I've recently added the ADAT "Option 1" card to my OctoPre and changed the Hardware Setup dialog in PT to reflect ADAT as the master clock, instead of Internal. Latency is getting to the point where it's audible.. like a chorus or flange Tested with microphone and line ins. Any ideas where to set the playback engine setting for best results?? Are there other settings or a way to generate word clock elsewhere and sync them both? Many thanks for this forum. My recording rig consists of the following gear: + PowerBook 15" 1.33GHz 1GB RAM + LaCie 160GB audio drive + External FW 400 bus for streaming audio + Digi 002R + Focusrite Octopre w/ADAT lightpipe out Assorted mics, keyboards, guitars etc.