Hi guys!. My Prophet 12 has a problem with the voices from 7 to 12. Some are low volume and some are muted. I tried to calibrate but the process stops at voice 9 and the keyboard is locked. I've updated the system, done the global reset, and nothing solves it. Is there a possibility that the voice chip may be damaged during an air transport using a very robust case? Has anyone ever experienced this? The most important ... is there a fix for this problem? Thank you.