Thank you!
I'm at half way now, I presume :)
I assigned both delays to the same FS, it alternates them, everything is fine.
I kinda tripped at assigning the mix of both delays to the same expression controller.
I put a volume pedal after the amp and before the two delays in my chain, I guess it is corect, isn't it ?
Then I tried to assign the mix of each delay to the EXP2 but maybe I do something wrong on mix max and min because it still does not work properly. I will try again.
The problem I found is that only my EXP2 is active, I cannot assign anything on EXP1, the pedal does not do anything. Strange, only my EXP2 led is active while my EXP1 led is off forever, I cannot make it work.