Agregate MIDI very urgent

[mcmaklin1]

Please please I need urgently

I have 3 keyboards: Axiom and O2 and Korg

I have created one piano midi instrument.
I want to control piano using both Axiom and O2 (will by played by 2 persons)

Korg I want for a different MIDI instrument

How to create such agregate MIDI (Axiom and O2 grouped)
THere is no way to select 2 inputs at the same time, there is only option to choose all midi ins

thank you

[chapelier fou]

-create 2 tracks : one with axiom as an input source, the other with the O2. Monitor them to IN or ARM and auto depending on your needs.
-create another track. Monitor to IN. And put your instrument in it.
-In the 2 first tracks, select the third track in the output section.