Ok, so LXR is working well with SDHC cards in general? I thought it wasnt..
So my problems come from those hidden files?
(some of my kits didn't sound anymore after a while, and I haven't modified it)
This tip made me progress through my bug but it's not a solution for me..
see my post here
http://forum.sonic-potions.com/discussion/808/midi-through-routing-problems-#Item_1