To properly connect an external gate a trace needs to be cut and both ends wired to a switched jack. Heres the details. You can omit the buffer.
The glide cannot be used with anything other than the Werkstatt keys. What I did was just duplicate the glide circuit and wired it in line with the vco exp in. Then either wire the amount to another pot or replace the glide pot with a dual. There’s a part number in another thread for the pot.
You could cut the trace connecting the keyboard to the vco and wire it to either a toggle or a switched jack. Then you could route it’s voltage to other things without affecting the pitch.