Originally Posted by RedEyeJedi
As far as i'm aware if you chain 2 Metric Halo devices together through AES they will be recognized as one and then I can just throw another 8 preamps in via ADAT on one of the MH interfaces.
If you want access to both MH interfaces from the MIO software, you need to daisy-chain them via Firewire; this lets you do routing, set bit depth and sample rate, clocking, etc.
To pass audio between the two, you can use AES or ADAT; in the setup you describe, it's probably easiest to have the 2882 be connected directly to your computer, and run the ULN-2 in through AES and the Steinberg via ADAT.
It would be a good idea to also make word clock connections on all three boxes. I don't know the Steinberg's preferences on this; if it can slave to one of the MH interfaces that would probably be best. I run two ULN-2s together, and slave the one connected to my computer to the second one; you might be able to go:
ULN2 clock out -> 2882 clock in
2882 clock out ->816 clock in
As far as the MIO Console being stable - yes, it is, but it's still software on a computer.
I don't think you'd gain anything by running a DAW as well; it would probably just increase your chances of trouble. MIO Console does support mirroring, so you can record to two drives at once, but if the MBP operating system has trouble it would likely affect both.
Backup is one of the tricky aspects of live recording; do a few searches here and you'll find many perspectives. A lot depends on how much room for error you have. On my 4-channel setup, I grab the SPDIF signal off each ULN-2 and capture them on handheld recorders. This means I have to sync them up if I needed the backups, but it's better than nothing.
I'm considering swapping out one of my ULN-2s for an RME UFX, which has onboard recording capabilities (to a USB drive). That would create a fully outside-the-computer recording path. If you're doing this sort of thing for money in can't-fail situations, it might be worth considering the UFX rather than the Steinberg (though it is a lot more expensive).