Though the manual says the bass drum has different pitch, I-note and O-note values, I only see C1. It then says the i-note is A1 and later that the O-note is B0, though that is below the snip screen.

You seem to have a point. The screenshot does not seem to reflect what is written in the text.
The text can also lead to confusion because it talks about pitch, which is something you’re definitely not dealing with in most scenarios when you’re talking drum maps. Would’ve been easier to explain I-Note allows you to remap the layout of a drum map whilst retaining the original mapping in the plugin.