Originally Posted by AudioTrack
I wonder if "Playable RealTracks" could assist?

From the help:
"This cool feature allows you to add MIDI notes (via the Piano Roll or Notation window) to the same track that is playing. And you will then hear that MIDI track playing, in most cases using a MIDI sound created from the RealTracks recording session. This means that you can get the track to play the notes you want at key parts of the performance, either augmenting or replacing what the RealTracks is playing, for the section you want to change."
Even though the _Thrash1.sty RT387 Bass RealTrack doesn't have RealChart data, Playable RealTracks work and can be used to edit Bar 2 to play the correct octave.

BIAB Ultra Pak+ 2024:RB 2024, Latest builds: Dell Optiplex 7040 Desktop; Windows-10-64 bit, Intel Core i7-6700 3.4GHz CPU and 16 GB Ram Memory.