Minimoog Model D one sound issue

[fanwander]

If the OSC3 control is "off"

Minimoog plays the same note at all keys

That ism what "Control off" does mean. It is normal.
I assume, that the glide potentiometer is broken

 

[Stanley-Sequencer]

if the Glide button is off, is glide potentiometer somehow effected or better to say involved in circuit?

in my case: if the glide is "on" it works perfect between 2 and last position on the Glide potentiometer if I go under 2 position or the glide is "off" the problem which I described earlier exists.