Hello Sophie

> I need to replace the MG1 knob, do you know which potentiometer I should get?
> Also, is there something I should be extra careful about when replacing it (I
am a beginner at opening synths)?
Do you need to replace the knob (the plastic thing, which sticks on the
the potentiometer) or the potentiometer itself? If it is the
potentiometer then: what is the failure with it? Usually cleaning the
potentiometer solves the most problems.

If you really have to replace the potentiometer: it is a 10kOhm
logarithmic potentiometer. Basically it is a potentiometer from the
company ALPS, which is still available, but unfortunately you won't get
the exact model with the mounting stands. You may try to find a similar
potentiometer without the stands, and then put the inards of the new
potentiometer into the housing of the old one.

Kind regards, Florian