Hopefully someone can help. Without the FM3 connected to the SPL Crimson interface SPDIF, I can select the Sample Rate in "Logic" or "Audio Midi Setup" to whatever I want for the Crimson interface (all of the internal Mac things are assigned to internal controls NOT the SPL Crimson). As soon as I connect the FM3 to the SPL Crimson via SPDIF, the Audio Midi Setup doesn't allow anything other than 44.1 from the drop down menu, in fact it's greyed out. This renders using SPDIF useless. This is an original SPL Crimson that uses Core Audio and is plug and play.