Important: If your source or destination port uses a MIDI Time Piece, then you must specify MIDI Time Piece in the MIDI Setup dialog box (Setup menu) prior to using the Change Ports dialog box. Keep in mind that installing OMS will allow you to custom name each of the 8 available ports on the MIDI Time Piece. Referring to ports by name, rather than number, enhances the overall level of intuitiveness within Metro and other OMS compatible applications.