what came next to use pd "inside" a vsthost was pdauto http://mamalala.de/xovo/pdauto.html with sending parameters over the tcpport, but this method causes a too high latency and the gui is visible just in some vsthosts i.e.
Hi Stefan, its true that this project has fallen into the deep sleep. I developed it for one project for which it was working ok, but then didn't need it again. It is message-based only and there's no way to adapt it for audio with acceptable latency and jitter. There has been some interest lately, though, and if someone wants to resurrect it, go ahead... the source code is still existent.
The most reasonable way is to adapt the PD audio engine as a VST client or write an object which does the same.
best greetings Thomas