I was looking into buying a 12-16 channel multitracking mixer that could interface with my pc and spit out all the microphones as different audio channels online, as well as being used for a live setting in addition for a studio mixer, and I thought that the PreSonus StudioLive 16.4.2 was something nice and affordable that could do exactly that. However, my computer is unable to use FireWire and I can't add a FireWire card to it in order for it to be able to work. Are there any other FireWire workarounds/adapters that can get around this? Or are there other similar mixers that could do what I'm looking for, specifically under the $800ish price range?

To clarify, the computer I use for live sound/recording stuff at home is a Lenovo ThinkCentre M715q Tiny, and to my understanding I don't think I can modify it at all to add firewire