Afaik combining record output (MIDI) and overdub is not possible (currently), unfortunately.
I ran into the same limitation at some point:
https://forum.cockos.com/showthread....83#post1324883
edit:
Quote:
If this is not possible I am thinking that this would call for a feature request.
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I'd be up for supporting it.
(not sure if there's an existing one already though).
edit2:
You may be able to work around it by using virtual MIDI (loopback) ports (e.g.
loopMIDI), by sending it out to a virtual port on track A and back in on a virtual port on track B (where you then can use record input instead of output).