Go To "Edit" > "Track" > "Make first 8 tracks BB tracks". That will set the first eight tracks as midi tracks and each of the first eight tracks will use a different midi channel.

Press Ctrl + F5 to open the "Preferences" window > "MIDI" > "MIDI Devices". What are the settings?

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RealBand MIDI Devices Screen

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