ive been thinking about getting the Alesis MultiMix 8USB Mixer and i was wondering if you could use that with pro tools or if you need that m box thing. thanks
You need Digidesign hardware or the M-Powered series from M-Audio. The MultiMix won't work.
check out UG Recording Video 1.
I tried to explain in the video that ProTools isnt needed for smaller studios (which is most studios IMO) and that you need proper hardware to run it but with that youtube 10 minute time limit I could not fit that in.

Point is your MM8 will not work with ProTools but you can use it with Reaper or most other sequencers.

BTW that interface/mixer isnt going to track separate files, it will mix to a stereo output as explained in my video.....