Three thoughts:

1) If all you're wanting is to use midi drums and bass you can stay in Band-in-a-Box and will not need to use RealBand at all. But of course you can use RealBand if you want to. laugh

2) Why not use the Patches tab to select different drums and bass?

3) Why not keep that portion of the bass and drum tracks that you like and use midi drums and bass for the few measures you don't like? A few years ago PG Music released a video demonstrating this technique on a track with a ukulele instrument. Essentially you mute the drums and/or bass for whatever bars you don't want them to play. Then you use the piano roll view (PRV) to enter midi in the melody and/or solo tracks and assign midi drums or bass.

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