answer:I’m a bit confused; isn’t the presonus an A/D converter in itself? How many simultaneous inputs are you trying to get here? How many mics are you trying to get going at the same time? That will determine the connectivity. Why are you using the mixer? For monitoring? Submixing? Are you using ProTools for your DAW or another app? As you already know the 002 has 4 switchable mic/line preamps, 4 additional line ins, and the ability for 8 more channels via the ADAT lightpipe. If connecting via lightpipe, you need to set the software to read the presonus as the optical, and as the sync master. Do you know how to set that part up? Lastly, the mixer? Why are you adding a mixer? Would it be for input fader control during tracking? My recommendation off the top is to maintain as simple a signal path from your Mic Preamps to your front end (the 002) as possible; any mixer you add in-line is going to add line noise (albeit a minimal amount, it adds up over many tracks and overdubs). Describe your setup and goals for tracking and we’ll see what we can suggest for your signal chain solution.