LM-VCO question: 33k on gate of FET?

[intellijel]

In the AS21C LM VCO the output of the Lm13700 based schmitt trigger (pin 9) has a 10k resistor to -15V (this is exactly like the app notes for the LM13700) to derive a voltage from the current.
Does this also act as the pull down resistor for the gate of the Jfet Q5?

Also my main question is why is there a 33K resistor from pin9 to the gate of Q5? This seems like a current limiting resistor but there should be no need for this since it is a FET (i.e. no current transferred)

I have seen this in a few other synth designs using FETs (e.g. part of sync circuits) where there is a series resistor to the gate of the FET being used and I am trying to understand why.