From: Paul Davis <paul(a)linuxaudiosystems.com> must be supported by GMPI. Not critical, in fact VST has removed this feature. Possible future enhancement. haven't followed VST carefully, and you certainly know more about it than me, but i thought that steinberg did the opposite and got rid of process_adding() and process_replacing() and required process_replacing() ("in place") semantics? Good point. In-place is super-easy to support anyhow, just use the same buffer as both input and output. Jeff