VCO Build Help Needed

[1wildthing]

Hi all, I received an Hearn Morley HMVCO1 chip from a friend and I would like to build an Eurorack module with it. As I didn't find any commercial PCB based on this chip I was thinking to stripboard it staring from the schematics suggested by the producer.

schematic.png

As you can see from the attached image it's a basic schematic so I would like to add attenuators to PWM and FM INs and also add a Frequency/Coarse tune Pot to the CV In.
I'm a newbie so I have to be honest, I'm really confused on how to do it.
I have a few question and I hope that you guys can help me:

1) As for PWM attenuator may I just insert a 100k potentiometer between PWM IN socket and the chip or it's better to use a resistor after the pot?

2) as for FM attenuator, a 100k pot in between IN socket and 2n2 cap is expected to work or I need to rebuild the circuit?
3) Could you please give me some advice on how to build and connect the frequency pot to this circuit?
Any kind of hint is really appreciated.