The pan laws in the mixer are fixed as also if you create a stereo buss, its pan law will also be -3 dB. The idea is you use
Dual Pan to change it in the areas needed. Might only be one or two.
One way to check how pan laws sound would be to either in a mix or in solo create an automated pan sequence over a cycle of bars e.g. 4 bars. Panning might start centre, travel left, hold, swing back through centre to the other side and maybe rest back to centre. The automation could be cut and pasted over a number of cycles. Then place a part onto that track. A sequence in electronic music for example would be ideal. The initial pan centre volume of the part must be set with the mix everything in. And not moving.
Set up
Dual Pan on the track and select different pan laws and maybe hear the variations in volume over the sequence cycle. Start by soloing the part and listen to the movement of it through the cycle carefully. Bring everything else back in and now listen. I bet with everything in, the pan laws might sound even more pronounced.
Some pan laws may cause the part to loose volume in the mix quickly as it moves from centre to its first destination e.g. left. How the volume of the part hangs in there from a full swing from left to right for example. Other laws will keep the part volume more audible over longer parts of the cycle. Some laws may even make the part too loud in some parts of the cycle too. Meaning then that the overall part level may need to be reset to suit the louder parts of the panning.
I love moving things around. In electronic music it is very powerful and fun thing to do. If you have got right speaker setup even live it can sound spectacular. Recently just got the Waves
Brauer Motion plugin which does all of this
(and a lot more like setting up two panning motions at once!! This is really something to hear) It can also create the illusion of the circular panning motion happening around your head. In a very sophicasted manner. I am sure the tonal response of the signal is also moving in a circular manner too.
There are some very cool plug-ins now that specialise in a lot of spacial movement. They all install and work perfectly inside Studio One of course. All their parameters can be easily automated. Studio One makes it painless to automate every single parameter of every plugin usually including mute on and off too. Mapping parameters to any of your controller devices is also painless as well.