Multiple Midi controllers one channel Ableton

[AudioWeston]

Hey again

So I currently have 3 MIDI controllers

an MPD32
a Novation Remote SL61
an Alesis Trigger with pads

Now what I want is one drum track to be controlled by the MPD32 and Alesis Trigger but NOT the Novation Remote.
How can I do this?
I can only see on i/o to select 1 Midi controller not multiple.

Cheers

[Dragonbreath]

On the drum rack track, select the MPD32 as your midi in

Create a "dummy" midi track, select the alesis controller as the midi input, route the output of that dummy track to the drum rack track.

That should work