BTW in regards to the optical input stuff Matt from Focusrite said this in another thread in case ya'll missed it...
"Glad to hear you are all enjoying using your Scarletts and Saffires with X1.
Beepster: In regards to your question about using the optical input with the 18i6, you should be able to use it with any device that has an ADAT optical output. The only thing you have to do is plugin the lightpipe cable to both devices and set your Sync source in MixControl to ADAT. You will want to set the device sending the optical output to internal clocking. It really is that easy.
Matt Pliskin // Focusrite Technical Support"
Hooray!