To use multiple 828mkIIIs on a PC the first thing that needs to be done is to get the latest firmware and drivers from Motu. Driver version and firmware version must be version 1.06 or later. Once the firmware has been updated and the latest drivers have been install multiple 828mkIIIs can be connected via Fire Wire. Now you will see the different 828mkIIIs in the audio console and the Cue Mix Fx will allow the multiple 828mkIIIs to be routed as desired.