3DS sound settings: Surround vs Stereo

What’s the difference here? Is surround some sort of pro logic equivalent if I connect to surround sound speakers?

Or is it some sort of fake 3D audio? I usually play with headphones but I’m always confused about what the best setting is.

It’s virtual surround iirc, but sounds pretty decent with headphones. Some games sound a lot better with it on by ymmv.

Man I didn’t even know about this setting