?

Hi. I'm on tour with my CS-50 and one voice suddenly is stuck on Glissando (I can't switch it to portamento). I need to fix it fast before the next show...

I only have a meter and soldering iron (and limited knowledge and skills :) with me, so I'm hoping to just quickly swap in some new parts (can't do much testing).?

Is the issue likely to be the comparator IC (the 4069 inverter) in that part of the circuit (IC23), or is there something else I should target? Again, glissando works - so maybe the gate is stuck on?? I would like to try to make one stop or one order for parts before I attempt to do this, so it would be great to hear some of your guesses so I can get those parts before I go in.?

Thanks! DT