Simple question
Does Audacity use a pan law? Pro tools uses -3 dB pan law. Reaper u can choose between 0 and -6 dB. So I’m wondering if Audacity has one and what it would be. That way when I transfer files from Audacity to Reaper, it’ll sound identical.
Thanks
“Pan Law” refers to how much gain is applied when a sound is panned away from centre. The track Pan control in Audacity simply reduces the level in the channel that is being panned away from - that is, when you pan to the right, the left channel is reduced and the right channel remains the same. That could be described as a “0dB Pan Law”.
That way when I transfer files from Audacity to Reaper, it’ll sound identical.
Whatever you transfer will transfer as-is since you are transferring audio files, not “projects”. The two applications need to use the same pan law. I think people run into problems transferring projects between different DAWs. And, I assume that’s a nightmare anyway. 
Most of the time you pan first, then mix. That is, you pan/position the track and then adjust the level in the mix by ear. When you do that, the pan law is not important.
It can be important if you are actively moving sounds across the soundstage. Theoretically, you want a 3dB pan law for constant power as the sound moves. A 3dB change is a power factor of two, so if you have 10 Watts coming out of each speaker and you pan it fully to one side, you get 20W (+3dB) out of one side instead of 10W out of each side. (I seem to remember that that there’s something “unusual” about REAPER. Maybe the -3dB pan law “works differently” because all tracks in REAPER are stereo, or something like that…)