Yellow Circle

Playing one buff, then using encore, and then playing the other buff creates a yellow circle.

But I thought FC doesn't stack no more?

red+green = yellow...?

Probably just a leftover from the first version, like the circle. We don't need a visual representation of range, other skills don't have them, and standing on the circle after the buff does nothing anymore.

Not sure if the effects stack, but the visuals persist and will blend together if the character hasn't moved. Additive color blending of red and green results in yellow, as ベリサ・マイルスター mentioned.

The effects can stack. Considering Sorrow doesn't effect allies and Life doesn't affect enemies, the effects can happen simultaneously with an Encore use. Multiple ones will use the most recent one if the circles overlap. You can, however, change the buff by entering different circles of Life (i.e. entering a Rank E one then moving over into a Rank 1).

Also it becomes active when you actually run inside the circle, and same can be said for enemies when using Sorrow.

More observations to follow.

I'm really confused. Everyone is saying they do not stack.

Was it possible to stack Battlefield Overture and Enduring Melody before the nerf or something?

Yes. before the nerf, the buff you used to apply the circle was tied to the circle as well. So if you cast a Sorrow with a battlefield, then the circle would give both buffs. (er, buff and debuff) as well as you could stack those with another linked buff using life circle.

So you could have Battlefield, Enduring and Hymn of life at once, as well as monster debuff.

I noticed my recovery increased after I stepped inside a Life Anthem. Enduring+Life kinda made my stamina raise wickedly fast. Multiple Life ANthems do not stack. Music Buffs and Lief anthem do. I'm not sure what's not to understand o-o...music buffs never stack anyways.