I was trying to connect these two units together, M-audio being a main interface connected to PC through firewire. I connected MOTU 8-pre out into M-audio IN with optical cable. Pro Tools were running and froze right away. So I restarted computer, and can't seem to find any sign of MOTU connected on the PC. Pro Tools say that paths for inputs 5 - 32 are not found. And I can't create a new path for these inputs other than from m-audio 2 inputs.