Thank you for your help
I used it without midi to test, also I never used the wrong power supply, I labelled it with color tapes to avoid errors. I already did some user errors at the beginning erasing my stuff, etc…but I am quite sure that now the problem doesn’t comes from me. The cracks is really like when you have broken phones or speakers. If I save the whole project on sysex and doing a factory reset, will I be able to recall my kits and my patterns?