I didn't think I could just chain all 3 keyboards, pedal and swell pedal together into 1 Midi input.....
As I wrote, "Can't you simply chain your MIDI devices..." . Not knowing your MIDI components it may or may not be possible. For example CMK/Fatar keyboards can be chained together with the pedalboard and swell pedal. So a 3/4 manuals console with a pedalboard and 3 swell pedals will only need 1 MIDI connection.¸
If you're using CMK keyboards/pedalboard simply daisy chain as follow. (Note that each manual *must* have its own MIDI channel - For example pedalboard = Midi channel 1, lower manual=2, middle=3 & top = 4).
Pedalboard OUT to top manual IN
Top manual OUT to middle manual IN
Middle manual OUT to lower manual IN
Lower manual OUT to Audio interface or MIDI interface IN. *
* If your keyboards also has a USB connector, you can connect Lower manual USB to computer.
Check the documentation of your MIDI devices to see what is possible.