I had a problem with mixdown (bounce to clips) of mono tracks to a stereo track with the left channel lower than the right.  Turned out to be some type of program problem that was fixed by rolling back to several 2016 versions where it was OK and then eventually reloading the current 2017 version and it was fixed. 
 
BUT, my panning law is and has always been set to the default "0dB center, sin/cos taper, constant power"

.

Anderton

synkrotron
So which pan law is everyone using and why?

Here's an article that tells what you need to know about pan laws, which pan law I've chosen, and why. I'm sure you'll find Figure 3 interesting, which shows how different panning laws affect signal level when panned to one side or in mono. 

Craig,
 
In the last paragraph of the article, you mentioned that you tend to record mono sources in mono... Seems to me I read a thread recently (sorry can't remember which one) where you talked about recording in stereo more often these days... has that changed since the article was written in 2014, or am I misunderstanding your recording technique...thx!

It's both, actually. I record voice and guitar in mono, but they typically end up being stereo tracks because of added signal processing.

Anderton
Here's an article that tells what you need to know about pan laws, which pan law I've chosen, and why. I'm sure you'll find Figure 3 interesting, which shows how different panning laws affect signal level when panned to one side or in mono. 

Good Day all, 
Great article and Fig 3, you say you personally prefer the -3 dB option, (not the Sonar 0dB sin/cos default), which I guess accounts for the acoustical +3 dB level, when doubling a mono sound source.
Im not sure Im clear on which one of the 2, -3 dB options, is your preferred, the sin/cos or the square root taper?
 
I guess bottom line is, if like me, you live and stay in Sonarville, in may not matter in that you may not want to change now what you've used on existing good mixes, or you would most likely need to remix/tweak pan/levels, but important to know/consider when bringing in visitors mixes done using a different pan law.
 
Looking at Figure 3, and in hind site, had I seen this, I would have probably chosen, or thought to choose instead of the default 0 dB sin/cos, the 0 dB balanced option, as shown on track 11, 12, as my default or better choice?. That is, so your actual level remains constant when panning and is controlled only by your fader level rather than both the pan and fader? (Albeit I may still not be fully understanding, the constant power aspect).
 
Cheers      
 

Anderton
Here's an article that tells what you need to know about pan laws, which pan law I've chosen, and why. I'm sure you'll find Figure 3 interesting, which shows how different panning laws affect signal level when panned to one side or in mono. 

Thank you Craig
 
I'm probably a bit long in the tooth now to take all that on board. Old dog, new tricks and all that.
 
I don't think it will bother me too much... I'm not a pro, never will be. In fact, for what I do, it's debatable whether I should even be using Sonar Platinum, when Artist would suffice.
 
I work solely on my own, nowadays, and only swap stems as either stereo or mono wave files for the infrequent collaborations. I will never be porting my projects over to another DAW. I do record audio, as either mono or stereo, depending on the source (I've got a couple of guitars, a modular synth and a couple of VA synths) but most of my work is done with VST instruments. The genre I am currently exploring is minimal/ambient I often let some of my VST effects take care of my panning needs (stereo delay for instance).
 
I saw the other topic about summing to mono to check the mix and I understand that we should ensure that a mix works in mono as well as stereo. But this is something else that I don't do. I always assume that my work is going to be listened to on headphones, mainly because of the genre and also because it is something I have been doing myself for many years, regardless of genre.
 
So, given all that, I don't think that panning law is something that I should worry too much about. BUT, I will certainly consider trying your default choice, just because you know what you are doing, and I certainly don't.
 
Cheers, and thanks again,
 
andy

Here is an excellent video example of using the various pan laws with audio results of using each Pan Law.
 
This was an eye opener    PAN LAW VIDEO

Great article.  By the way, I am quite surprised to learn that Sonar does NOT default to -3 center.

I added Craig's and Jesse G's links to the first post.

Im not sure its been mentioned but I believe a lot of high end studios use -4.5 as a pan law.
Its the split between -3 and -6.
It also happens to be what the old classic SSL consoles used to use as pan laws.