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1) Notes are not consistently red on play back. The techies at BIAB are working on this and have been working on this for a long time.
That may still be because BiaB 2024 has added further processing demands and your processing power is inadequate to handle this. This issue does seem to be isolated to your own installation. I have no evidence to establish this though, it's just a hunch.

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2) When I open a song in notation mode it almost always has the melody instrument set to bass. I have to manually reset it.
The developers definitely made an unexpected change so that Bass track is now the default instrument. Did the online chat with PG Support advise you of this?
I don't recall that this change was ever requested. The developers have mentioned perhaps making the default track an optional setting. Yes, the default used to be the Melody track - until 2024.

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3) When I upload a rendered song to my youtube.com studio the sound is harsh and has a scratchy quality.
I'm not sure if this is related to the audio settings in the file that you upload to YouTube, or if YouTube has made some changes to file processing at their end. Did you see Noel's and Andrew's questions?


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