You're right changing instruments alone does not change the MIDI notes. Instruments from different styles should play the same chords but have different MIDI notes or riff that plays over the different styles.

What may help is to use the 'Change Style at any Bar' feature.

Using the 'Change Style at any Bar' feature allows you to hear an instrument playing as it's programmed to perform in another style rather than the original style in your song chart so you should hear different riffs and not just hear a different instrument playing the same MIDI notes of the current style loaded into the Chord Sheet. It will still play the exact programmed chords, but the MIDI pattern should change. The downside is each track will be affected and not just a single track.

Access the Change Style at any Bar feature by Right Clicking on the Style Window on the main screen. This is the large window that displays the current loaded style. Change Style at any Bar is the second selection. Here you select specific bars to change the entire style. You can perform the function multiple times throughout the course of your song playing.

Other than opening the Style Picker to select the various different styles, the audition occurs from the main screen and the changes occur automatically. Play your song from start to finish will provide hearing the various instruments play over the chord progression of the current song, each, in their native style.

The result is the same as if you had selected 'Select custom MIDI Style for this track' except it loads the new style for each track and not just the single track. It's also the same as opening the StylePicker and selecting Styles from the list to Play over the current chord chart play option.

This methods does provide a way to browse (and listen) to styles for a specific track (ex: bass) while BIAB continues playing without pausing which is a small advantage over the others listed.

I really like your idea of having the ability to do this on a 'per instrument' rather than 'per Style' and that would be a great feature enhancement and different from any method I'm aware of. Maybe PG Music staff will look at your idea and program it into a future update.

BIAB 2025:RB 2025, Latest builds: Dell Optiplex 7040 Desktop; Windows-10-64 bit, Intel Core i7-6700 3.4GHz CPU and 16 GB Ram Memory.