To alter the Normal template (one method):
1. Open a new project, using the Normal template - does not matter what you call it.
2. Once open, go modify the metronome to be however you want it.
3. Click on File>Save As
4. Change the TYPE to Template
5. Change the NAME to Normal
6. In the SAVE IN up at the top, navigate to the folder where Sonar keeps the Project Templates. The default for this is within Cakewalk Content>SONAR X2 Producer>Project Templates
7. Confirm that you want to overwrite.
Now, whenever you create a new project using the normal template, your metronome will play disco duck, or however you set it up.
Hope that helps,
Bob Bone