I’ve had my MD SPS-1 MKII for a little while now.
Today was jamming with as usual, when suddenly track number 9 (CH) stopped responding. If I try edit the machine on that track, the button works normally, but when I exit the edit-menu, it totally stops responding; none of the leds respond either. Defect unit, or is there some solution you, the more experienced Elektronauts can think of?