The PD is set up in 16 banks. Each bank is a set of contiguous MIDI note numbers i.e. Bank 4 = C1 → D#2, Bank 5 = E2 → G3 (I think this is mapped to GA1 correctly, but I only use PD in FKey mode)
These should actually align with GA1 assignments, but you will have to switch banks for the kit pages. To switch banks on the PD, hold shift + Pad. Bottom left is Pad 1, top right is Pad 16.
Bank 1 = GM configuration
Bank 16 = FKey functions