Here are my results after downloading and loading the MGU file.

All tracks are frozen. That's good news.

Melody, Soloist and THRU are MIDI.

Melody is assigned MIDI channel 4 with harmonies on MIDI channels 11 and 12. Melody has 336 notes.

Soloist is assigned MIDI channel 8. There are no harmony assignments. The Soloist track has no MIDI events.

THRU is assigned MIDI channel 5 with harmonies on MIDI channels 13 and 14. The THRU track has no MIDI events.

All three tracks have Harmony = 5 Piano (Double Octaves) assigned as a patch.

Repeat: Soloist and THRU have no MIDI events.

When I generate a play there is audio on the Melody track but no audio on Soloist or THRU.

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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