John, Here is an idea you can try. I would make a backup of the MGU song file before testing.

In Band-in-a-Box (BiaB) Press Ctrl + E to open preferences.
Select the RealDrums button on bottom row, far left.
1. Press "Clear" button to remove existing RealDrums
2. Select jazz brushes RealDrums. This forces that RealDrums selection for THIS song.

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Ctrl + E then RealDrums button. 1. = Clear existing RealDrum. 2. = Force specific RealDrum.

Jim Fogle - 2025 BiaB (Build 1128) RB (Build 5) - Ultra+ PAK
DAWs: Cakewalk Sonar - Standalone: Zoom MRS-8
Laptop: i3 Win 10, 8GB ram 500GB HDD
Desktop: i7 Win 11, 12GB ram 256GB SSD, 4 TB HDD
Music at: https://fogle622.wix.com/fogle622-audio-home