I think you are encoundering a well known MIDI dillema – is the first one 1 or 0 ? 

Since MIDI ranges between 0 and 127 (there cannot be a 128), the first MIDI value is 0. 

But, on our units, the first real preset is 1 (since zero confuses some people).

I say real, because we sometimes call temporary (unsaved) presets 0.

So, the first entry in the default MIDI map is 0:1.