Good point. Deleting that did fix the issue of stuttering, and now if the plugin is loaded in the host the audio is still clean. But still when I try and pass audio through the plugin directly there’s no sound out.
I printed out some examples of xn and yn in the debugging log, and was not able to get a sample of yn greater than 0.002f. Maybe I’m not using processAudioSample() properly.
UPDATE tried swapping out my WDFTunableButterLPF3 objects with the very similar WDFButterLPF3 class and that runs fine, so it’s definitely an issue with the class.