs on one PC?

[mistermakebelieve]

I tried Voice Meeter, but it only has 2 inputs. I'm looking to hook up 5 inputs via USB, allow each to talk and head others, as well as audio I play, and anyone talking via Discord, Google Hangouts or a similar VoiP program.

Any ideas?

Thanks in advance!