If you're creating a new song file in Band-in-a-Box the MIDI channel settings will follow the channel settings in the MIDI Settings window, Preferences (Ctrl+E) > Channels.

However, if you import a MID file and the MID file has MIDI channel assignments then the MID file assignments over rides the program defaults.

Attached Files (Click to download or enlarge) (Only available when you are logged in)
Clipboard34 MIDI Settings.jpg (41.74 KB, 120 downloads)
MIDI Settings Window - MIDI Channel Settings highlighted.

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