https://www.cakewalk.com/Documentation?product=SONAR&language=3&help=Mixing.14.html#1750602
This works.
 

paganini1840
HI 
 
The way to do that is simple
First create a Metronome track in the BUS section
go to preference and use audio metronome and assign the output to your Metronome BUS
in the Metronome BUS insert an new AUX
create a new new track and choose AUX 1 in your Input put it on RECORD et Voila !
 
Pierre

You sir... are a genius. Thank you
I'm reading a lot of different ideas here and this one worked. I appreciate the input.
I don't see it so  much as "causing confusion" but another good idea or approach. 
 Maybe mark this post as answered? Or remove the ones that aren't relevant. The CAL SCRIPTS/// now that was confusing
lol
I am still looking for a way to just record the click on mixdown though. The documentation only describes recording metronome to an audio track. Waste of time

I've gone slightly bonkers trying to implement the suggestions in this thread until I realized as a Home Studio user I don't have access to features like adding Aux buses.
 
Routing the metronome to the Master bus doesn't work. The metronome is always muted during exports.
 
Exasperated, I resorted to a "low tech" solution you might say.
 
I just looped-back one output of my Fast Track Duo to an input of the Fast Track using a 1/4" cable, added a new audio track, armed it for record, and hit record with the metronome set to play on record with everything else muted. This recorded the metronome onto my new audio track. 
 
I mean, it worked. 
 
Btw, the only reason I wanted to do this is because the metronome shaker is superior in sound IMO to the TTS-1 shaker!