Hello izrax, thanks a lot, im glad you like Capsule !!
Actually the expression/sprite stays the same throughout the scene. To switch sprites between dialogues, you currently need to split into multiple scenes that chain together with "Auto Next Scene". Each scene can have a different characters configuration (different expression, position, or even remove a character entirely). Since transitions can be set to none, this feels seamless to the player.
However, that's a relevant idea, so I think I'll add the option to include a BBCode [expr:actorId:expression] in the dialogue to allow changing the expression within the same scene. This would help reduce the number of scenes. Excellent idea!
So in 2.0, in the same scene you will be able to make something like :
[expr:alice:happy]I found the key !
[expr:alice:sad]But at what price...
[expr:alice:angry]I will never forgive !