I’m working with attachments and I notice that when I connect a slider to an AudioParameter functions inside “AudioProcessorValueTreeState::Listener” are not called… is it right?
ListenerLists will call ALL added Listeners, so adding an additional Listener or Attachment (which is just a ParameterListener and SliderListener) will not block the execution of the SliderAttachment. There must be something else going on, but impossible to guess with that little information.
(*) replace Slider with Button/ComboBox/… it works the same for all Attachment classes
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You’re right… It was my mistake on other lines of code… The tiredness… 
Thank you for help… 