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MOTU 8pre into M-audio 410 through optical cable

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.

DIY cable questions

I need a few new cables (XLR - XLR and XLR - TRS) and was thinking about making my own. I have been reading past posts and many people recommend makes of cable such as Mogami and Canare but I live in the UK and cannot find anywhere to buy them from. I am thinking about buying Klotz or Sommer cables with Neutrik connectors and have a few questions...

Recording volume problem. Is it mic/cable/preamp?

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I am using an SM57 to record my guitar cabinet. At random times during a recording the volume level will drop signifigantly (like -10 dB) and randomly return to its normal level. It generally does not stay between the two extremes. Also the line can get a little noisy when this happens (not a lot like a loud hum, but noticable enough where it is annoying).