According to the table of contents, there is no mention that the harmonizer underwent significant changes in the 2024 Bootcamp video. I'm guessing that Bob is referring to the change from TC Helicon to the present Harmoniser (in 2018). That was a major change. Other than that, the only change I can recall is when the present Harmonizer gained the ability to be applied to all tracks in 2020/2021. As you say, though, Bob might provide some more information to help isolate the issue(s) he's experiencing.


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