This is actually very easy to accomplish in Realband.

1) Open your BIAB song in Realband (RB) and it will generate.

2) Turn on "Snap to grid". (#1 on the image)

3) On the Drum Track's wave file display, select the bar before the part marker. (#2)

4) Right-click and select "Generate" from the right-click menu. (#3)

5) Select the Realdrum for the new style. (#4)

Realband will partially generate the chosen drums for the selected bar. You made need to do three or four regenerations (steps 4) and 5): NOTE... the Realdrum will be added to the Generate Realdrums (favorites) menu [#5] after the first selection to make it easier to reselect.)

If you still don't get a fill that suits, try selecting two bars (one bar on either side of the part marker).

I've just tried it and it worked fine for me. Realband allows Realdrums to be partially generated. As far as I'm aware, and I could be wrong, BIAB does not allow partial regeneration of Realdrums yet.

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Audiophile BIAB 2026