Thanks, but that's not quite what I had in mind.
The MIDIMAN MIDISPORT 4x4 has four separate PORTS meaning there are 4 MIDI IN & 4 MIDI OUT connections. For example, I need to send a MIDI program change command to a device on CHANNEL 3 which is connected to PORT 4 on the MIDISPORT. How do I indicate which PORT I want to send a MIDI program change command to ?? I'm not using a DAW or a sequencer. This is for a live rig.