This applies to the current Saffire Range
If you are experiencing trouble getting audio through when using optical S/PDIF on the Saffire Pro 40, try enabling the "Use ADAT as optical S/PDIF" before you set the sync source....
1. Enable "Use ADAT as optical S/PDIF"
2. Change Sync Source to S/PDIF
3. Select S/PDIF 2.1 or 2.2 as a source