I made an Audio Plugin from the Introjucer then added a few lines to add one slider and an AudioProcessorParameter called delay.
The strange thing is that when I add use addParameter in the constructor nothing is added. Clearly the Juce Demo Plugin is doing something extra that allows adding parameters. Perhaps I am not overiding a required method in Audio Processor? I have shared the source (link at bottom) for the project if anybody can help me and tell me why addParameter fails, it would be great.