For the moment, could you please turn off the track naming feature that automatically names tracks based on the instrument loaded. This will make it much easier for us to synchronise understanding.
To do this, go to "Options | Preferences" and remove the checkmark from the option for 'Auto-generate track labels' (as shown on the image below). This will cause BIAB to display its original static names. I anticipate with this feature off, what you call the 'Trombone' track is either the Melody or Soloist track.
When you load a MIDI file, BIAB will put all the midi parts on either the Melody or Soloist track and then mute the style. Thus, when you play a midi file, you are hearing MIDI entirely.
When you activate the style and then start looking for backing tracks, BIAB will also play whatever style is loaded along with the MIDI file. This could easily cause a collision of sounds that will sound very unmusical.
To get the best effect from a MIDI file, it's usually better to simply load in the song's Melody from the MIDI and then investigate backings. To load in the melody, it's necessary to know which MIDI channel it is on. Then, using the green SEQ (Sequencer) button, open the MIDI file and load just that melody.
Working with MIDI files in BIAB is one of the more advanced aspects of the program.
If you have the Windows version of BIAB, I encourage you to start Realband and to open your MIDI in Realband. It becomes very easy to mute tracks and to add BIAB tracks in Realband. Most importantly, though, in Realband, you can see each track of the MIDI file.
The 'green' drums that you mention are Realdrums and they won't overwrite MIDI drums. As far as I'm aware, if there are MIDI drums on the Drums track, the Realdrums will simply sit on top of them and mute any MIDI on the Drums track. In your case, though, I suspect that your MIDI drums are on the Melody or Soloist track since you loaded a MIDI file. This can be tested simply by using Mute.
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