He is using the pedal only as a freeze and volume (of the frozen chords ) . I have the hog and pog. On the hog you have an enveloppe and a filter slider. Working especially on the enveloppe gets you that sound. Same on the pog as there is an attack filter that allows the same effect. (Sort of muffed and delayed attack)He is using it for a 'Hold' feature.
That thing tracks insanely well? I'm thinking maybe it's more Filter based, or a combination of level and filter?