Dave Robillard wrote: And what's the intention behind it? What do you intend to achieve with LV2? I mean, freedom is good, but predictable behaviour and maximum compatibility between implementations is one of the reasons behind standardisation, in my opinion. By "predictable behaviour" I mean predictable to non-technical end users, not just to developers. I don't know how many non-technical end users do you know, but you may bet that once you start describing feature sets in hosts and plugins they'll go "lalala I can't hear you" :) Also, notice that introducing those "levels" doesn't prevent custom/proprietary features in any way. Which is why my proposal is all but "heavy handed". The only thing it's "heavy handed" about is promoting implementation of basic infrastructure in hosts. Just like power socket standard is heavy handed about the voltage and physical layout/function of the pins. I think you should ask people with more experience about history of standards like DX, VST or Buzz - evolution, early bugs, what features did they offer and how they were used etc. Otherwise, you're doomed to repeat the same mistakes the authors of those standards had made. Which will possibly mean "death by arrogance" of the new standard. There's an old saying (I don't know who coined it) - "those who don't know Unix are doomed to reinvent it, poorly" - I think it's the same with all kinds of plugin APIs. Krzysztof