Sound between Bank

Now I"m lost.
I have a kit on bank A1, I copy this one to A2.
Then I need to change the A2 track 4 sound with another one.
Select it from the D+ and it also change to bank A1.
Tried to push both sound to pool but get the same result.
I’m expecting bank A1 to be different from A2 or i am missing something here ?

Never mind, I use the same kit instead of changing kit…
Learning, learning :wink: