Thanks for your response.
From what I have experience and what I have read in the manual, one instrument is on Midi channel 16 and the other is on midi channel 1.
I am playing from an external midi keyboard that goes to midi IN and then Midi OUT goes to the polaris. This is all routed through my DAW Logic X.
I can control the polaris on midi Channel 16 or Channel 1 and the individual sounds from the linked patch.
The issue is the Polaris will not play both the main and linked sound if I tell it to play on all channels, only one "instrument" plays from the Polaris. Subsequently if I create two "instruments" inside logic and tell the Polaris to play from midi Channel 16 on one and Channel 1 on the other. The Polaris defaults to one of the instruments only and does not play two instruments at once.