ok I've played with this for longer than I should have. It was a good exercize because now I see that the gx slowgear is a bit different than what the pog2 (I think) is doing.
The slowgear has a threshold and fades either in or out if the signal is above or below the threshold respectively. My best attempt is shared as the fakebass pedalboard. The pog2 I think just works dynamically so any rise in signal amplitude will make it lower the gain and slowly rase it back up, kind of an adaptive compressor thing. I'll think some more about it but I can see now that you'll never get the 2nd sample shared with the slowgear, and the 1st sample only if you play very cleanly and carefully.