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Why PG will not allow us to use latest version with this customizations???


???? I don't know, they might just want you to only drag consolidated wav files into Reaper to make it hard and frustrating rather than easy after 15 years.
They think they may have good ideas but they don't give it much thought and look to see how modern software works to make things easy for the user not hard and frustrating.

You have the BBPlugin that will hopefully be made to play/generate files direct soon but there are many users that want all the features and function of the main Biab app.
I have spent so many years showing PG how to make things much better but it's has been an incredibly slow process year in year out try to bring them into the modern age. There is so much resistance.