Manual: {F15992}
May not be the manual for my revision per se, as setting reverb does not appear to be as mapped.
Other stuff:
* Old DOS/Win software: https://www.midimusicadventures.com/queststudios/mt32-resource/utilities/
I have a real one, but emulation is probably an easier time for most! Ex. https://github.com/dwhinham/mt32-pi