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Now, if I add an instrument track I can select the relevant "Instrument Output" channel (1-16) from "Instrument Channel" drop down menu using the new instrument (in this instance - Midi Out) as the "Instrument Output".
As you can see in the image. The Drumbrute has been assigned the "Instrument Output" - "MIDI Out" and the Midi Channel has been set to CH2, which I set as the global MIDI channel in the settings of my Drumbrute.
You can also see the Elektron Cycles has been assigned the same "Instrument Output", but with each of the 6 machines being assigned separate MIDI channels (CH3, CH4, CH5 etc...) which again I assigned in the setting of the Elektron.