JRiver's DSP Studio allows the pitch to be changed from A=440Hz to A=432Hz (or about anywhere else).
It's a percentage change. So, I set the pitch at A=432Hz (-2%) and left it there for awhile.
At first, I thought that I liked it there, but after awhile it became annoying.
Everything just sounded flat and "too slow."
The pitch adjustment is not supposed to affect tempo (per JR) but a lot of music sounded slow, to me.
So, I set it back to A=440Hz.
Perhaps some music - possibly classical and acoustic guitar (like the example posted here) - may benefit from the lower pitch tuning.
It's probably also a matter of brain programming.
If I always heard a symphony or piano tuned to A=432Hz, then A=440Hz would likely sound too fast/bright.
An interesting experiment. If you want me to try a certain piece of music, just ask.