First I have to say that English is not my language, maybe the reason why I didn't find the answer.
So for the moment, to change patch I use a controller object like this:
It's working but each time I change a patch I have to switch to Card reader an rename the patch.bin to copy it at root of SD card.
Maybe now there is a better way. It would be great to load patches in their respective directory.
Is it possible?