Tezza1971
Basically I want to create layers of instruments all playing the same notes.
This is the clincher. Ordinarily, we would not want to do this, but occasionally, we might.
There is a way, and the cloning idea was very close.
First, lets take a quick look at some of the stuff that isn't working for you.
"Enable MIDI Output" is a special scenario, and most synths do not support it.
The only time I've really seen it in use was a VSt that created patterns from notes in the track, and spit those patterns out to a synth on another track.
The drum map can send individual notes to different synths, but it cannot send all notes to multiple synths.
Back to the original question.
Clearly, you cannot send the output of one MIDI track to several synths.
Copy/Paste will do what you want, but you MUST click one very important option:
Link to Original Clip(s).
Select and copy the clip in your original MIDI track. Nothing special yet.
The key is in the Paste menu.
I don't have MC6, so I'm not sure which of two variations you will see.
Now, Paste the clip into another MIDI track.
You may see only Paste, or you may also see Paste Special.
If you see Paste Special, the linking option will be there.
Otherwise, it will be under Paste.
In either case, be sure the Link option is checked.
When the clips are linked, they will have a dashed border.
If you edit notes in any linked clip, the change will be reflected in all of the linked clips.
You will still need a separate MIDI track for each synth, but this approach will allow you to simultaneously make the same edit to all of them.
Give this a try. I think you'll like it.
Note: When learning a new procedure, I highly recommend lots of "Save As" at critical steps. It makes it easy to go back if you get tangled up.