Yes this is how I understand it, but my question is about single component and not Simple Mode, from documentation there are 3 possibilities, kDistribute, kSimpleMode and single component. Simple mode means, they are separated (controller and processor), but it is not alowed use it in another machine. Single component I am writing about is one class with processor and controller as one “object” and controller and processor are not separated and thay can call functions directly between each others, therefore I am writing about “block audio” because it is single component, and when processor call function to GUI, it can block audio, but this is not main question, question is Why it is not recomended.