Actually just to make a correction, streaming vsti's use very little RAM, as they are streaming from audio samples on a drive...modelling vsti's on the other hand do not stream any sample data but run totally from RAM.

Now with the windows 32 bit restriction on ram to 3 gig MAX, even if you have 16 gig installed...this ram space gets eaten up VERY quickly with the OS, the programs running and the vsti's...hence the need for 64 bit and more available ram.

I am not bagging BIAB at all...I had specific purpose that needed a host to run 64 bit...

I can always just run midi out via LoopMidi into Cantabile as the VST host, but it would have been better all within BIAB as the patches can be saved along with the song...if it is an external host, one also has to jump from BIAB to the host to load a new soundset if needed...