You can only* map the preset trigger buttons (numbered 1-12) - which will trigger the presets on the current bank/page. *actually, there's a way to map some further buttons. On the MIDI window there are a bunch of controls labelled "B2 P1", "B2 P2", etc.... B = Bank, and P = Preset. So, you can actually assign 3 banks of presets to MIDI: the current (B1), the next (B2), and the one after that (B3). It also means that if you switch to another page, for example the 4th page of the presets, then B2 actually refers to the 5th page, and B3 refers to the 6th page. I hope that's not too confusing. It wasn't really an official feature, but just added so that certain users could access more of the presets via MIDI.