I have a TS-12 that now seems to have certain notes going out of tune. I notice it particularly in the lower registers of some of the piano samples because I double a lot of bass lines with the bass player. I know it's not always him because I checked the TS-12 notes on a tuner and some of them are definitely off. Has anybody else had this problem, and is there a cure? Also have some other problems that may need a tech, but there is nobody in this area that is willing to work on one. Does anybody know of a good Ensoniq tech anywhere in the U.S.?