By any chance are you using the Soloist track for your tests? PG Music has assigned MIDI channel 8 as a default to the Soloist channel.

Every Band-in-a-Box track, except the audio track, has a default MIDI channel assignment. Press Ctrl + E to open Preferences and then select the Channels button on the top row to open the MIDI Channel Settings dialog window. Select the Harmony button and you'll discover four additional midi channels are in use. The only midi channel that does not have a default assignment is midi channel 1.

MIDI SuperTracks have several characteristics that differentiate them from the midi Band-in-a-Box normally creates for a song.

First midi SuperTracks are recorded midi phrases. The midi phrases are created from midi recordings of an instrument MIDI OUT while a session musician is playing the instrument. Regular Band-in-a-Box midi is created by a midi pattern generator.

Second PG Music associates a midi media player and a high quality, Hi-Q, midi instrument patch to each midi SuperTrack. The media player and patch is loaded at the same time as the midi SuperTrack. You don't have to select an instrument patch because PG Music already has.

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2020 Band-in-a-Box midi channel assignments. Ctrl+E > Channels > Harmony
Jim Fogle - 2025 BiaB (Build 1128) RB (Build 5) - Ultra+ PAK
DAWs: Cakewalk by BandLab (CbB) - 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