Question What is the difference between Finalizer 96K and Finalizer concerning the optical I/O Is ADAT supported and how many channels can be supported Answer The Finalizer Express only has optical TOS inputs -  ADAT is not supported. The Finalizer 96K optical I/O supports TOS and ADAT signals. The format must be selected in the I/O page. However, only 2 channels can be processed, as the Finalizer 96K is a stereo unit. In that same I/O page, the channel pair to be stereo processed must be selected: ADAT 1-2, 3-4, 5-6 or 7-8. The maximum supported sample rate on the optical I/O is 48Khz on both units.