The OPTO-X is an alternative extension board for the HDSPe MADI FX triple MADI card with full functionality. Like the standard extension board it comes with Word Clock I/O and a D-sub connector for MIDI and AES I/O. The standard coaxial MADI I/O is replaced by an optical MADI I/O. Using the OPTO-X the HDSPe MADI FX then has three optical MADI I/Os