My keyboard was a either wild chatbox or not working as expected like no note off messages !

Made some hardware fixes after opening the thing ( disconnections and such )
Still not great and certainly not lasting in the long run ( like : aftertouch either works or not, randomly ) but at least with this monitor I managed to find many workarounds and figure what's working.
The keyboard is kind of crippled now like many buttons have popped up and were replaced by direct action via the plastic tube from an air blower for direct and sure action !
