I have to admit your post just made me aware such an App and “standard” exists. “Pretty Cool”! However, I’m thinking it is not able to do what you want. It appears to be for things where their sound, etc. is generated by the iPad, etc.. I imagine it would be useful for the H9 Plug-ins that have been put out in the last few years. The H9 Control is only controlling the device that does all the work stand alone. I would think Eventide would have to program a dedicated AU app or “go between” for H9 Control. I’m not a programmer so I may be slightly off a bit, but I think I’m close.
