Is it a MIDI song, or at least are some of the tracks MIDI?
If so, there may be a Patch Change in the MIDI data.

You may be able to find it this way, especially making use of filters:

Attached Files (Click to download or enlarge) (Only available when you are logged in)
2022-01-12_11-42-12.jpg (174.16 KB, 94 downloads)

BIAB & RB2025 Win.(Audiophile), Sonar Platinum, Cakewalk by Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Kontakt, Focusrite 18i20, KetronSD2, NS40M Monitors, Pioneer Active Monitors, AKG K271 Studio H'phones