TwangGuru
I do primarily studio audio recording and it's just a minor irritation to have to go to Preference/Project/Metronome each time to uncheck "record".
I have been caught many times by the metronome being set on by default (annoying!). One solution is to modify the default templates, or whichever one/s you use when creating new projects, to have the metronome off by default. I'd just change it in the Control Bar.
Open the template in Sonar (templates are normally in "Cakewalk Content\SONAR Platinum\Project Templates" and you may have to set the file type to "Cakewalk Template" to see the ones that are there), edit to your liking, then save.
Thanks for reminding me to do something I've been meaning to do for quite some time.