Usually SONAR includes templates that have a Master bus defined. I am sure X3 did. When using a template that lacks a master bus either select one of the existing buses or create a new bus, right-click on the bus header and enable "Set as Default Bus"

 Once added all new tracks will have their output set to this bus. Existing tracks do not automatically pick up the bus.
 
BTW, next time consider creating a new thread. Usually a better idea than resurrecting an old unrelated thread.

If you DON'T use a template you MUST insert your own Master Buss on any new project.
 
Roue the output of it to your interface (the Red Master Fader buss) and route the output of all your other tracks or busses to the Master Buss

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