Maybe you will have to enable the Tablature, so go to Notation Window Click on Opt and on the new window check the Tab.

  In the Slow down per percentage tempo BiaB 2021 it's not fully compatible yet with DiaB because the audio and the midi goes out of sync, I'm in contact with PGmusic and they are working for an update!

                                           2020 BB and older versions works fine.'