When I use the standard AudioProcessorValueTreeState, how can I add parameters that are represented by an extended AudioParameter class? I have a class called ModParamFloat that inherits from AudioProcessorParameter, and I would like to move from a simple XML save/load state to using AudioProcessorValueTreeState, but the only method I can find for adding parameters is createAndAddParameter. Is there no way to just add subclasses of AudioProcessorParameter to the value tree?
No, it wasn’t designed to allow you to do that. But maybe you could get the same result in a different way by getting a Value from the AudioProcessorValueTreeState and then using a custom Value::ValueSource to re-map the value’s range or behaviour somehow.