Yeah something liket this is what i need. Though, it would be most useful if it was possible to do on the fly without the need of the rig manager. I agree that the lock-functunality could be abit too complicated, and I like your idea of a batch edit option. Do you think it would be too complicated to have the batch-edit mode in the kemper interface?
Like, say you are in performance mode, you enter the "edit" meny, and besides the "arrange" button, there is a "batch edit" button. While in this mode, everything you tweak in say slot 1 of a performance also changes the co-responding rigs in the same slot in other performances. This way you can start sorting your performances based on what you want to change. So say slot 1 always is for rythm and slot 2 always is for solo, 3 for clean etc.
Then you can watch the performance mode more like a grid. With rows and columns connected in a way.
Hope it makes sense! Just brainstorming aswell