...this was the problem! I moved the joystick to a different position
and everything worked again.

I will try to clean it (should I use the dry or wet type of contact
cleaner?) but for now the problem (a patch for sequencing) is solved.

 

If it is like mine and I remember correctly........

    You should have a cone shaped hole with the stick in the center...

Inside under the casing there is a free moving plastic, rubber, or metal square plate (I forgot what it is made of). A hole is drilled in the center of it, and the 'stick' pokes through this center hole. It is to works as a 'splash-guard' or to try to keep garbage out of and away from the inside of the joystick.

    First: I'd go with the dry cleaning... take a vaccume and move the joystick all over while sucking any crumbs or hairs that might be floating on the pad/plate. See if it dose the trick?

    Second: Take a really bright light and slowly move the joystick around to see if there is any sticky pop/beer that may have split onto the plate (gumming it up). IF you find a spot or even if you don't, but you can feel it's a bit sluggish in areas, UNPLUG IT.... take a Q-tip with a small amount of rubbing alcohol on it. hold it in one spot so it makes contact with the plate ( put the Q-tip at 12:00 as if it was a clock dial), and move the stick all over the place.  Check the Q-tip to see how much gunk you have on it.  If it's dirty at all change Q-tips, move clock wise (about 5 min./ 1 hour spacing). and repeat until you get all the way back to the 12:00 mark. Remember to use small amounts of rubbing alcohol. You will end up over lapping the same 'areas of the plate' a lot if you move around the opening like I recommended in hourly intervals (if the joystick was a clock).  Wait a few hours, or If you don't like waiting take a hair dryer to it. But make sure you have not made it so wet as to cause the alcohol to run off the plate and drip onto the inside circuit board.  If you did use a lot, which I might be inclined to do myself... don't plug it back in for at least a day or two. (I don't want to recommend something and have you screw up your synth!!!). After a day or so give it a try and see if this fixes it!

   Third: While your waiting for it to dry USE IT... and play with it a lot!!!! UP/DOWN/Left/Right/ top corners/ bottom corners, in an 'X' pattern, and don't forget the ever fun 'Round-About' over and over for a long time... heheh sit and watch TV and just keep moving it around for an hour or so. IF it is carbon perhaps you can ware it off. If it dry and that's a no GO!