Great to hear that you are working on improvements to the AudioProcessorValueTreeState.
Have you considered allowing the creation of customized parameter attachments? I have requested that earlier here: Please make AudioProcessorValueTreeState::Parameter public!
After all it basically only requires to move the Parameter and AttachedControlBase class definitions over to the header file. As far as I can see that wouldn’t even break any of the existing code.
Even small adjustments to the existing attachments are impossible to make due to the present access restrictions. (like the one discussed here: AudioProcessorValueTreeState::SliderAttachment and RightButtonDown)
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