How to send multiple MIDI channels to the AU Instrument

I want to have a one instance of Drambo in a project and few ExternalMIDI tracks sending MIDI data to different channels in Drambo.
My setup currently is NS2 ExtMIDI tracks are sending data in channels 1 and 2 to the AUM which redirects it back to NS2 Drambo track.
The problem is that eventually all notes are merged to the channel 1.
Is there a way to make it work in NS?

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