Has anyone noticed any weirdness about some of the demo recordings in the Style Picker? Clearly the wrong recording. For example, _JBRM_B.STY is written to include Acoustic Bass, with no MIDI instruments. In the instrument list, there are Ac.Bass, Drums. The recording clearly has Piano and a MIDI melody.

In _JBRF_B.STY:
All RealTracks. Quartet. Tempo=160 (150-220)
Instruments: Ac.Bass, Ac.Piano, El.Guitar, Drums
RD: JazzTerryClarke^02-a,b:Brushes :Terry Clarke
** N/A ** RT400: Bass, Acoustic, Jazz Ray Sw 160 , Jodi Proznick
** N/A ** RT449: Piano, Acoustic, Rhythm Jazz Sw 140 , Miles Black
** N/A ** RT446: Guitar, Electric, Rhythm Jazz Sw 140 , Oliver Gannon

There is clearly an organ playing melody in this demo recording, sounds like it may be MIDI, with a tone wheel mistake and maybe sustain pedal accident at the end. Horrifying.

Look at the list you provided.
N/A means likely you:
A) Didn't install packs containing these Real Tracks
B) Didn't buy the Real Tracks but have styles that use them.

_JBRM_B.STY and _JBRF_B.STY are playing the correct style, but they do have a MIDI soloist which is not something we've added to demos for a long time - these were rendered over 10 years ago, and there was clearly a problem with the MIDI rendering as there are stuck notes. We will revisit those and fix.

So, why would the demo recording sound completely different than the style? If I just apply the style to a new song, I only get the Drums and the Bass.