I have the Intellijel Shapeshifter and it's pretty amazing. Works perfectly with the CV on the Pro 2. Although, be aware the pitch cv doesn't track properly until you make the proper adjustments to the P2 output voltage settings.
I have to say the Pro 2 really disappoints on the wavetable front which is the reason I got the SS in the first place. It sounds amazing and goes very deep. If you want something less complicated I'd recommend Piston Honda. I don't have much experience with it but a friend of mine has it and it's more straight forward than SS and it sounds good. Hope that helps.