This is a compilation of sorts of the different MIDI maps and reference sources that users have shared here on the forum and that are probably no longer accessible to download. As I don’t recall who posted these, I am unable to accredit those who have been so generous in sharing their reference tools.
The files are either text or pdf:
@persist Is there a published document listing the midi mappings for the shipping kits? I would have expected to find that here: https://singularsound-publicly-downloadable.s3.us-east-2.amazonaws.com/manuals/BeatBuddy-MIDISettings-Firmware-v1.77.pdf (which is the most recent information posted on the product page).
I am not aware of any official SS document mapping the MIDI for the BeatBuddy default drum sets. As I used a digital audio workstation (DAW) more and more, I began to remember how the drums instruments were mapped (i.e., what’s present in which positions or what drum instruments were missing). It’s easier for me now to just use one or two kits for the sake of limited neural capacity and energy. 
The file I posted above was what I collected over time from the forum. There were probably many other (complete) MIDI maps but I think they disappeared after the great SS forum server crash of '17 
This seems like it would be something especially useful to end users and not a heavy lift to generate. To reiterate, the proper place for this is on the product page as opposed to searchable in the forums.
Perhaps something Singular Sound could tackle; maybe include their premium kits’ mapping as well.