Yes i did the 2, because i am spoiled for choice to try different CPU on different x0xb0x:
And i have 3 atmega with the same bug, tested on different x0x with different eeprom.
By continuing the tests, i noticed that if i start a pattern in EDIT mode, already recorded on the eeprom with other atmega, i can not modify the pattern, by cons i can make it play higher, or lower with keypads, like the pitch Mode of a TB303!
I asked a friend who knows a little bit about the programmers, apparently with a programmer, i can erase the sokkos and then load a new one, right? In this case, it is the solution of the problem i think. Excuse me, but as i said, the firmware, it's the x0x side that i know very little about.