Actually I don't even get the charts within the notation window of BIAB
Just to address the original poster's issue, it doesn't seem like you have the drum notation files at all. I would suggest that you look in one of the Drum folders like SurfRockDoubleTwo^ and see if you actually see an .SGU file in there. If not, that would explain why you don't see the drum notation. I would expect the Band-in-a-Box patch to fix that issue, as long as you select your correct Drums folder in the installer. Also, I see that there may be a bug with Drum notation not appearing in saved frozen tracks, and perhaps this is what the problem is.
Basically nonsensical rubbish.
Now let's talk about this issue, since so far I cannot duplicate this situation. I'll explain one test I did, and maybe you could do the same and see if your results are the same...
1. Loaded _HANGTEN and created a 12 bar song, which has part markers (so, drums fills) every 4 bars, plus an ending. The .MGU is in this zip if interested:
https://nn.pgmusic.com/pgfiles/support/misc/dn/_HANGTEN_drumnotation_test.zip2. Rendered this song to audio. Here is the audio file:
https://nn.pgmusic.com/pgfiles/support/misc/dn/_HANGTEN_BIAB.m4aAnd with ONLY drums:
https://nn.pgmusic.com/pgfiles/support/misc/dn/_HANGTEN_BIAB_drums_only.m4a3. Dragged Drums track to .MID section of drop station. Opened RealBand, dragged from .MID to the Tracks window.
Taking a look at the event list I notice a couple of things - one is that the individual notes should ideally all be on channel 10. I addressed this by selecting the track (ctrl+A), and going to the Edit menu | MIDI | Rechannel...
Also, the velocities of the notes were saved correctly from Band-in-a-Box, however they tend to be relatively quiet. I fixed this by Edit | MIDI | Change Velocities (increased by a couple hundred percent).
Durations of most drum notes is zero (although for some reason there are some that have a non-zero length). Drum note duration is a little different to think about than with other instruments. If you have a drum hit that has a note off a few milliseconds after the note on, you should still hear the hit fully. The duration is more like the length of time the drum stick is in contact with the drum. Maybe there are some differences in how DAWs interpret this. In any case, just for consistency, I edited the note durations in the event list so that they were all 0.
The resulting RealBand .SEQ file is in the zip above, as well as the edited MIDI file, and raw un-edited MIDI track.
4. Rendered this MIDI track to audio, played using the CoyoteWT DXi synth. Here is the result:
https://nn.pgmusic.com/pgfiles/support/misc/dn/_Hangten_RB_drums_only_edited_render_MIDI_CoyoteWT.wmaTo me, the MIDI notes look to be correct, and sound correct (though still a bit too quiet), but apparently there is some situation that people have encountered where this isn't the case, and I would be interested to know what it is...